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Method for separating fluorine hydride from 1,1-difluoroethane production

A technology of difluoroethane and hydrogen fluoride, applied in the field of separation, can solve the problems of high energy consumption, consumption of industrial water and lye, high cost, and achieve the reduction of consumption of rectification system, reduction of use and replacement, and low water content of products. Effect

Inactive Publication Date: 2009-04-29
CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, acetylene and hydrogen fluoride are mainly used to produce 1,1-difluoroethane in the liquid phase. The crude 1,1-difluoroethane produced contains a small amount of impurities such as hydrogen fluoride, which affects the purity of the finished product.
[0003] At present, hydrogen fluoride in crude 1,1-difluoroethane is mainly removed by water washing and alkali washing. This separation method consumes a large amount of industrial water and lye, and the cost is high, and dissolved oxygen will be brought into the water, so that Oxygenates the product while entraining
[0004] The moisture makes the follow-up rectification system consume a lot of energy, and makes the product moisture too high. The molecular sieve is used and replaced frequently, and the cost is high.

Method used

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  • Method for separating fluorine hydride from 1,1-difluoroethane production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ethylenediamine is used as the liquid amine absorbent.

[0023] In the method for separating hydrogen fluoride in the production of 1,1-difluoroethane provided by Example 1 of the present invention, open the absorbent feed port (14), put a certain amount of absorbent in the tower kettle and then close it, and open the circulation pump (15), the absorbent flows out of the absorption tower (1) from the absorbent outlet (7), enters the absorption tower from the absorbent inlet (6) arranged on the top of the tower and moves downward, and opens the gas material inlet (4). The gas material (1,1-difluoroethane gas containing a small amount of hydrogen fluoride) from the top of the collection tower enters the absorption tower (1) under the action of the system pressure difference, opens the steam inlet (3), and controls the absorption tower (1) tower The pressure of the kettle is 0.3MPa, the temperature of the tower kettle is controlled at 20°C, the gas material moves upwards, ...

Embodiment 2

[0025] Triethylamine was used as the liquid amine absorbent.

[0026] In the method for separating hydrogen fluoride in the production of 1,1-difluoroethane provided in Example 2 of the present invention, open the absorbent feed port (14), put a certain amount of absorbent in the tower kettle and close it, and open the circulation pump (15), the absorbent flows out of the absorption tower (1) from the absorbent outlet (7), enters the absorption tower from the absorbent inlet (6) arranged on the top of the tower and moves downward, opens the gas material inlet (4), and recovers The gas material (1,1-difluoroethane gas containing a small amount of hydrogen fluoride) from the top of the tower enters the absorption tower (1) under the action of the system pressure difference, opens the steam inlet (3), and controls the absorption tower (1) tower tank The pressure is 0.6MPa, the temperature of the tower is controlled at 80°C, the gas material moves upwards, and the reverse vapor-li...

Embodiment 3

[0028] Tri-n-butylamine is used as the liquid amine absorbent.

[0029] In the method for separating hydrogen fluoride in the production of 1,1-difluoroethane provided in Example 3 of the present invention, the absorbent feeding port (14) is opened, a certain amount of absorbent is loaded into the tower kettle and then closed, and the circulation pump is opened (15), the absorbent flows out of the absorption tower (1) from the absorbent outlet (7), enters the absorption tower from the absorbent inlet (6) arranged on the top of the tower and moves downward, opens the gas material inlet (4), and recovers The gas material (1,1-difluoroethane gas containing a small amount of hydrogen fluoride) from the top of the tower enters the absorption tower (1) under the action of the system pressure difference, opens the steam inlet (3), and controls the absorption tower (1) tower tank The pressure is 0.52MPa, the temperature of the tower is controlled at 40-45°C, the gas material moves upw...

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Abstract

The invention provides a method for separating hydrogen fluoride in a 1, 1-difluoroethane production process. The method comprises that: a liquid amine type absorbent is used for absorbing the hydrogen fluoride gas in the 1, 1-difluoroethane gas containing little amount of difluoroethane. The method for separating difluoroethane in the production of the 1, 1-difluoroethane is characterized in that the liquid amine type absorbent which does not affect the product yield and the purity of the products is used for absorbing hydrogen fluoride. The invention relates to a dry separation method which does not lead into moisture content, causes the product not to carry extra moisture content and oxygen, the consumption of the successive rectification system to reduce greatly and the use and replacement of molecular sieve to reduce greatly; in addition, the water content of the product is lower and the purity is higher.

Description

technical field [0001] The invention relates to a separation method, in particular to a method for separating hydrogen fluoride in the production of 1,1-difluoroethane. Background technique [0002] At present, the production method of 1,1-difluoroethane mainly adopts liquid phase production of acetylene and hydrogen fluoride, and the crude 1,1-difluoroethane produced contains a small amount of impurities such as hydrogen fluoride, which affects the purity of the finished product. [0003] At present, hydrogen fluoride in crude 1,1-difluoroethane is mainly removed by water washing and alkali washing. This separation method consumes a large amount of industrial water and lye, and the cost is high, and dissolved oxygen will be brought into the water, so that Oxygenates the product while entraining [0004] The moisture makes the follow-up rectification system consume a lot of energy, and makes the product moisture high, and the molecular sieve is frequently used and replaced,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/395
Inventor 朱余民邓志刚
Owner CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS
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