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Preparation method of 1-chloro-3,3,3-trifluoropropene

A technology of trifluoropropene and trifluoropropane, applied in the field of preparation of 1-chloro-3,3,3-trifluoropropene, which can solve the problems of many by-products, low yield and low selectivity

Inactive Publication Date: 2014-06-18
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned preparation method of HCFC1233zd, there are problems of high reaction temperature and low yield, and some preparations also have the problems of many by-products and low selectivity

Method used

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  • Preparation method of 1-chloro-3,3,3-trifluoropropene
  • Preparation method of 1-chloro-3,3,3-trifluoropropene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In a pressure reactor with a stirrer with a volume of 0.5L, add 1.0mol of the raw material 1,1-dichloro-3,3,3-trifluoropropane (HCFC243fa) with a mass concentration of 30% KOH solution (KOH The molar ratio with 1,1-dichloro-3,3,3-trifluoropropane is 1:1), the phase transfer catalyst tetrabutylammonium bromide is 0.01mol, and then the reactor is closed for reaction, stirring is started, The stirring speed is 200 rev / min, turn on the heating to increase the reaction temperature, the temperature is controlled at 70°C-80°C, and the reaction is carried out at constant temperature for 3.5 hours, keeping the pressure of the reaction system at 0.2MPa-0.5MPa to obtain a crude product, which is analyzed by gas chromatography. The conversion rate of HCFC243fa and the yield of HCFC1233zd are shown in Table 1 below.

Embodiment 2

[0028] The same operation as in Example 1, except that the mass concentration of KOH was changed to 40%, and the reaction results are shown in Table 1.

Embodiment 3

[0030] The same operation as in Example 1, except that the mass concentration of KOH was changed to 25%, and the reaction results are shown in Table 1.

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Abstract

The invention provides a preparation method of 1-chloro-3,3,3-trifluoropropene. Under an action of a catalyst, 1,1-dichloro-3,3,3-trifluoropropane is subjected to liquid-phase dehydrochlorination to generate 1-chloro-3,3,3-trifluoropropene. The catalyst comprises a main catalyst and a cocatalyst, the main catalyst is an inorganic alkali, and the cocatalyst is a phase-transfer catalyst. The preparation method provided by the invention has the advantages of high yield, easily available raw materials, mild preparation process, simple operation, and fewer by-product impurities.

Description

technical field [0001] The present invention relates to a preparation method of 1-chloro-3,3,3-trifluoropropene (HCFC1233zd), in particular to a preparation method of 1-chloro-3,3,-trifluoropropene by dehydrochlorination of chlorofluoroalkane as raw material Propylene method. Background technique [0002] Uses of 1-chloro-3,3,3-trifluoropropene (HCFC1233zd) include the preparation of 1,1,1,3,3-pentafluoropropane (HCFC245fa), production of polymers as fluorine-containing monomers, and use in organic compounds Introducing CF 3 The structural block raw material of the group. In addition, since 1-chloro-3,3,3-trifluoropropene, which is a fluorine-containing unsaturated hydrocarbon, has a double bond in the molecule, the ODP and the global warming factor (GWP) are extremely small, and it is one of the alternatives. Substances of concern. [0003] For the preparation method of 1-chloro 3,3,3-trifluoropropene in the prior art, the following reports are arranged: [0004] WO97 / ...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/25
Inventor 肖恒侨韩国庆徐卫国盛楠陈明炎项文勤
Owner SINOCHEM LANTIAN
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