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

A technology of trifluoropropene and inhibitor, applied in 3 fields, can solve the problems of fast carbon formation of catalyst, low catalyst service life, many tetrachloropropene olefin impurities, etc.

Active Publication Date: 2021-07-16
衢州环新氟材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a new 3,3,3-trifluoropropene compound for the defects of fast carbonization of the catalyst, low service life of the catalyst, high tetrachloropropene polymer and product olefin impurities in the prior art. Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of 3,3,3-trifluoropropene, comprises the following steps:

[0031] (1) Stir and mix the reaction raw material 1,3,3,3-tetrachloropropane and the inhibitor in a mixing tank to form a mixture. The inhibitor contains trifluoro groups and monochloro and dichloro substituents Unsaturated monoolefin compound, the monochloro and dichloro substituents are located on double-bonded carbon atoms, and the molar ratio of the 1,3,3,3-tetrachloropropane and inhibitor is 1:5;

[0032] (2) The mixture obtained in step (1) is transported to the first vaporizer through a metering pump for vaporization, and the vaporization temperature is 80°C;

[0033] (3) Pass hydrogen fluoride into the second vaporizer for vaporization, and the vaporization temperature is 80°C;

[0034] (4) The product obtained after gasification in step (2) and the product obtained after gasification in step (3) are simultaneously passed into a gas phase reactor equipped with a catalyst fo...

Embodiment 2

[0043] A kind of preparation method of 3,3,3-trifluoropropene, comprises the following steps:

[0044] (1) Stir and mix the reaction raw material 1,3,3,3-tetrachloropropane and the inhibitor in a mixing tank to form a mixture. The inhibitor contains trifluoro groups and monochloro and dichloro substituents Unsaturated monoolefin compound, the monochloro and dichloro substituents are located on double-bonded carbon atoms, and the molar ratio of the 1,3,3,3-tetrachloropropane and inhibitor is 1:5;

[0045] (2) The mixture obtained in step (1) is transported to the first vaporizer through a metering pump for vaporization, and the vaporization temperature is 120°C;

[0046] (3) Pass hydrogen fluoride into the second vaporizer for vaporization, and the vaporization temperature is 120°C;

[0047] (4) The product obtained after gasification in step (2) and the product obtained after gasification in step (3) are simultaneously passed into a gas phase reactor equipped with a catalyst ...

Embodiment 3

[0056] A kind of preparation method of 3,3,3-trifluoropropene, comprises the following steps:

[0057] (1) Stir and mix the reaction raw material 1,3,3,3-tetrachloropropane and the inhibitor in a mixing tank to form a mixture. The inhibitor contains trifluoro groups and monochloro and dichloro substituents Unsaturated monoolefin compound, the monochloro and dichloro substituents are located on double-bonded carbon atoms, and the molar ratio of the 1,3,3,3-tetrachloropropane and inhibitor is 1:10;

[0058] (2) The mixture obtained in step (1) is transported to the first vaporizer through a metering pump for vaporization, and the vaporization temperature is 200°C;

[0059] (3) Pass hydrogen fluoride into the second vaporizer for vaporization, and the vaporization temperature is 200°C;

[0060] (4) The product obtained after gasification in step (2) and the product obtained after gasification in step (3) are simultaneously passed into a gas phase reactor equipped with a catalyst...

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PUM

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Abstract

The invention discloses a preparation method of 3,3,3-trifluoropropene, (1) uniformly mixing 1,3,3,3-tetrachloropropane and an inhibitor at a molar ratio of 1:5-50; (2 ) Send the mixture to the first vaporizer for vaporization, the vaporization temperature is 80°C-300°C; (3) Pass hydrogen fluoride into the second vaporizer for vaporization, the vaporization temperature is 80°C-300°C; (4) After the steps ( The product of 2) and the product of step (3) are simultaneously fed into a gas phase reactor equipped with a catalyst for reaction, the total molar ratio of 1,3,3,3-tetrachloropropane and inhibitor to hydrogen fluoride is 1:1, Reaction temperature 200℃~600℃, reaction space velocity 2000h ‑1 ~4000h ‑1 , the reaction pressure is 0.2Mpa-1.0Mpa; (5) Purifying the product in step (4) to obtain 3,3,3-trifluoropropene. The invention improves the service life of the catalyst, reduces impurities produced in the preparation process, and improves the conversion rate of 1,3,3,3-tetrachloropropane and the yield of 3,3,3-trifluoropropene.

Description

technical field [0001] The invention relates to a preparation method of fluorine-containing olefin compound, in particular to a preparation method of 3,3,3-trifluoropropene. Background technique [0002] 3,3,3-Trifluoropropene is the basic raw material for the synthesis of high value-added organic compounds such as trifluoropropylene oxide, 2-bromotrifluoropropane, fluorosilicone rubber, fluorosilicone oil, fluorosilicone coating, and pharmaceutical intermediates. Among them, fluorosilicone rubber and fluorosilicone oil have superior fuel resistance, solution resistance and cold resistance, so developed countries are accelerating the development of a series of fluorosilicone material products. Under the environment of national energy conservation and emission reduction and the rapid growth of demand for automobiles and aerospace, the demand for 3,3,3-trifluoropropene is increasing year by year, and the preparation technology of 3,3,3-trifluoropropene also requires More gree...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C17/20C07C17/38C07C17/383C07C21/18
CPCC07C17/206C07C17/25C07C17/38C07C17/383C07C21/18
Inventor 方海滔应永安杨新华陈伟严浩芳
Owner 衢州环新氟材料有限公司
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