cas 584-84-9, Tolylene-2,4-diisocyanate | Articles data

Articles about 584-84-9Total 65 be found

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METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE
The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below: (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and(2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.
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(2021/06/22)

ISOCYANATE PRODUCTION METHOD
An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.
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Paragraph 0447-0450; 0459; 0478

(2020/05/02)

Synthesis and antitussive activity of obtucarbamate A derivatives
Obtucarbamate A was purified from Disporum cantoniense with good antitussive property. In present work, a series of obtucarbamate A derivatives were designed and synthesized from obtucarbamate A by microwave method, and their antitussive activity were evaluated. The results showed that the toluene diisocyanate was obtained with a yield of 95.1percent using a simple method, 1-methyl-2-pyrrolidinone as solvent, temperature of 190 °C, microwave irradiation at 60 W power for 30 min. All compounds have good antitussive activity, and small steric hindrance unsaturated groups of ester chains and amino groups favor activity. It is the first reported of obtucarbamate A derivatives used as antitussive, and the results provide a basis for the application of obtucarbamate derivatives as new antitussive.
Gan, Xiuhai,Liang, Zhiyuan,Ma, Xiaoyun,Wei, Gang,Zhou, Qingdi
supporting information

(2020/06/01)

METHOD FOR PRODUCING ISOCYANATES
The invention relates to a method for producing an isocyanate, wherein a carbamate or thiolcarbomate is converted, in the presence of a catalyst, with separation of an alcohol or thioalcohol, at a temperature of at least 150° C., to the corresponding isocyanate, wherein a compound of the general formula (X)(Y)(Z—H) is used as a catalyst, in particular characterized in that the compound has both a proton donor function and a proton acceptor function. In the catalysts according to the invention, a separable proton is bound to a heteroatom, which is more electronegative than carbon. Said heteroatom is either identical to Z or a component thereof. In the catalysts according to the invention, there is additionally a proton acceptor function which is either identical to X or a component thereof. According to the invention, the proton donator and proton acceptor function are connected to each other by the bridge Y.
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Paragraph 0133; 0134

(2020/12/04)

Heterogeneous catalyst for the direct carbonylation of nitro aromatic compounds to isocyanates
A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula AxBy wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.
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Paragraph 0233-0244; 0246; 0247

(2020/04/01)

Preparing method of toluene diisocynate
The invention relates to a preparing method of toluene diisocynate. The method includes the steps of adding a catalyst (polyoxometallate) and a solvent into a reaction container, then adding the raw material (2,6-diaminotoluene), phenylsilane, an acid-binding agent and a dehydrating agent to be evenly mixed, finally adding gas-state carbon dioxide, and conducting magnetic stirring and sufficient reacting at a certain temperature to obtain a product. In the method, Anderson type heteropolyacid serves as the catalyst, the catalyst requires mild reaction conditions and is high in specific selectivity, recyclable and friendly to the environment, the industrial reaction cleanliness is improved, the process economy is improved, manufacturing cost and three wastes are reduced, environmental protection pressure is relieved, and industrial production is facilitated.
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Paragraph 0027; 0028; 0029; 003; 0031; 0032; 0033-0063

(2019/10/01)

MULTISTEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE, PENTAMETHYLENE DIISOCYANATE OR TOLUENE DIISOCYANATE
The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes into diurethanes of high boiling hydroxy compounds, and finally cleavage of the latter diurethanes to form the diisocyanates and recover the high boiling hydroxy compounds.
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Page/Page column 12-13

(2019/04/26)

Reaction method accompanied by production of gas component
The present invention relates to a reaction method comprising a step of supplying a liquid containing at least one raw material compound and a low-boiling compound having a standard boiling point lower than a standard boiling point of the raw material compound to a flow channel, a step of heating the liquid to produce a liquid reaction product and a gas component by a reaction of the raw material compound, and a step of separating a liquid phase containing the reaction product from a gas phase containing the gas component and the low-boiling compound.
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Page/Page column 19

(2018/11/23)

Fluoride-Catalyzed Deblocking: A Route to Polymeric Urethanes
We report a fluoride-catalyzed deblocking of urethanes as “blocked” isocyanates. Organic and inorganic sources of fluoride ion proved effective for deblocking urethanes and for converting polyurethanes to small molecules. Distinct from conventional deblocking chemistry involving organometallic compounds and high temperatures, the method we describe is metal-free and operates at or slightly above room temperature. The use of fluorescent blocking agents enabled visual and spectroscopic monitoring of blocking/deblocking reactions, and the selected conditions proved applicable to urethanes containing a variety of blocking groups. The method additionally enabled a one pot deblocking and polymerization with α,ω-diols. Overall, this deblocking/polymerization strategy offers a convenient and efficient solution to problems that have limited the breadth of applications of polyurethane chemistry.
Sheri, Madhu,Choudhary, Umesh,Grandhee, Sunitha,Emrick, Todd
supporting information
p. 4599 - 4602
(2018/03/28)

Method for operating a gas-phase phosgenation plant
This invention relates to a process for operating a gas phase phosgenation plant (100) to form an isocyanate (4) by reacting an amine (2) with phosgene (1), in which the gas phase phosgenation plant is started up by first charging the plant with phosgene. At the same time as, or after the first charge of phosgene, the amine supply devices are rendered inert using a hot inert gas stream (30). Then, amine is admixed for the first time. In this way and by maintaining a pressure drop in the amine and phosgene devices to the mixing zone, the back mixing of phosgene into the amine-containing reactant stream during start-up is prevented.
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Page/Page column 14

(2018/01/21)

A urea french ion liquid catalysis method for preparing toluene diisocyanate
The invention provides application of an ionic liquid in preparing toluene diisocynate and a method for preparing the toluene diisocynate from urea under the catalysis of the ionic liquid. The method is used for preparing the toluene diisocynate by taking toluenediamine and urea as the raw materials, reacting the raw materials to generate toluene diurea under the catalytic action of the ionic liquid and then pyrolyzing the toluene diurea. The method does not need highly toxic phosgene and an extra solvent; the ionic liquid is adopted as a catalyst; on one hand, the ionic liquid is good in catalytic effect, easy to remove and environment-friendly, and on the other hand, a metal catalyst in the prior art is not used, so that the reaction of the method for preparing the toluene diisocynate from urea under the catalysis of the ionic liquid does not require harsh device materials and operating conditions, consequently, the production cost is greatly reduced, and the method is advantageous to industrial application.
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Paragraph 0036

(2016/11/14)

A method of synthesizing diisocyanate
The invention discloses a method for synthesizing diisocyanate. The method for synthesizing diisocyanate comprises the following steps: (1) dissolving diamine into an organic solvent to form a diamine organic solution; (2) adding biuret and a catalyst into the diamine organic solution formed in the step (1) to form reaction mixed liquor; (3) putting the reaction mixed liquor in an inert gaseous environment, reacting at the temperature 120-180 DEG C and the pressure of 0.7-2.0MPa for 0.5 hour at least, so as to obtain reactants; (4) filtering the reactants obtained in the step (3) to obtain a filter cake and filtrate; and (5) rectifying the filtrate obtained in the step (4), so that diisocyanate is obtained. The method for synthesizing the diisocyanate has the advantages that the diamine and the biuret directly react in the presence of a complex metal oxide catalyst to generate diisocyanate, reaction steps are simple, operation is easy, reaction conditions are mild, and yield of the diisocyanate is high.
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Paragraph 0081-0082

(2017/02/24)

PROCESS FOR PREPARING ISOCYANATE COMPOUND
The present invention relates to a process for the preparation of an isocyanate compound comprising the steps of: a) Reacting an amine compound A having at least one primary amino group with CO2 and an organotin compound S having at least one radical OR3 attached to the tin atom of the organotin compound, wherein R3 is a C-bound organic radical having from 1 to 30 carbon atoms, wherein 1, 2 or 3 carbon atoms may be replaced by oxygen or nitrogen, to convert at least one of the primary amino groups in the amine compound A into a carbamate group, thereby obtaining a carbamate compound C; b) cleavage of the carbamate groups in the carbamate compound C obtained in step a) to form the isocyanate compound and an alcohol R3OH, without separation of the tin compound formed in step a); c) obtaining the isocyanate compound from the reaction mixture of step b).
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Page/Page column 24; 25

(2016/11/21)

A continuous preparation toluene diisocyanate device and process
The invention belongs to the technical field of toluene diisocyanate production and discloses a device and technology for continuous preparation of toluene diisocyanate. The device and technology solves the problem that the existing toluene diisocyanate production technology has large difference of a material volume flow ratio, poor reaction selectivity, a low conversion rate and can cause reaction device fault. The device comprises a cold reactor and a heat reactor. The cold reactor comprises an unlimited impinging stream structure and a hypergravity structure. The unlimited impinging stream structure comprises a main material feeding pipe and a sleeve pipe, and the pipes have different diameters. The technology comprises that a phosgene inert solvent and a toluenediamine inert solvent solution are oppositely collided by the unlimited impinging stream structure so that macroscopic mixing and preliminary microscopic mixing are fast finished, and the mixture is fed into a rotating filler, stays for some time, then is fed into the heat reactor and undergoes a reaction to produce a toluene diisocyanate TDI crude product. The device and technology realize basically complete toluene diisocyanate reaction, prevent urea substance generation, effectively prevent pipe and reactor blocking and improve toluene diisocyanate production efficiency.
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Paragraph 0073; 0074; 0075; 0076; 077

(2017/04/11)

Syntheses of isocyanates via amines and carbonyl fluoride
Isocyanates are widely used in many different areas, but the most common synthesis route-phosgene route cannot fit the more and more rigorous restriction of safety and environment. Here, a facile synthesis method of isocyanates via amines and carbonyl fluoride is proven feasibly by expanding its applications to the syntheses of nine different isocyanates. And two differences with the phosgene route are proposed. The reaction could occur under milder conditions and afford isocyanates in good yields, especially for the isocyanates containing electron withdrawing groups. It is appealing for industrial application.
Quan, Hengdao,Zhang, Ni,Zhou, Xiaomeng,Qian, Hua,Sekiya, Akira
supporting information
p. 26 - 30
(2015/06/08)

Study on the synthesis of toluene-2,4-diisocyanate via amine and carbonyl fluoride
Abstract We presented recently a synthesis of toluene-2,4-diisocyanate (TDI) as one of the nine examples to verify the feasibility of an industrial appealing two-step method for isocyanates synthesis via amines and carbonyl fluoride (COF2). Because more investigation was considered to be necessary for future industrial application, the two-step synthesis processes of TDI were studied in detail herein. The total yield of TDI increased 5.6% under the optimized experimental conditions. The influence of the excess COF2 left in the reaction system was studied carefully according to a one-pot method.
Zhang, Ni,Zhou, Xiaomeng,Quan, Hengdao,Sekiya, Akira
p. 208 - 213
(2015/08/24)

Using carbon dioxide diarylbutadiene isocyanate production method (by machine translation)
PROBLEM TO BE SOLVED: To provide a method in which there are not various problems shown in a prior art when isocyanate is manufactured without using phosgene, and that can stably manufacture isocyanate for the long period of time in good yield. SOLUTION: The manufacturing method of isocyanate includes: a process in which diaryl carbonate and an amine compound are made to react in the presence of an aromatic hydroxy compound as a reaction solvent, thereby a reaction mixture that includes carbamic acid aryl having an aryl group originated from diaryl carbonate, an aromatic hydroxy compound originated from diaryl carbonate, and diaryl carbonate is obtained; a process in which the reaction mixture is transported to a thermal cracking reactor; and a process in which the carbamic acid aryl is subjected to a thermal decomposition reaction to obtain isocyanate, wherein a reactor in which the reaction of diaryl carbonate and an amine compound is performed and a thermal cracking reactor of carbamic acid aryl are different. COPYRIGHT: (C)2013,JPO&INPIT
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Paragraph 0129

(2017/01/02)

METHOD FOR PRODUCING TOLUENEDICARBAMATE, METHOD FOR PRODUCING TOLUENEDIISOCYANATE, AND TOLUENEDICARBAMATE
A method for producing toluenedicarbamate includes a carbamate production process of producing toluenedicarbamate by reaction between toluenediamine, urea, and/or N-unsubstituted carbamic acid ester, and alcohol; and a benzoyleneurea reduction process of reducing a disubstituted benzoyleneurea and a derivative thereof to 10 mol or less relative to 100 mol of toluenedicarbamate, wherein the disubstituted benzoyleneurea is represented by formula (1) below and has a methyl group and an amino group:
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Paragraph 0221-0224

(2013/05/09)

METHOD FOR TREATMENT OF ISOCYANATE RESIDUE, AND METHOD FOR TREATMENT OF CARBONATE
A method for treating an isocyanate residue, which comprises carrying out a thermal decomposition reaction of a carbamate that is produced by the reaction among an amine, urea and/or an N-unsubstituted carbamic acid ester and an alcohol to produce a decomposition solution, separating an isocyanate and the alcohol from the decomposition solution to produce the isocyanate residue, and bringing the isocyanate residue into contact with high-pressure/high-temperature water to decompose the isocyanate residue into an amine; and a method for treating a carbonate, which comprises bringing the carbonate into contact with high-pressure/high-temperature water to decompose the carbonate into an alcohol.
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Page/Page column 24

(2012/11/07)

PROCESS FOR PREPARING ISOCYANATES
The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of an inert medium, in which the amine and the phosgene are first mixed and converted to the isocyanate in a reactor, and in which a reaction gas which comprises isocyanate and hydrogen chloride and leaves the reactor is cooled in a quench space of a quench by adding a quench medium. The quench medium on addition to the quench space has a temperature above the condensation temperature or the desublimation temperature of the reaction gas.
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Page/Page column 3-4

(2012/02/01)

PROCESS FOR THE PREPARATION OF ISOCYANATES
An isocyanate is produced by reacting an amine with a stoichiometric excess of phosgene in the gas phase. This reaction is carried out at a temperature above the amine's boiling point to obtain a liquid stream containing the isocyanate and a gas stream containing hydrogen chloride and phosgene. The gas stream containing hydrogen chloride and phosgene thus produced is separated into a gas stream containing hydrogen chloride and a liquid stream containing phosgene. At least part of the liquid stream containing phosgene is then converted to a gas stream containing phosgene which gas stream is then recycled. The gaseous phosgene stream is maintained at a higher pressure than the liquid phosgene stream.
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Page/Page column 11

(2012/05/21)

PROCESS FOR PREPARING ISOCYANATES BY THERMALLY CLEAVING CARBAMATES
A process is proposed for preparing isocyanates by thermally cleaving carbamates to obtain a carbamate cleavage gas comprising the corresponding isocyanate and the corresponding alcohol, which comprises quenching the carbamate cleavage gas in the presence of an ether which functions as an inhibitor for the reverse reaction of the isocyanate with the alcohol.
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Page/Page column 3

(2012/10/08)

METHOD FOR PREPARING ISOCYANATES BY LIQUID-PHASE THERMAL CRACKING
The present invention discloses a method for preparing isocyanates by liquid-phase catalytic thermal cracking. In this method, in a reaction-rectification thermal cracking reactor, using a catalyst composition comprising a superfine powder metal oxide catalyst and an ionic liquid, an alkyl or aryl dialkylurethane, or multialkylurethane being a reactant is liquid-phase thermal cracked for a reaction time of 0.5-3 h under a reaction temperature of 160-220° C. and an absolute pressure of 1000-8000 Pa so as to prepare the corresponding isocyanate. The invention has the characteristics of low thermal cracking temperature, high yield of target products, relatively simple reaction apparatus and good universality for substrates (the yields of HDI, MDI, TDI, HMDI, NDI and IPDI or the like are all >85%) and the like.
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Page/Page column 5-6

(2011/02/18)

PROCESS FOR THE PREPARATION OF N-SUBSTITUTED CARBAMIC ACID ESTER AND PROCESS FOR THE PREPARATION OF ISOCYANATE USING THE N-SUBSTITUTED CARBAMIC ACID ESTER
The present invention provides a method for producing N-substituted carbamic acid-O-aryl ester derived from a compound having an ureido group, the method comprising the step of carrying out esterification or esterification and transesterification from the compound having the ureido group and a hydroxy composition containing one type or a plurality of types of hydroxy compounds.
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(2011/06/10)

PREPARATION OF CARBAMATES WITH SOLID CATALYSTS
Procedure for preparing carbamates comprising reaction between at least: an amine or polyamines, an organic carbonate of formula (OR)(OR')C=O, a catalyst formed at least by a support selected from among at least a metal oxide, a microporous material, a mesoporous material, an anionic laminar compound of the hydrotalcite type or derivatives thereof or an organic polymer and which may also contain a metal from groups 8, 9, 10 and 11 of the periodic system. The carbamates obtained may be converted into the corresponding isocyanates thereof.
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Page/Page column 6

(2011/05/08)

PROCESS FOR PRODUCING ISOCYANATE
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.
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Page/Page column 52

(2011/02/18)

ISOCYANATE PRODUCTION PROCESS
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.
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Page/Page column 42

(2011/05/03)

PROCESS FOR PRODUCING ISOCYANATES USING DIARYL CARBONATE
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.
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Page/Page column 40

(2011/04/14)

PROCESS FOR PRODUCING ISOCYANATE USING DIARYL CARBONATE
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.
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Page/Page column 50-51

(2011/02/18)

PROCESS FOR PREPARING ISOCYANATES
The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of at least one inert medium, the phosgene being passed into a reactor (21) through a first inlet and the amine through a second inlet of an ejector (1). The first inlet and the second inlet open into a mixing zone (17) in which the phosgene and the amine are mixed to give a reaction mixture. The mixing zone (17) is followed downstream by a diffuser (19) in which pressure and temperature of the reaction mixture composed of phosgene and amine are increased.
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Page/Page column 5

(2011/05/08)

USE OF A PISTON REACTOR TO IMPLEMENT A PHOSGENATION PROCESS
A process for phosgenating an amine comprising employing a plug-flow type reactor with internal recycle is disclosed. The process can be continuous, which makes it possible to prepare, in a single stage, a (poly)isocyanate with a good yield, without formation of byproducts and on simplifying the plant in order to carry out the process so as to promote safety.
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Page/Page column 4

(2012/01/03)

PROCESS FOR PREPARING ISOCYANATES BY THERMAL DISSOCIATION OF CARBAMATES
The invention relates to a process for preparing isocyanates by thermal dissociation of carbamates and separation by distillation of the reaction mixture from the carbamate dissociation, comprising the corresponding isocyanate and the corresponding alcohol, by distillation in a column (K) having an enrichment section (V) and a stripping section (A), where the carbamate (1) is introduced between the enrichment section (V) and the stripping section (A) and the isocyanate is taken off as a constituent of the bottom stream (2) and the alcohol is taken off as a constituent of the overhead stream (3) from the column (K), in the presence of an inert solvent, wherein an intermediate boiler having a boiling point between the boiling point of the isocyanate and the boiling point of the alcohol under the operating conditions of the carbamate dissociation is used as inert solvent and is fed as external runback (4) in liquid form in a purity of >95% by weight, based on the total weight of the external runback (4), in the upper region of the enrichment section (V) and as gaseous, superheated stream (5) into the lower region of stripping section (A) at one or more points.
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Page/Page column 3

(2011/08/04)

PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE
Aromatic isocyanates are produced by reacting one or more aromatic primary amines with phosgene in the gas phase. The phosgene and primary aromatic amine(s) are reacted at a temperature above the boiling temperature of the amine(s) in a reactor having a reaction space which is essentially rotationally symmetric to the direction of flow. The flow fate, averaged over the cross-section, of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is between 4 and 80 % is not more than 8 m/sec. The flow rate averaged over the cross-section of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is 4 to 80 % is always below the flow rate averaged over the cross-section at the start of this section.
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Page/Page column 8

(2010/06/22)

PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE
Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor.
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Page/Page column 9

(2010/07/04)

METHOD FOR PRODUCTION OF ISOCYANATE USING COMPOSITION COMPRISING CARBAMIC ACID ESTER AND AROMATIC HYDROXY COMPOUND, AND COMPOSITION FOR TRANSPORT OR STORAGE OF CARBAMIC ACID ESTER
An object of the present invention is to provide an isocyanate production process, which is free of the various problems found in the prior art, and which uses a composition containing a carbamic acid ester and an aromatic hydroxy compound when producing isocyanate without using phosgene, as well as a carbamic acid ester composition for transferring or storing carbamic acid ester. The present invention discloses an isocyanate production process including specific steps and using a composition containing a carbamic acid ester and an aromatic hydroxy compound, as well as a composition for transfer or storage of carbamic acid ester comprising the carbamic acid ester and the specific aromatic hydroxy compound.
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Page/Page column 68

(2010/02/17)

COSMETIC OR DERMATOLOGICAL COMPOSITION COMPRISING A POLYMER BEARING JUNCTION GROUPS, AND COSMETIC TREATMENT PROCESS
The present patent application relates to a cosmetic or dermatological composition comprising, in a cosmetically or dermatologically acceptable medium, a polymer comprising: (a) a polymer backbone that may be obtained by reaction: of a polyol comprising 3 to 6 hydroxyl groups;of a monocarboxylic acid containing 6 to 32 carbon atoms;of a polycarboxylic acid comprising at least two carboxylic groups COOH, and/or of a cyclic anhydride such as a polycarboxylic acid and/or of a lactone comprising at least one carboxylic group COOH; and(b) at least one junction group linked to the said polymer backbone and capable of establishing H bonds with one or more partner junction groups, each pairing of a junction group involving at least three H (hydrogen) bonds. The patent application also concerns a cosmetic treatment process using the said composition.
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(2010/10/03)

PROCESS FOR PRODUCING ISOCYANATE
An object of the present invention is to provide a process allowing long-term, stable production of isocyanates at a high yield without the various problems found in the prior art during production of isocyanates without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a decomposition reaction in the presence of a compound having an active proton and a carbonic acid derivative.
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Page/Page column 50

(2009/09/05)

PROCESSES FOR PREPARING LOW-CHLORINE ISOCYANATES
Processes comprising providing an amine reactant, and reacting the amine reactant with a stream of phosgene in a reaction zone to form a product comprising a corresponding isocyanate, wherein the phosgene stream has a CO content of 0.5% by weight or more.
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Page/Page column 4

(2009/04/24)

Process for the production of aromatic discocyanates in the gas
Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.
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Page/Page column 5

(2009/06/27)

METHOD FOR PRODUCING ISOCYANATE
An object of the present invention is to provide a process that enables isocyanates to be stably produced over a long period of time at high yield without encountering various problems as found in the prior art when producing isocyanates without using phosgene. The present invention discloses a process for producing an isocyanate, comprising the steps of: reacting a carbamic acid ester and an aromatic hydroxy compound to obtain an aryl carbamate having a group derived from the aromatic hydroxy compound; and subjecting the aryl carbamate to a decomposition reaction, wherein the aromatic hydroxy compound is an aromatic hydroxy compound which is represented by the following formula (1) and which has a substituent R1 at at least one ortho position of a hydroxyl group: (wherein ring A represents an aromatic hydrocarbon ring in a form of a single or multiple rings which may have a substitute and which have 6 to 20 carbon atoms; R1 represents a group other than a hydrogen atom in a form of an aliphatic alkyl group having 1 to 20 carbon atoms, an aliphatic alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms or an aralkyloxy group having 7 to 20 carbon atoms, the group containing an atom selected from a carbon atom, an oxygen atom and a nitrogen atom; and R1 may bond with A to form a ring structure).
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Page/Page column 40

(2009/09/05)

Process for the preparation of isocyanates in the gas phase
An isocyanate is produced by reacting a primary amine with phosgene in the gas phase above the boiling point of the amine over an average contact time of 0.05 to 15 seconds under adiabatic conditions.
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Page/Page column 4

(2008/12/06)

Process for the preparation of isocyanates in the gas phase
Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.
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Page/Page column 5-6

(2008/12/06)

Process for the production of the toluene diisocyanate
The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1 % by weight, based on 100% by weight of the toluenediamine.
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Page/Page column 5; 6

(2008/06/13)

One-pot catalytic process for the synthesis of isocyanates and installations for the same
One-pot process for the synthesis of isocyanates, polyisocyanates or mixtures thereof which comprises the steps of: i. preparing a mixture comprising an amine, an alcohol, an oxygen containing gas, carbon monoxide, a metal macrocyclic complex catalyst over solid support and a solvent with high oxygen solubility; ii. subjecting the resulting mixture to a first heating under pressure; iii. cooling and depressurizing the mixture resulting from the previous step; and iv. subjecting the mixture of the previous step to a second heating to separate out the isocyanate product from the mixture. The present invention is also related to an installation to carry out the process.
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Page/Page column 11

(2008/06/13)

ONE-STEP CATALYTIC PROCESS FOR THE SYNTHESIS OF ISOCYANATES
A one-pot process for the synthesis of isocyanates, polyisocyanates or mixtures thereof which includes the steps of: i. preparing a mixture comprising an amine, an alcohol, an oxygen-containing gas, carbon monoxide, a metal complex catalyst selected from the group consisting of macrocyclic complex catalysts and cobalt Shiff base catalysts; and a solvent selected from the group consisting of aliphatic or aromatic halocarbons, perhalogenated alcohols, halogenated ethers, halogenated ketones, perfluorinated hydrocarbons, polymers of chlorotrifluoroethylene having the formula —(CF2—CFCl)n wherein n is between 2 and 10, and mixtures thereof; ii. subjecting the resulting mixture to a first heating under pressure; iii. cooling and depressurizing the mixture resulting from the previous step; and iv. subjecting the mixture of the previous step to a second heating to separate out the isocyanate product from the mixture.
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Page/Page column 7

(2008/06/13)

METHOD FOR PRODUCING ISOCYANATES
The invention relates to a method for producing isocyanates by reacting amines with phosgene in the gaseous phase in a reaction zone, whereby in order to terminate the reaction, the reaction mixture is guided through a zone, into which a liquid is injected. The invention is characterised in that the reaction mixture is guided between the reaction zone and the zone into which the liquid is injected, through a zone with a reduced flow cross-section.
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Page/Page column 8

(2008/06/13)

Process for the production of (poly)isocyanates in the gas phase
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Diisocyanaten durch Phosgenierung der entsprechenden Diamine bei dem die dampff?rmigen Diamine, gegebenenfalls verdünnt mit einem Inertgas oder mit den D?mpfen eines inerten L?sungsmittels, und Phosgen getrennt auf Temperaturen von 200°C bis 600°C erhitzt und in einem Rohrreaktor (2) vermischt und zur Reaktion gebracht werden, dadurch gekennzeichnet, dass in dem Rohrreaktor (2) eine Anzahl n ≥ 2 von parallel zur Achse des Rohrreaktors ausgerichteten Düsen (5) angeordnet sind, wobei der die Diamine enthaltende Strom dem Rohrreaktor (2) über die n Düsen (5) zugeführt wird und der Phosgenstrom dem Rohrreaktor (2) über den verbleibenden freien Raum (6) zugeführt wird.
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Page 5

(2008/06/13)

Process for the purification of toluenediisocyanate incorporating a dividing-wall distillation column for the final purification
The invention is directed to a process for the purification of toluenediisocyanate from a crude distillation feed comprising less than 2% by weight of phosgene bya) fractionating the crude distillation feed comprising less than 2% by weight of phosgene to remove the solvent and optionally the reaction residues to produce a crude toluylenediisocyanate feed comprising less than 20% by weight of solvent and 'b) separating the crude toluylenediisocyanat feed comprising less than 20% by weight of solvent in a dividing-wall distillation column into four product fractions P1 - P4, wherebyP1 is a vapor phase low-boiler and solvent-enriched gas stream,P2 is a low-boiler and solvent-enriched product,P3 is a high boiler enriched bottoms product comprising toluenediisocyanat andP4 is a toluenediisocyanate product stream lean in low-boilers, high-boilers and reaction residues.
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Page column 6

(2008/06/13)

METHOD FOR PRODUCING ISOCYANATES
The invention relates to a continuous method for producing isocyanates by reacting primary amines with phosgene. The invention is characterized in that the reaction is carried out in a cascade of at least two tubular reactors and, after each reactor, the gas phase resulting during the reaction is separated in a phase separator, and only the liquid phase is fed to the next reactor or to the product purification. In addition, the reaction volume of the first tubular reactor is equal to only a fraction of the total reaction volume.
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Page 7

(2008/06/13)

A new and efficient catalytic method for synthesizing isocyanates from carbamates
Operationally simple, recyclable and environmentally friendly montmorillonite efficiently catalyses dealcoholysis of a wide range of mono- and dicarbamates to isocyanates.
Uriz, Pedro,Serra, Marc,Salagre, Pilar,Castillon, Sergio,Claver, Carmen,Fernandez, Elena
p. 1673 - 1676
(2007/10/03)