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A method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane

A technology of difluoroethane and trifluoroethane, applied in chemical instruments and methods, preparation of halogen addition, preparation of halogenated hydrocarbons, etc., can solve problems such as harsh conditions, excessive industrial waste, and restrictions

Active Publication Date: 2021-04-23
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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  • A method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane
  • A 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] 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 / min c...

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", which belongs to the field of organic chemical synthesis. This method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane is characterized in that ethylene (molecular formula CH 2 =CH 2 ) and chlorine gas (molecular formula Cl 2 ) is heated under the action of a catalyst to generate a mixture of 1,2-dichloroethane and 1,1,2-trichloroethane, which is heated with hydrogen fluoride (molecular formula HF) under the action of a fluorination catalyst to generate 1,2 ‑Difluoroethane and 1,1,2‑trifluoroethane. The invention has cheap raw materials and convenient sources; simple separation and purification of products; easy industrial production; and less industrial waste.

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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Patent Type & Authority Patents(China)
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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