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A method for preparing trans-1,3,3,3-tetrafluoropropene by normal temperature isomerization of mixture

A technology of tetrafluoropropene and mixed materials, which is applied in the preparation of dehydrohalogenation, chemical instruments and methods, preparation of halogenated hydrocarbons, etc., can solve the problems of unsatisfactory conversion rate and high requirements on raw material purity, and achieves easy acquisition and low cost. , selective effect

Active Publication Date: 2019-10-11
陕西延长石油矿业有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing trans-1,3,3,3-tetrafluoropropene by normal temperature isomerization of the mixture, which solves the problem of preparing trans-1,3,3,3-tetrafluoropropene in the prior art. In the process of 1,3,3,3-tetrafluoropropene, the raw material purity is high and the conversion rate is not ideal.

Method used

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  • A method for preparing trans-1,3,3,3-tetrafluoropropene by normal temperature isomerization of mixture
  • A method for preparing trans-1,3,3,3-tetrafluoropropene by normal temperature isomerization of mixture

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Embodiment 1

[0037] This example provides a method for preparing trans-1,3,3,3-tetrafluoropropene by isomerizing the mixture at room temperature. The specific process of the method is as follows:

[0038] In step 1, pentafluoropropane and tetrafluorochloropropane are passed into the first reactor as a mixture, and then anhydrous hydrogen fluoride is passed into, and the gas phase dehydrohalogenation reaction of dehydrofluorination and hydrogen chloride is carried out in the first reactor, wherein :

[0039] Pentafluoropropane is 1,1,1,3,3-pentafluoropropane.

[0040] Tetrafluorochloropropane is 1,1,1,3-tetrafluoro-3-chloropropane.

[0041] In the mixture, in parts by weight, the pentafluoropropane accounts for 99%, and the tetrafluoromonochloropropane accounts for 1%.

[0042] The input amount of anhydrous hydrogen fluoride is 8% of compound weight.

[0043] The reaction temperature in the first reactor was 380° C., and the reaction pressure was 1.0 MPa.

[0044] The catalyst for gas p...

Embodiment 2

[0056] This example provides a method for preparing trans-1,3,3,3-tetrafluoropropene by isomerizing the mixture at room temperature. The process of this method is basically the same as that of Example 1, the only difference being: the mixing In the material, in parts by weight, pentafluoropropane is 90%, and tetrafluoromonochloropropane is 10%.

[0057] The GC-MS collection of illustrative plates of the product trans-1,3,3,3-tetrafluoropropene of the present embodiment and figure 2 same.

[0058] The chromatographic conditions detected by the gas chromatography of the present embodiment are the same as those in Example 1.

[0059] The product of step 1 was analyzed by gas chromatography, and the results showed that the conversion rate of the raw material was 91.8%, the selectivity of the effective component HFO-1234ze was 99.1%, and the selectivity of E-HFO-1234ze was 80.8%.

[0060] The product of step 2 was analyzed by gas chromatography, and the results showed that the c...

Embodiment 3

[0062] This example provides a method for preparing trans-1,3,3,3-tetrafluoropropene by isomerizing the mixture at room temperature. The process of this method is basically the same as that of Example 1, the only difference being: the mixing In the material, in parts by weight, pentafluoropropane is 10%, and tetrafluoromonochloropropane is 90%.

[0063] The GC-MS collection of illustrative plates of the product trans-1,3,3,3-tetrafluoropropene of the present embodiment and figure 2 same.

[0064] The chromatographic conditions detected by the gas chromatography of the present embodiment are the same as those in Example 1.

[0065] The product of step 1 was analyzed by gas chromatography, and the results showed that the conversion rate of the raw material was 89.8%, the selectivity of the effective component HFO-1234ze was 99.0%, and the selectivity of E-HFO-1234ze was 80.0%.

[0066] The product of step 2 was analyzed by gas chromatography, and the results showed that the c...

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Abstract

The invention provides a method for preparing trans-1,3,3,3-tetrafluoropropene from a mixture through normal-temperature isomerization. The method comprises the steps of conducting a gas-phase dehydrofluorination reaction for dehydrofluorination and dehydrochlorination in a first reactor with a mixture of pentafluoropropane and tetrafluoromonochloropropane as a raw material by introducing anhydrous hydrogen fluoride; introducing all the mixture obtained in the first reactor into a second reactor and conducting a gas-phase isomerization reaction with chromic fluoride as a catalyst at normal temperature and normal pressure; and separating pentafluoropropane, tetrafluoromonochloropropane, hydrogen fluoride, hydrogen chloride and cis-1,3,3,3-tetrafluoropropene in a reaction product to obtain a purified product, namely the trans-1,3,3,3-tetrafluoropropene. The raw materials are easy to obtain. The process route is simple and flexible. The conversion rate is high. The target product is good in selectivity and low in cost. According to the method, the temperature of the isomerization reaction is reduced to the normal temperature; the chromic fluoride catalyst is prepared for the normal-temperature reaction; and moreover, the incoming material for the isomerization reaction is all the unseparated material obtained from the reaction in the last step.

Description

technical field [0001] The invention belongs to the field of preparation of hydrofluoroolefins, and relates to the preparation of trans-1,3,3,3-tetrafluoropropene, in particular to a kind of preparation of trans-1,3,3,3-tetrafluoropropene by normal temperature isomerization of a mixture Tetrafluoropropene method. Background technique [0002] Traditionally, hydrofluorocarbons (HFCs) such as 1,1,3,3,3-pentafluoropropane and 1,1,1,2-tetrafluoroethane have been used as refrigerants, blowing agents and propellants . In recent years, there has been widespread concern that certain hydrofluorocarbons, although not depleting the ozone layer, can cause the greenhouse effect. As a result, there is a worldwide effort to use halocarbons that contain little or no HFCs. Therefore, the production of hydrofluoroolefins has been the object of attention to provide compositions for use as blowing agents, refrigerants, aerosol propellants, heat transfer media, fire extinguishing agents. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C17/358C07C21/18
Inventor 魏效农刘建国李立焦锋刚马家琪聂剑飞高炜李骥付旭东孟庆宇张伟曾纪珺韩升王伟吕剑
Owner 陕西延长石油矿业有限责任公司