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A method for continuously synthesizing 2,3,3,3-tetrafluoropropene in gas phase

A tetrafluoropropene, continuous process technology, applied in 2 fields, can solve the problems of low tetrafluoropropene yield, difficult catalyst preparation, etc., and achieve the effects of low equipment investment cost, wide industrial application prospects, and simple equipment operation

Active Publication Date: 2022-02-01
ZHEJIANG SANMEI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this preparation method is that it consumes the toxic substance CF 3 CF 2 CH 3 , the disadvantage is the low yield of 2,3,3,3-tetrafluoropropene
The preparation method has a high conversion rate, but the catalyst CrO x f y more difficult to prepare

Method used

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  • A method for continuously synthesizing 2,3,3,3-tetrafluoropropene in gas phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Chloromethane and tetrachlorethylene are mixed and preheated to 140°C by the first preheater, and then enter the first reactor of a stainless steel alloy tube with a length of 1.5m and an inner diameter of 80mm. The catalyst CuCl-MgCl 2 / Al 2 o 3 In the presence of the reaction, the reaction temperature is 220°C, the reaction pressure is 0.2MPa, and the space velocity is 500h -1 , the feed molar ratio of monochloromethane and tetrachloroethylene is 2:1, and the product mixture is obtained; the product mixture enters the first separation tower for separation, and the by-product HCl and a small amount of unreacted monochloromethane and tetrachloroethylene are separated from the top of the tower The mixture of the tower top product is recycled to the first reactor after being absorbed and separated by HCl, and the tower bottom liquid containing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene is obtained ;

[0028]Pump the 1,1,1,2,2-pentachloropropane and 2,3...

Embodiment 2

[0033] Chloromethane and tetrachlorethylene are mixed and preheated to 140°C by the first preheater, and then enter the first reactor of a stainless steel alloy tube with a length of 1.5m and an inner diameter of 80mm. The catalyst CuCl-MgCl 2 / Al 2 o 3 In the presence of the reaction, the reaction temperature is 240°C, the reaction pressure is 0.3MPa, and the space velocity is 600h -1 , the feeding molar ratio of monochloromethane and tetrachloroethylene is 4:1, obtains the product mixture; The product mixture enters the first separation tower for separation, and the by-product HCl and a small amount of unreacted monochloromethane and tetrachloroethylene are separated from the top of the tower The mixture of the tower top product is recycled to the first reactor after being absorbed and separated by HCl, and the tower bottom liquid containing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene is obtained ;

[0034] Pump the 1,1,1,2,2-pentachloropropane and 2,3,3,3...

Embodiment 3

[0039] Chloromethane and tetrachlorethylene are mixed and preheated to 140°C by the first preheater, and then enter the first reactor of a stainless steel alloy tube with a length of 1.5m and an inner diameter of 80mm. The catalyst CuCl-MgCl 2 / Al 2 o 3 In the presence of the reaction, the reaction temperature is 220°C, the reaction pressure is 0.4MPa, and the space velocity is 500h -1 , the feed molar ratio of monochloromethane and tetrachloroethylene is 10:1, and the product mixture is obtained; the product mixture enters the first separation tower for separation, and the by-product HCl and a small amount of unreacted monochloromethane and tetrachloroethylene are separated from the top of the tower The mixture of the tower top product is recycled to the first reactor after being absorbed and separated by HCl, and the tower bottom liquid containing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene is obtained ;

[0040] Pump the 1,1,1,2,2-pentachloropropane and 2...

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Abstract

The invention discloses a method for continuously synthesizing 2,3,3,3-tetrafluoropropene in a gas phase. In the presence of a catalyst, tetrachloroethylene and methyl chloride undergo a telomerization reaction to generate 1,1,1,2, Catalyzed fluorination of 2‑pentachloropropane and 2,3,3,3‑tetrachloropropene, ,1,1,2,2‑pentachloropropane and 2,3,3,3‑tetrachloropropene to 1,1 ,1,2,2-Pentafluoropropane and 2-Chloro-1,1,1,2-Tetrafluoropropane, 1,1,1,2,2-Pentafluoropropane and 2-Chloro-1,1,1 ,2-Tetrafluoropropane Catalytic Dehydrohalogenation to Prepare 2,3,3,3-Tetrafluoropropene. The invention adopts a continuous method for reaction, the raw materials are economical and easy to obtain, and the reactions of each step are carried out in a reactor, the reaction conditions are easy to control, and the equipment operation is simple; and the conversion rate of each step of the preparation method is better, and the yield of the target product is higher , low equipment investment cost and other advantages, has a wide range of industrial application prospects.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of 2,3,3,3-tetrafluoropropene. Background technique [0002] As a new generation of refrigerant, 2,3,3,3-tetrafluoropropene has good cooling effect, small greenhouse effect, short atmospheric life, low flammability, and low toxicity. It can be widely used in refrigeration appliances such as automobiles, air conditioners, and refrigerators. It can also be used in fire extinguishing agent, foaming agent, foaming agent, grinding and polishing machine and other fields. However, compared with similar alternatives, 2,3,3,3-tetrafluoropropene is expensive to manufacture and expensive. [0003] U.S. Patent US7560602B2 discloses the CF 3 CF 2 CF 2 CHCl 2 As a raw material, first hydrodechlorination to generate CF 3 CF 2 CH 3 , and then remove HF to obtain 2,3,3,3-tetrafluoropropene. The advantage of this preparation method is that it consumes the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C21/18
CPCC07C17/08C07C17/206C07C17/25C07C17/269C07C17/278C07C19/01C07C21/04C07C19/08C07C19/10C07C21/18
Inventor 徐庆瑞王晓东吴陈兴徐煜吴业铧陈成凯胡胜伟李飞占林喜
Owner ZHEJIANG SANMEI CHEM IND
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