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A kind of 1,1,1,3-tetrachloropropane liquid-phase dehydrochlorination to produce 1,1,3-trichloropropene and catalyst recovery method

A tetrachloropropane liquid, dehydrochlorination technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, chemical recovery, etc., can solve the problem of easy decomposition, high processing cost, high energy consumption, etc. problems, to achieve the effects of reducing hazardous waste emissions, easy industrialization, and low process energy consumption

Active Publication Date: 2022-04-12
常州新东化工发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, 1,1,1,3-tetrachloropropane is prepared by dehydrochlorination with lye under the action of a phase transfer catalyst. This method produces a lot of salty wastewater and waste solids, and the treatment cost is high.
CN110511112A discloses a gas-phase 1,1,1,3-tetrachloropropane empty pipe cracking technology, but the gas-phase dehydrochlorination reaction temperature is high, energy consumption is large, the material is easily decomposed at high temperature, and coke deposits on the pipe wall affect heat transfer
CN110511112A uses molecular sieve-supported catalyst gas-phase catalytic dehydrochlorination to prepare 1,1,3-trichloropropene, but because the olefin produced is unstable at high temperature, it is easy to coke on the surface of the catalyst, resulting in frequent regeneration of the catalyst, and the high-temperature regeneration process is prone to light gas
CN103119005A and CN105026346A respectively disclose aluminum trichloride and ferric chloride to catalyze 1,1,1,3-tetrachloropropane liquid-phase dehydrochlorination technology, because the activity of the two catalysts is high, the high boiling produced in the reaction is more, In addition, aluminum trichloride and ferric chloride are used for homogeneous catalyst dehydrochlorination. Because the catalyst is easily hydrolyzed and unstable, it is difficult to separate the catalyst from the system. Increased the processing cost of "three wastes"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 5.1 kg of 1,1,1,3-tetrachloropropane into a 5L glass reactor, and add iron p-toluenesulfonate according to the mass ratio of catalyst and 1,1,1,3-tetrachloropropane at 4.5:100 , start stirring, and heat the material to 80.4°C for dehydrochlorination, and the hydrogen chloride generated in the reaction is absorbed by water. The reaction was stopped after 0.5h. After the reaction solution was cooled to room temperature, sampling and analysis were carried out. The conversion rate of the raw material 1,1,1,3-tetrachloropropane was 90.3%, and the selectivity of the product 1,1,3-trichloropropene was 98.1%. High boil about 1.2%. The catalyst was extracted and recovered by adding ethylene glycol extractant at a mass ratio of 20:1 to the catalyst, and the extract was rectified under reduced pressure to obtain 1,1,3-trichloropropene with a purity of 99.8%, and the yield was 87%.

Embodiment 2

[0027] Add 5.1 kg of 1,1,1,3-tetrachloropropane into a 5L glass reactor, and add iron p-toluenesulfonate according to the mass ratio of catalyst and 1,1,1,3-tetrachloropropane at 0.05:100 , start stirring, and heat the material to 145°C for dehydrochlorination, and the hydrogen chloride generated in the reaction is absorbed by water. The reaction was stopped after 4.5 hours. After the reaction solution was cooled to room temperature, a sample was taken for analysis. The conversion rate of the raw material 1,1,1,3-tetrachloropropane was 87.9%, and the selectivity of the product 1,1,3-trichloropropene was 98.6%. High boiling about 0.8%. The catalyst was extracted and recovered by adding ethylene glycol extractant at a mass ratio of 80:1 to the catalyst, and the extract was rectified under reduced pressure to obtain 1,1,3-trichloropropene with a purity of 99.7%, and the yield was 85%.

Embodiment 3

[0029] Add 5.1 kg of 1,1,1,3-tetrachloropropane into a 5L glass reactor, and add iron p-toluenesulfonate according to the mass ratio of catalyst and 1,1,1,3-tetrachloropropane at 0.5:100 , start stirring, and heat the material to 110°C for dehydrochlorination, and the hydrogen chloride generated in the reaction is absorbed by water. The reaction was stopped after 3.0 hours. After the reaction solution was cooled to room temperature, a sample was taken for analysis. The conversion rate of the raw material 1,1,1,3-tetrachloropropane was 92.9%, and the selectivity of the product 1,1,3-trichloropropene was 98.3%. High boiling about 0.9%. Water extractant was added at a mass ratio of 50:1 to the catalyst to extract and recover the catalyst, and the extract was rectified under reduced pressure to obtain 1,1,3-trichloropropene with a purity of 99.8%, and the yield was 90%.

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Abstract

The invention discloses a method for producing 1,1,3-trichloropropene by liquid-phase homogeneous catalyzed dehydrochlorination of 1,1,1,3-tetrachloropropane. In a tank reactor, 1,1,1,3-tetrachloropropane is heated and dehydrochlorinated to produce 1,1,3-trichloropropene, and after the reaction, an extractant is added to recover the catalyst iron p-toluenesulfonate. The catalyst of the invention has good activity, high selectivity, easy separation and reuse, and is environmentally friendly. After the reaction is completed, the catalyst is extracted and recovered by using a solvent, reducing waste solid discharge, and the activity of the recovered catalyst remains unchanged.

Description

technical field [0001] The invention relates to a method for liquid-phase dehydrochlorination of 1,1,1,3-tetrachloropropane, in particular to a liquid-phase dehydrochlorination of 1,1,1,3-tetrachloropropane to produce 1,1,3-trichloropropene and Catalyst recovery method. Background technique [0002] 1,1,3-Trichloropropene is a colorless liquid at normal temperature and pressure, with a density of 1.376g / cm 3 , with a boiling point of 131.5°C, it is an important intermediate for the synthesis of 2,3,3,3-tetrafluoropropene (HFO-1234yf), a new environmentally friendly refrigerant. With the emergence of ozone depletion and global warming, HFO-1234yf, a new environmentally friendly refrigerant, will gradually replace CFCs and HCFCs. [0003] Currently, 1,1,3-trichloropropene is mainly prepared by dechlorination of 1,1,1,3-tetrachloropropane. For example, 1,1,1,3-tetrachloropropane is prepared by dehydrochlorination with lye under the action of a phase transfer catalyst. This m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/25C07C21/04C07C303/44C07C309/30B01J31/02
CPCC07C17/25C07C303/44B01J31/0225C07C21/04C07C309/30Y02P20/584
Inventor 张驰朱成明王顺利孙运林刘向超吴发明马凯董亮陶文平
Owner 常州新东化工发展有限公司
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