- A 3, 3, 3-trifluoropropene method for the preparation of
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The invention discloses a preparation method of 3,3,3-trifluoropropene. The preparation method comprises the following steps: taking 1,1,1,3-tetrachloropropane and hydrogen fluoride as raw materials, taking an ionic liquid as a catalyst, performing a single-step liquid phase reaction to synthesize the 3,3,3-trifluoropropene, wherein the reaction temperature is 50-160 DEG C; the molar ratio of the ionic liquid to the 1,1,1,3-tetrachloropropane is (1:2) to (1:10); the molar ratio of the hydrogen fluoride to the 1,1,1,3-tetrachloropropane is (3.1:1) to (50:1); the general formula of the ionic liquid is X+A-; X+ is imidazole, pyridine and quaternary ammonium salt type substituted by C1-C8 alkyl; A- is metal acid radical anions containing aluminum, iron, antimony, tantalum, niobium, titanium, tin and other metals. In the invention, the ionic liquid is taken as the catalyst, and 1,1,1,3-tetrachloropropane and hydrogen fluoride are performed with the single-step liquid phase reaction to obtain 3,3,3-trifluoropropene. The process is free of a sodium hydroxide solution to take a dehydrochlorination reaction, so that the reaction steps are less, and the process is environment-friendly. In addition, the ionic liquid is taken as the catalyst, so that the ionic liquid is high in activity and can be recycled for multiple times.
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Paragraph 0015; 0029; 0030; 0031
(2017/02/24)
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- PROCESS FOR 1-CHLORO-3,3,3-TRIFLUOROPROPENE FROM TRIFLUOROMETHANE
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The present invention provides routes for making 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) from commercially available raw materials. More specifically, this invention provides routes for HCFO-1233zd from inexpensive and commercially available trifluoromethane (HFC-23).
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Paragraph 0058; 0060
(2015/02/25)
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- PROCESS FOR 1-CHLORO-3,3,3-TRIFLUOROPROPENE FROM TRIFLUOROPROPENE
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The present invention provides routes for making 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) from commercially available raw materials. More specifically, this invention provides several routes for forming HCFO-1233zd from 3,3,3-trifluoropropene (FC-1234zf).
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Paragraph 0073
(2015/02/25)
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- Compositions
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A composition comprising HCFO-1233xf and at least one additional compound selected from the group consisting of HCFO-1233zd, HCFO-1232xd, HCFO-1223xd, HCFC-253fb, HCFC-233ab, HFO-1234yf, HFO-1234ze, ethylene, HFC-23, CFC-13, HFC-143a, HFC-152a, HFO-1243zf, HFC-236fa, HCO-1130, HCO-1130a, HFO-1336, HCFC-244bb, HCFC-244db, HFC-245fa, HFC-245cb, HCFC-133a, HCFC-254fb, HCFC-1131, HCFO-1242zf, HCFO-1223xd, HCFC-233ab, HCFC-226ba, and HFC-227ca.
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Paragraph 0108
(2013/09/12)
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- PROCESSES FOR THE PRODUCTION OF FLUOROPROPANES AND HALOPROPENES AND AZEOTROPIC COMPOSITIONS OF 2-CHLORO-3,3,3-TRIFLUORO-1-PROPENE WITH HF AND OF 1,1,1,2,2-PENTAFLUOROPROPANE WITH HF
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A process is disclosed for making CF3CF2CH3, CF3CF=CH2 and/or CF3CCI=CH2. The process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX3CHCICH2X, halopropenes of the formula CCIX2CCI=CH2 and halopropenes of the formula CX2=CCICH2X, wherein each X is independently F or Cl, with HF in a reaction zone to produce a product mixture comprising HF, HCI, CF3CF2CH3, CF3CF=CH2 and CFsCCI=CH2; and recovering the CF3CF2CH3, CF3CF=CH2 and/or CFsCCI=CH2 from the product mixture. Also disclosed is a process for making CF3CH2CHF2, CFsCH=CHF and/or CF3CH=CHCI. This process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX3CHCICH2X, halopropenes of the formula CX3CCI=CH2 and halopropenes of the formula CX2=CCICH2X, wherein each X is independently F or Cl, with HF in a reaction zone to produce a product mixture comprising HF, HCI, CF3CH2CHF2, CF3CH=CHF and CF3CH=CHCI; and recovering the CF3CH2CHF2, CF3CH=CHF and/or CF3CH=CHCI from the product mixture. Also disclosed is a process for making CF3CF2CH3 and/or CF3CF=CH2- This process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX3CHCICH2X, halopropenes of the formula CX3CCI=CH2 and halopropenes of the formula CX2=CCICH2X, wherein each X is independently F or Cl, with HF in a reaction zone to produce a product mixture comprising HF, HCI, CF3CF2CH3 and CF3CF=CH2; and recovering the CF3CF2CH3 and/or CF3CF=CH2 from the product mixture. In each of the processes the molar ratio of HF to total amount of starting material fed to the reaction zone is at least stoichiometric. Also disclosed is an azeotropic composition comprising CF3CCI=CH2, and HF. Also disclosed is an azeotropic composition comprising CF3CF2CH3, and HF.
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Page/Page column 19
(2008/12/05)
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- Materials and methods for the conversion of hydrofluorocarbons
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Methods and materials are disclosed for the recovery of valuable hydrofluorocarbons and subsequent conversion to environmentally inert compounds. More specifically methods and materials are provided for recovering hydrofluorocarbons such as HFC-227, HFC-236, HFC-245, HFC-125, HFC-134, HFC-143, HFC-152, HFC-32, HFC-23 and their respective isomers. Processes are provided for converting hydrofluorocarbons such as these to fluoromonomer precursors such as CFC-217, CFC-216, CFC-215, CFC-115, CFC-114, CFC-113, CFC-112, HCFC-22, CFC-12, CFC-13 and their respective isomers. Materials, methods and schemes are provided for the conversion of these fluoromonomer precursors to fluoromonomers such as HFP, PFP, TFP, TFE, and VDF.
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- 246. Monofunctional (Dimethylamino)silane as Silylating Agent
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The reaction of triorganyl(dimethylamino)silanes with surface-hydrated silicon dioxide has been studied.These silylating agents are easy to prepare from the corresponding chloro or bromosilanes with dimethylamine.The resulting products are thermally stable and relatively volatile.Reaction with surface-hydrated silicon-dioxide preparations at a50-250 deg C for 170 h yields a dense grafted layer.However, with (dimethylamino)silanes having strongly polar substituents, a retreatment of the surface-modified silica seems to be necessary in order to attain maximum coverage.
- Szabo, Katalin,Le Ha, Ngoc,Schneider, Philippe,Zeltner, Peter,sz. Kovacs, Ervin
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p. 2128 - 2142
(2007/10/02)
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- REACTIONS OF CHLORINE MONOFLUORIDE. SUBSTITUTION OF CHLORINE ATOMS BY FLUORINE IN CHLORINE-SUBSTITUTED ALKANES AND ESTERS
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In anhydrous hydrogen fluoride under mild conditions chlorine monofluoride selectively substitutes the chlorine atoms in chlorine-substituted alkanes and esters by fluorine with the formation of high yields of the corresponding fluorides.The presence of an alkoxycarbonyl group or difluoromethylene group at the α position to the CHCl group deactivates the chlorine atom, and substitution by fluorine does not occur.In chloroalkanes, from which elimination of the chloride ion leads to sufficiently stable carbocations, substitution by fluorine can be realized in the absence of hydrogen fluoride at temperatures between -20 and -60 deg C.The fluorinating capacity of chlorine monofluoride is increased in the presence of catalytic amounts (3-5percent) of antimony pentachloride.Here the reaction is less selective than in hydrogen fluoride.In certain cases substitution is accompanied by hydride transfers.
- Chuvatkin, N. N.,Panteleeva, I. Yu.,Boguslavskaya, L. S.
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p. 821 - 827
(2007/10/02)
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