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Production of 3,3,3-trifluoro-propene

A technology of trifluoropropene and hydrogen fluoride, which is applied in 3 fields, can solve the problems of short catalyst life and achieve the effects of prolonging life, lowering reaction temperature, and slowing down the rate of carbon formation

Inactive Publication Date: 2007-11-21
XIAN MODERN CHEM RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prolongs the life of the catalyst by adding a small amount of hexachloroethane or chlorine to the reaction material, but this method still has the problem of short catalyst life due to by-products such as olefin impurities and high polymers, and it is necessary to increase the separation device. For separating hexachloroethane or chlorine in TFP

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The TCP liquid was sprayed into the superheated HF gas at different temperatures to vaporize the TCP, and the composition of organic materials in the vaporized gas mixture was analyzed by gas chromatography. The results are shown in Table 1.

[0026] Superheated HF gas temperature / ℃

Embodiment 2

[0028] Into a nickel tube reactor with an inner diameter of 38 mm, add 50 ml of a chromium-based fluorination catalyst containing Al, Zn, Mg, and Ni. The TCP liquid is sprayed into the gaseous HF at 150°C, and the vaporized HF and TCP mixed gas enters the reactor for reaction. The reaction conditions are 0.02MPa pressure and 1500h space velocity. -1 , The molar ratio of HF to TCP is 15:1, and the conversion rate of TCP and the selectivity of TFP at different reaction temperatures are in the range of reaction temperature 230°C to 320°C. After 20 h, the conversion rate of TCP and the selectivity of TFP were analyzed by gas chromatography, and the results are shown in Table 2.

[0029] Reaction temperature / ℃

Embodiment 3

[0031] Basically the same steps as in Example 2, the difference is that the reaction conditions are: the reaction pressure is 0.02MPa, the reaction temperature is 260°C, and the space velocity is 1500h -1 , to investigate the reaction results of fluorinated TCP to TFP at different molar ratios of HF and TCP. The results are shown in Table 3.

[0032] HF / TCP

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PUM

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Abstract

Production of 3,3,3-trifluopene is carried out by taking hydrogen fluoride and 1,1,1,3-tetrachloropane as raw materials, jetting 1,1,1,3-tetrachloropane liquid into overheat hydrogen fluoride gas at 120-230 degree, entering mixed gas of HF and 1,1,1,3-tetrachloropane into reactor in proportion of 5-25:1 mol at 230-300 degree, 500h-1-3500h-1 and 0MPa-0.6MPa and gas-phase fluorizating to obtain final product. It can decrease olefin hydrocarbon impurities and high-polymer content effectively and extend fluorizating catalyst life.

Description

technical field [0001] The present invention relates to a kind of preparation method of 3,3,3-trifluoropropene (TFP), especially a kind of hydrogen fluoride (HF) gas-phase catalytic fluorination of 1,1,1,3-tetrachloropropane (TCP) to obtain 3, Process for the preparation of 3,3-trifluoropropene. Background technique [0002] 3,3,3-Trifluoropropene is the basic raw material for the synthesis of high-performance polymer materials such as fluorosilicone rubber and fluorosilicone oil. Fluorosilicone rubber has excellent physical and chemical properties and is widely used in extreme environments such as aerospace, aviation, and polar regions. With the rapid development of civilian research and development, especially in the automotive and electrical industries, such as car carburetor sealing caps, motor silicone cable joints, etc. Has been widely used. In addition, TFP can further develop fluorine-containing functional materials, and can also be used as pesticides, pharmaceutic...

Claims

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Application Information

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IPC IPC(8): C07C19/08C07C17/20
Inventor 吕剑张伟王博石磊寇联岗何飞
Owner XIAN MODERN CHEM RES INST
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