A method for preparing 2-chloro-3,3,3-trifluoropropene

A technology of trifluoropropene and trichloropropene, which is applied in the field of preparation of 2-chloro-3,3,3-trifluoropropene, which can solve the problems of easy carbon formation, reactor clogging, and high reaction temperature

Active Publication Date: 2016-09-28
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also needs to use dangerous chlorine, and because this reaction is a thermal chlorination reaction and the reaction temperature is high, the raw material 1,1,3-trichloropropene and / or 3,3,3-trichloropropene and intermediate 1, 1,2,3-Tetrachloropropene is easy to form carbon and block the reactor

Method used

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  • A method for preparing 2-chloro-3,3,3-trifluoropropene

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Embodiment 1

[0036] The preparation of embodiment 1 oxychlorination catalyst

[0037] Weigh out 125 g of CuCl 2 2H 2 O, 63 grams of MgCl 2 Dissolve in 1000ml of deionized water to make solution A; weigh 40 grams of aluminum hydroxide powder, add it to the sodium hydroxide solution at 50°C with stirring, and stir for 15 minutes to make solution B; add solution A to the solution while stirring In B, stir for 20 minutes after adding, then precipitate, wash with deionized water until the conductivity is greater than 400Ω·cm -1 , and then filtered and dried; the washed catalyst particles are now dried at 150°C for 2 hours, and then roasted at 450°C for 2 hours, and finally the dried catalyst particles are made into a cylindrical shape, ready for use.

Embodiment 2

[0038] Example 2 Preparation of HCFC-1233xf

[0039] Raw material molar ratio is CCl 2 =CHCH 2 Cl:HCl:O 2 :HF=1:1.2:2.4:10, reaction temperature 200-350℃, reaction pressure 0.3MPa, space velocity 400h -1 , The oxychlorination catalyst is as shown in example 1, and the loading amount is 200ml, and the loading amount of the fluorination catalyst is 200ml.

[0040] Table 1

[0041]

[0042]

Embodiment 3

[0043] Example 3 Preparation of HCFC-1233xf

[0044] Raw material molar ratio is CH 2 =CHCCl 3 :HCl:O 2 :HF=1:1.2:2.4:10, the reaction temperature is 260°C, the reaction pressure is 0.3MPa, the space velocity of the raw material relative to the oxychlorination catalyst and the fluorination catalyst is 200-600h -1 , The oxychlorination catalyst is as shown in example 1, and the loading amount is 200ml, and the loading amount of the fluorination catalyst is 200ml.

[0045] Table 2

[0046]

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Abstract

The invention discloses a method for preparing 2-chloro-3,3,3-trifluoropropene from trichloropropene. First, 1,1,3-trichloropropene and / or 3,3,3-trichloropropene, HCl and O 2 The gas phase mixture of the mixture is used as a raw material, reacted under the action of an oxychlorination catalyst, and then passed through anhydrous HF under the action of a fluorination catalyst for further reaction to obtain 2-chloro-3,3,3-trifluoropropene. The 2-chloro-3,3,3-trifluoropropene prepared by the invention can be used to synthesize 2,3,3,3-tetrafluoropropene.

Description

technical field [0001] The invention relates to a preparation method of halogen-containing olefins, in particular to a preparation method of 2-chloro-3,3,3-trifluoropropene. Background technique [0002] According to the provisions of the Montreal Protocol, the most widely used GWP value (relative to CO 2 In terms of hydrofluorocarbon refrigerant HFC-134a with a higher GWP value of 1340). In the process of finding a substitute for HFC-134a, developed countries plan to use 2,3,3,3-tetrafluoropropene (HFO-1234yf). In addition to being used as a refrigerant, HFO-1234yf can also be used as a The polymerized monomers and comonomers of elastic thermoelastic rubber materials have a large market capacity. [0003] In the preparation process of HFO-1234yf, 2-chloro-3,3,3-trifluoropropene (HCFC-1233xf) is the most useful intermediate. For the preparation method of HCFC-1233xf, there are mainly the following reports: US Patent US2009030244 reports Through at least one of 1,1,2,3-tet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/18C07C17/20
Inventor 杨刚许磊杨会娥陈蜀康张文庆柴华赵新堂晏少华樊建平曾昌华刘坤峰
Owner SINOCHEM LANTIAN
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