Method for recovering octafluoropropane from hexafluoropropylene production process

A technology of octafluoropropane and hexafluoropropene, which is applied in the field of chemical product recycling, can solve problems such as environmental pollution, increase in unit consumption, and affect the quality of system cracking and rectification, so as to achieve low operating costs, reduce unit consumption, and ensure quality. Effect

Active Publication Date: 2014-11-05
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the accumulation of time, the content of octafluoropropane in the system will increase day by day, affecting the quality of system cracking and rectification
In order to ensure the quality of cracking and rectification, when the content of octafluoropropane in the system reaches a certain level, the form of venting is used to reduce the content of octafluoropropane in the system, so that a part of hexafluoropropylene is also vented, resulting in unit consumption increase, and at the same time caused some pollution to the environment

Method used

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  • Method for recovering octafluoropropane from hexafluoropropylene production process
  • Method for recovering octafluoropropane from hexafluoropropylene production process
  • Method for recovering octafluoropropane from hexafluoropropylene production process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] like figure 1 As shown, the material gas containing octafluoropropane, hexafluoropropylene, 1-octafluorobutene, 2-octafluorobutene, and octafluorocyclobutane enters the light removal tower, and the pressure at the top of the light removal tower is controlled to 0.75MPa , the reflux ratio is 9:1, the top temperature is 15°C, the azeotrope of octafluoropropane and hexafluoropropylene is separated from other components, and the purity of octafluoropropane at the top of the tower is 83.3% (volume percentage), and hexafluoropropylene 16.7% (volume percentage), the bottom of the tower returns to the hexafluoropropylene rectification tower of the system for rectification, and the top of the tower enters the extraction tower. N-methylpyrrolidone is used as the extraction agent. The pressure at the top of the tower is controlled at 0.6MPa, and the liquid-gas ratio is 8:1 , the temperature at the top of the tower was 14°C. Octafluoropropane is obtained from the top of the tower,...

Embodiment 2

[0034] like figure 1 As shown, the material gas containing octafluoropropane, hexafluoropropylene, 1-octafluorobutene, 2-octafluorobutene, and octafluorocyclobutane enters the light removal tower, and the pressure at the top of the light removal tower is controlled to be 0.7MPa , the reflux ratio was 10:1, and the tower top temperature was 14°C. The azeotrope of octafluoropropane and hexafluoropropylene is separated from other components, and the purity of octafluoropropane at the top of the tower is 89.6% (volume percentage), and the purity of hexafluoropropylene is 10.4% (volume percentage). Distillation tower rectification, tower top enters extraction tower, extractant is the DMF solution that adds sodium chloride, and the quality of sodium chloride is 3% of DMF. The control tower top pressure is 0.55MPa, the liquid-gas ratio is 10:1, and the tower top temperature is 12°C. Octafluoropropane is obtained from the top of the tower, the recovery rate of octafluoropropane is 9...

Embodiment 3

[0036] like figure 1As shown, the material gas containing octafluoropropane, hexafluoropropylene, 1-octafluorobutene, 2-octafluorobutene, and octafluorocyclobutane enters the light removal tower, and the pressure at the top of the light removal tower is controlled to be 0.65MPa , the reflux ratio is 11:1, and the tower top temperature is 15°C. The azeotrope of octafluoropropane and hexafluoropropylene is separated from other components, and the purity of octafluoropropane at the top of the tower is 84.6% (volume percentage), and the purity of hexafluoropropylene is 15.4% (volume percentage). Distillation tower rectification, the top of the tower enters the extraction tower, the mixed solvent of toluene toluene and methanol (volume ratio 3:1) is the extraction agent, the pressure at the top of the tower is controlled at 0.5MPa, the liquid-gas ratio is 9:1, and the temperature at the top of the tower is 13 ℃. Octafluoropropane is obtained from the top of the tower, the recover...

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Abstract

The invention relates to a method for recovering octafluoropropane from the hexafluoropropylene production process and belongs to the filed of chemical product recycling. The method is characterized in that material gas enters a light component removal column, azeotrope of octafluoropropane and hexafluoropropylene in the material gas in the light component removal column is separated from other components, and octafluoropropane and hexafluoropropylene in the material gas are gathered at the column top; the material gas containing octafluoropropane and hexafluoropropylene at the column top of the light component removal column enters an extraction column for extracting, and extracting agents are used for absorbing hexafluoropropylene; column kettle materials in the extraction column enter a resolving column for resolving, high-purity hexafluoropropylene material gas obtained at the column top of the resolving column enters a hexafluoropropylene rectifying column for rectifying; and materials at the column top of the extraction column enter an octafluoropropane rectifying column for rectifying, and octafluoropropane gas is obtained at the column top of the octafluoropropane rectifying column. According to the method, a conventional rectifying device is combined with an extraction rectifying device and the extracting agents can be recycled, so that the whole production process is simple to operate, and purity of the recovered octafluoropropane is no lower than 99.999%.

Description

technical field [0001] The invention relates to a method for recovering octafluoropropane from a production process of hexafluoropropylene, belonging to the field of chemical product recycling. Background technique [0002] At present, gas etching is performed in the method of producing semiconductor devices to partially remove film materials to form circuit patterns on various film materials that can constitute semiconductor circuits, and at the same time remove deposits with cleaning gas to remove deposits deposited during film formation. Film feedstock in the reactor. One of the etching or cleaning gases commonly used in semiconductor device production processes is octafluoropropane. [0003] Hexafluoropropylene (also known as perfluoropropylene) is one of the basic raw materials of organic fluorine chemicals, and is widely used in the production of fluororubber, fluoroplastics, perfluoropropylene oxide, heptafluoropropane, and fluorosurfactants. At present, the industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/08C07C17/386C07C17/383C07C21/18
Inventor 夏俊魏文涛
Owner SHANDONG DONGYUE POLYMER MATERIAL
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