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2-chloro-3,3,3-trifluoropropylene preparation method

A kind of technology of trifluoropropene and cyclopropane, applied in the field of preparing 2-chloro-3

Active Publication Date: 2013-03-27
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] There is no report on the method of preparing 2-chloro-3,3,3-trifluoropropene from halocyclopropane

Method used

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Experimental program
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Embodiment 1

[0039] Embodiment 1: Preparation of gas phase fluorination catalyst

[0040] 1g of ZnCl 2 , 13g of Al(NO 3 ) 3 9H 2 O, 360g of 10% CrCl 3 The solution is obtained by co-precipitation method to obtain hydroxide, which is fired, and then 15ml of the mixed metal fluoride salt obtained by HF treatment is put into a Monel alloy reactor, and chlorine gas is introduced at 400°C for 4 hours. Residual chlorine was removed with nitrogen. Then, when the reaction temperature is lowered to a suitable temperature, the reaction gas can be introduced to carry out the reaction.

Embodiment 2

[0041] Embodiment 2: the gas phase preparation of HCFC-1233xf

[0042] exist In the Monel alloy tube of the above-mentioned catalyzer, catalyzer is the catalyzer shown in embodiment 1, after processing as shown in embodiment 1, loading capacity is 50ml, earlier pentachlorocyclopropane and anhydrous HF are passed into preheating tank, After fully preheating and mixing at 200 ° C, it enters the reactor for reaction. The molar ratio of pentachlorocyclopropane and anhydrous HF is 6:1, and the contact time is 8.3 seconds. The product leaving the reactor is analyzed by GC-MS. The results are summarized in Table 1:

[0043] Table 1

[0044]

Embodiment 3

[0045] Embodiment 3: the gas phase preparation of HCFC-1233xf

[0046] exist In the Monel alloy tube of the above-mentioned catalyzer, catalyzer is the catalyzer shown in embodiment 1, after processing as shown in embodiment 1, loading capacity is 50ml, earlier pentachlorocyclopropane and anhydrous HF are passed into preheating tank, After fully preheating and mixing at 200°C, add to the reactor for reaction, the reaction temperature is 350°C, the contact time is 8.3 seconds, the molar ratio of HF and pentachlorocyclopropane is changed, and the product leaving the reactor is analyzed by GC-MS. The results are summarized in Table 2:

[0047] Table 2

[0048]

[0049]

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Abstract

The invention provides a 2-chloro-3,3,3-trifluoropropylene preparation method. 2-chloro-3,3,3-trifluoropropylene is prepared through reacting halogenated cyclopropane which is a raw material and has a formula of C3HClXmYn with HF under the action of a fluorination catalyst, X and Y in the C3HClXmYn are independently selected from F, Cl, Br and I, m and n are integers in a range of 0-4, and the m+n value is 4. The method has the advantages of novel synthetic route, easily available raw material, high selectivity, high conversion rate and the like. The synthesized 2-chloro-3,3,3-trifluoropropylene can be used for preparing 2,3,3,3-tetrafluoropropylene.

Description

technical field [0001] The present invention relates to a method for preparing 2-chloro-3,3,3-trifluoropropene, in particular to a method for preparing 2-chloro-3,3,3-trifluoropropene with halogenated cyclopropane as raw material . Background technique [0002] According to the provisions of the Montreal Protocol, HFC-134a, the most widely used refrigerant with a high greenhouse effect, will be phased out (relative to CO 2 For example, the GWP value is 1340). In the process of finding a substitute for HFC-134a, the use of 2,3,3,3-tetrafluoropropene (HFO-1234yf) to replace HFC-134a has been approved by major European automobile manufacturers, and countries such as Europe, the United States, and Japan have allowed it to start from 2011 Since January 1, 2017, HFO-1234yf has been sold in the market and filled in new vehicles to replace the third-generation environmentally friendly refrigerant HFC-134a. On January 1, 2017, all vehicles are not allowed to be filled with HFC-134a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/20
Inventor 杨刚许磊杨会娥姜恩雷云龙樊建平赵新堂曾昌华张文庆李俊峰李忠陈蜀康
Owner SINOCHEM LANTIAN
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