- PROCESS FOR PRODUCING 1,2,3,4-TETRACHLOROBUTANE
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There is provided a method of producing 1,2,3,4-tetrachlorobutane capable of stably and economically producing 1,2,3,4-tetrachlorobutane. A reactant solution (1) containing 3,4-dichloro-1-butene is charged in a reaction vessel (11) having an inner surface, to be brought into contact with the reactant solution (1), made of a metal and a chlorine gas is introduced into the reactant solution (1) to perform a reaction between 3,4-dichloro-1-butene and the chlorine gas to produce 1,2,3,4-tetrachlorobutane. The reaction is performed while carrying out an operation of taking out at least a portion of the reactant solution (1) from the reaction vessel (11), filtering the reactant solution (1) thus taken out to remove a solid matter, and returning the filtered reactant solution (1) into the reaction vessel (11).
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Paragraph 0054-0069
(2020/12/01)
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- Production method and production system of 1,2,3,4-tetrachlorobutane
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The invention relates to a production method and production system of 1,2,3,4-tetrachlorobutane. The production method comprises the following two steps: (1) introducing chlorine and gas 1,3-butadieneinto a solvent A in the presence of a catalyst, and obtaining a mixture A containing 1,2,3,4-tetrachlorobutane; and (2) mixing the mixture A obtained in step (1) and a solvent B, performing crystallization, and obtaining 1,2,3,4-tetrachlorobutane with high purity. The production method is high in reaction yield, moderate in conditions, simple in reaction, low in energy consumption, low in equipment requirement and high in yield. The production method is more suitable for industrialized production. The temperature of cold water can be adjusted at any time by virtue of a cold source preparationapparatus according to the requirement of a reactor, and the needed temperature in the reactor can be ensured.
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Paragraph 0018-0033
(2018/12/01)
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- PRODUCTION PROCESS AND PURIFICATION PROCESS FOR 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE
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It is an object of the present invention to provide a process for producing 1,2,3,4-tetrachlorohexafluorobutane industrially inexpensively and efficiently by utilizing expensive fluorine gas efficiently and to provide a process which is capable of stably producing 1,2,3,4-tetrachlorohexafluorobutane and in which, by carrying out fluorination reaction at a low temperature, side reactions such as formation of a low-boiling substance due to cleavage of C—C bonds and formation of an excess fluoride are difficult to occur. The process for producing 1,2,3,4-tetrachlorohexafluorobutane of the present invention is characterized in that it includes feeding fluorine gas to 1,2,3,4-tetrachlorobutane using plural reactors in the presence of a solvent and in the absence of a catalyst to allow the 1,2,3,4-tetrachlorobutane and the fluorine gas to react with each other, wherein a part or all of unreacted fluorine gas discharged from one reactor is introduced into a reactor different from said one reactor.
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Page/Page column 6
(2011/04/18)
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- PROCESS FOR PRODUCING 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE
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The present invention provides a process for producing 1,2,3,4-tetrachlorohexafluorobutane having a high purity at a low cost industrially and efficiently. The process for producing 1,2,3,4-tetrachlorohexafluorobutane according to the present invention comprises a step of allowing 1,2,3,4-tetrachlorobutane to react with a fluorine gas to prepare a reaction product containing 1,2,3,4-tetrachlorohexafluorobutane and hydrogen-containing compounds as an impurity, and a step of introducing the reaction product into single or plural distillation columns and distilling to separate the hydrogen-containing compounds from the reaction product and thereby preparing purified 1,2,3,4-tetrachlorohexafluorobutane wherein the at least one of distillation columns has a theoretical plate number of 15 or more.
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Page/Page column 3
(2011/05/16)
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- AN IMPROVED PROCESS FOR THE PREPARATION OF 2,3,-DICHLORO 1,3,BUTADIENE FROM 1,3 BUTADIENE
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The present invention relates to an improved process for the production of 2,3-Dichloro 1,3-Butadiene which comprises Chlorinating Butadiene, in liquid phase, in the presence of chlorinated solvents and phase transfer catalyst, Distilling the solvent, Distilling the formed 3,4-dichlorobutene-1, 1,4-dichlorobutene-2; and 1,2,3,4-Tetrachlorbutane; under reduced pressure,chlorinating the separated 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 to give 1,2,3,4-Tetrachlorobutane.,double Dehydrochlorinating the 1,2,3,4-Tetrachlorobutane using methanol,alkali and inhibitors under atmosphere of 1% oxides of nitrogen in nitrogen atmosphere the total period of Dehydrochlorinating being in the range of 15-33 hours to give 2,3-Dichloro 1,3-Butadiene and separating methanol to get 2,3-Dichloro 1,3-Butadiene
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Page/Page column 6
(2011/06/16)
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- PRODUCTION PROCESS FOR 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE AND REFINING PROCESS
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The production process for 1,2,3,4-tetrachlorohexafluorobutane of the present invention is characterized in that 1,2,3,4-tetrachlorobutane is reacted with fluorine in the presence of a solvent containing hydrogen fluoride. The 1,2,3,4-tetrachlorobutane may be obtained by chlorination of 3,4-dichlorobutene-1. Further, the present invention provides as well a process of refining 1,2,3,4-tetrachlorohexafluorobutane obtained in the manner described above. According to the present invention, 1,2,3,4-tetrachlorohexafluorobutane which is useful, for example, as a synthetic raw material for hexafluoro-1,3-butadiene used as an etching gas for semiconductors can industrially efficiently be produced by using 1,2,3,4-tetrachlorobutane which is a by-product of chloroprene and which has so far been disposed.
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Page/Page column 4-5
(2010/06/14)
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- PROCESS FOR PRODUCING 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE
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Disclosed is a process for producing 1,2,3,4-tetrachlorohexafluorobutane safely in a high yield in the industrial viewpoint and at low cost in the economical viewpoint. Specifically disclosed is a process for producing 1,2,3,4-tetrachlorohexafluorobutane which process comprises: (1) a step of chlorinating 1,3-butadiene, thereby preparing a mixture containing 1,2,3,4-tetrachlorobutane, and (2) a step of allowing the 1,2,3,4-tetrachlorobutane prepared in the step (1) to react with a fluorine gas in the presence of a diluting gas in a gas phase, thereby preparing a mixture containing 1,2,3,4-tetrachlorohexafluorobutane.
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Page/Page column 5
(2009/09/07)
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- KrF Laser-induced Thermal Decomposition of 1,2-Dichloroethane
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The thermal decomposition of 1,2-dichloroethane to give vinyl chloride and hydrogen chloride has been reinvestigated at 703 K and the major features of this free-radical chain reaction found previously have been confirmed.A direct comparison of the pulsed KrF laser-induced process (248 nm) in the same static reactor at this temperature showed that a substantial increase in rate occurs even at low pulse-repetition rates (2 Hz).In an extended study of the laser-induced reaction at temperature where thermal reaction is negligible (476-577 K), quantum yields of vinyl chloride formation have been measured to be between 3000 and 13 000.Quantum yields decreased slighthly with increasing pressure and showed an inverse square-root dependence on initial chlorine atom concentration.The major by-products were identified as ethene, ethyne, 1,2,3,4-tetrachlorobutane and 1,1,2-trichloroethane.At 577 K and 150 Torr, the quantum yield of ethene production is close to unity, indicating that under these conditions reaction (2) is essentially complete. C2H4Cl2 + hν (248 nm) --> CH2ClCH2* + Cl (1) CH2ClCH2* --> C2H4 + Cl (2) Computer modelling of a complete reaction mechanism involving the propagation steps (3) and (4) Cl + C2H4Cl2 --> C2H3Cl2 + HCl (3) C2H3Cl2 --> C2H3Cl + Cl (4) was used to predict quantum yields of both vinyl chloride and the minor products.
- Dyer, Peter E.,Matthews, Martin,Holbrock, Kenneth A.,Oldershaw, Geoffrey A.
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p. 2151 - 2156
(2007/10/02)
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- Three-Component Reactions. IX. Methoxychlorination of Butadiene. 1. Composition of Reaction Mixtures Obtained Using Either an Excess of Butadiene or an Excess of Chlorine
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Methoxychlorination of butadiene with 2 mol chlorine gives saturated secondary addition products 5-15, which were found identical with methoxychlorination products of unsaturated primary addition products 1-4 (investigated by capillar GLC). 1,2 and 3 add chlorine and methanol with high regioselectivity (80-90percent); meso and erythro isomer predominate in MARKOVNIKOV products from 1 and 2 (87percent diastereoselectivity). 5-7 and 11-15 were separated by preparative GLC for structural analysis.
- Beger, J.,Schiefer, H.,Movsumzade, M.M.,Gurbanov, P.A.
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p. 599 - 609
(2007/10/02)
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