A kind of preparation method of 2-chloro-3,3,3-trifluoropropene

A technology of trifluoropropene and trifluoropropane, which is applied in the field of preparation of 2-chloro-3,3,3-trifluoropropene, can solve the problem that the inhibition of catalyst deactivation cannot be well achieved, the requirement of HF water content is high, and the product Problems such as low selectivity, to achieve the effect of being conducive to product diffusion, reducing product coking, and simple process flow
CN111559954BActive Publication Date: 2022-04-12常州新东化工发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
常州新东化工发展有限公司
Publication Date
2022-04-12

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Abstract

The invention discloses a preparation method of 2-chloro-3,3,3-trifluoropropene, which mainly includes the following steps: (1) passing 3,3,3-trifluoropropene and chlorine gas into the ,3-dichloro-1,1,1-trifluoropropane in the light chlorination reactor; (2) the reactants in the photochlorination reactor in step (1) are continuously added to the rectification tower, and the tower still Obtain 2,3-dichloro-1,1,1-trifluoropropane; (3) use a metering pump to add 2,3-dichloro-1,1,1-trifluoropropane obtained in step (2) into gasification After being vaporized, it is mixed with oxygen-deficient nitrogen gas, and then enters a fixed-bed reactor equipped with a catalyst for gas-phase catalytic dehydrochlorination; (4) Pass the reaction gas from the fixed-bed reactor in step (3) through the primary cooler, The secondary cooler is condensed to obtain the material of crude 2-chloro-3,3,3-trifluoropropene, and the crude 2-chloro-3,3,3-trifluoropropene is purified by distillation. The invention has the advantages of high product selectivity, simple process and easy industrialization.
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Description

technical field

[0001] The invention relates to the technical field of synthesis of intermediates, in particular to a preparation method of 2-chloro-3,3,3-trifluoropropene. Background technique

[0002] 2-Chloro-3,3,3-trifluoropropene (HCFO-1233xf) can be used as an intermediate for the preparation of various fluorocarbons, such as for the synthesis of HFC-245fa, HFO-1234yf, etc., and can also be used as a monomers of a polymer.

[0003] There are many preparation methods for HCFO-1233xf, for example: CN109651077A uses a chromium-containing fluorination catalyst to catalyze the reaction of polyhalopropene and HF under gas phase conditions to prepare HCFO-1233xf. This method requires high water content in HF and uses Chromium is catalyzed by heavy metals, and the pollution is relatively large. WO2007079431 and WO2008054781 use 1,1,2,3-tetrachloropropene as a raw material to synthesize HCFO-1233xf by gas-phase fluorination under the action of a chromium catalyst. This method...

Claims

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