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Method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane

A technology for difluoroethane and trifluoroethane is applied in the field of synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane, and can solve the problem of many industrial wastes, long synthesis routes and expensive raw materials and other problems, to achieve the effect of wide source of raw materials, high product yield and convenient source.

Active Publication Date: 2020-05-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports, the shortcomings of long synthetic route, harsh conditions, expensive raw materials, and many industrial wastes limit the large-scale industrial production of 1,2-difluoroethane and 1,1,2-trifluoroethane

Method used

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  • Method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane
  • Method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Adopt the co-precipitation method to prepare the addition catalyst, the steps are as follows:

[0026] Ni(NO 3 ) 3 , Al(NO 3 ) 3 The solutions were mixed, and 30 wt% ammonia water was added dropwise to the mixed solution to adjust the pH to 7.0. Precipitation is filtered, washed with deionized water, dried, and pressed into shape to obtain the addition catalyst precursor Ni-Al.

[0027] Put 20ml of addition catalyst Ni-Al precursor into the fixed bed reactor, and the fixed bed reactor is heated with an open tube heating furnace. The catalyst was dried at a temperature of 500°C at a rate of 1°C / min under the protection of 100ml / min nitrogen for 10 hours, and then the temperature was lowered to 200°C. This completes the drying process of the addition catalyst.

[0028] Reactor is heated to 200 ℃, 100ml / min nitrogen and 20ml / min chlorine activate catalyst for 10 hours; 100ml / min nitrogen and 50ml / min chlorine activate catalyst for 10 hours; 50ml / min chlorine and ...

Embodiment 2

[0038] (1) Adopt the co-precipitation method to prepare the addition catalyst, the steps are as follows:

[0039] Ni(NO 3 ) 3 , Ca(NO 3 ) 2 The solutions were mixed, and 30 wt% ammonia water was added dropwise to the mixed solution to adjust the pH to 10.0. Precipitation is filtered, washed with deionized water, dried, and pressed into shape to obtain the addition catalyst precursor Ni-Ca.

[0040] Add 20ml of the addition catalyst Ni-Ca precursor into the fixed bed reactor, and the fixed bed reactor is heated with an open tube heating furnace. The catalyst was dried at a temperature of 500°C at a rate of 1°C / min under the protection of 100ml / min nitrogen for 10 hours, and then the temperature was lowered to 200°C. This completes the drying process of the addition catalyst.

[0041] Heat the reactor to 200°C, activate the catalyst with 100ml / min nitrogen and 20ml / min chlorine for 10 hours; 100ml / min nitrogen and 50ml / min chlorine activate the catalyst for 10 hours; 50ml / ...

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Abstract

The invention relates to a method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane, belonging to the field of organic chemical synthesis. The method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane is characterized in that ethylene (with a molecular formula of CH2=CH2) and chlorine (with a molecular formula of Cl2) are heated under the action of a catalyst to generate a mixture of 1,2-dichloroethane and 1,1,2-trichloroethane, and the mixture and hydrogen fluoride (with a molecular formula HF) are heated under the action of a fluorination catalyst to generate 1,2-difluoroethane and 1,1,2-trifluoroethane. According to the method, raw materials are low in process and convenient to obtain; product separation and purification are simple; industrial production is easy;and industrial three-waste generation amount is low.

Description

technical field [0001] The invention is a method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane, which relates to an easy industrial method for synthesizing 1,2-difluoroethane and 1,1,2- Trifluoroethane. Background technique [0002] As fluorine-containing compounds, 1,2-difluoroethane and 1,1,2-trifluoroethane have high industrial value and are widely used industrial raw materials. It is mainly used in refrigerants, aerosol propellants and organic synthesis intermediates. [0003] There are few reports about the synthesis route of 1,2-difluoroethane. Daikin Corporation of Japan (patent US2019169101) reported a method for generating 1,2-difluoroethane from chlorotrifluoroethylene under the action of 0.5% Pd catalyst and hydrogen at 150°C. The method adopts chlorotrifluoroethylene which is not easy to be produced in industry, which increases the cost of industrialization. Literature (Journal of the American Chemical Society, 1936, vol.58, p.886) reported a ...

Claims

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Application Information

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IPC IPC(8): C07C17/20C07C19/08
CPCC07C17/02C07C17/206C07C19/08C07C19/045C07C19/05
Inventor 周彪柯巍孙绪坤
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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