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Recovery method of trifluoromethane

A technology of trifluoromethane and difluoromonochloromethane is applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry, etc., and can solve problems such as environmental pollution, high production cost, ozone layer destruction, etc.

Active Publication Date: 2007-07-18
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of trifluoromethane by-product is about 3% (weight ratio) in the crude product of HCFC-22 generated, but due to the large annual output of HCFC-22 in the world, the trifluoromethane by-product generated every year reaches several thousand tons. These trifluoromethane Most of the methane is directly discharged into the atmosphere without recycling or treatment, causing environmental pollution and ozone layer damage
However, the reaction is carried out in a gold reaction vessel, and the production cost is very high

Method used

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  • Recovery method of trifluoromethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The exhaust gas (composed of difluorochloromethane: trifluoromethane = 65: 35 (weight ratio)) from the exhaust tower of the difluorochloromethane plant first enters the degassing tower after being compressed by the compressor, and the degassing tower The temperature is 25°C and the pressure is 3.5MPa. , to separate difluorochloromethane and trifluoromethane; then the separated crude trifluoromethane enters the rectification tower, the temperature of the rectification tower is 25° C., and the pressure is 3.5 MPa. Trifluoromethane with a purity of >99.5% is obtained. At the same time, difluorochloromethane with a purity of ≥95% was recovered. The trifluoromethane product from the top of the rectification tower is cooled and liquefied by the product condenser, and then collected in the trifluoromethane product tank. The condensing temperature of the finished condenser is 0°C, and the condensing pressure is 3.5MPa.

Embodiment 2

[0033] The exhaust gas (composed of difluorochloromethane: trifluoromethane = 65: 35 (weight ratio)) from the exhaust tower of the difluorochloromethane plant first enters the degassing tower after being compressed by the compressor, and the degassing tower The temperature is 30°C and the pressure is 4.5MPa. , to separate difluorochloromethane and trifluoromethane; then the separated crude trifluoromethane enters the rectification tower, the temperature of the rectification tower is 20°C, and the pressure is 3.5MPa. Trifluoromethane with a purity of >99.5% is obtained. At the same time, difluorochloromethane with a purity of ≥95% was recovered. The trifluoromethane product from the top of the rectification tower is cooled and liquefied by the product condenser, and then collected in the trifluoromethane product tank. The condensing temperature of the finished condenser is -10°C, and the condensing pressure is 4.5MPa.

Embodiment 3

[0035] The exhaust gas (composed of difluorochloromethane: trifluoromethane = 65: 35 (weight ratio)) from the exhaust tower of the difluorochloromethane plant first enters the degassing tower after being compressed by the compressor, and the degassing tower The temperature is 40°C and the pressure is 4.5MPa. , to separate difluorochloromethane and trifluoromethane; then the separated crude trifluoromethane enters the rectification tower, the temperature of the rectification tower is 20°C, and the pressure is 3.5MPa. Trifluoromethane with a purity of >99.5% is obtained. At the same time, difluorochloromethane with a purity of ≥95% was recovered. The trifluoromethane product from the top of the rectification tower is cooled and liquefied by the product condenser, and then collected in the trifluoromethane product tank. The condensing temperature of the finished condenser is -10°C, and the condensing pressure is 4.5MPa.

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Abstract

This invention provides a fluoform separation and recovery methods. Produce di-fluorine- monochloromethane emptying gas, after compressor compressed enter the first degasser tower; T obtain crude fluoform and di-fluorine- monochloromethanehe by isolating in degasser tower; put crude fluoform into distillation tower for distillation, obtain fluoform of purity 99.5% ~ 100%; after condenser cooling and liquefaction, collect the products in a finished fluoform slot. This invention not only recovers fluoform to protect the environment, also recover di-fluorine- monochloromethane, and create a direct economic benefit. The invention also provides equipment of realize the methods, including: a compressor, degasser tower, distillation tower, refined tower, finished product condenser, fluoform finished product slot.

Description

technical field [0001] The invention belongs to the field of refrigerants, and relates to a method for recovering trifluoromethane, in particular to subjecting the exhaust gas of the tail gas tower of a difluorochloromethane device to a separation process of difluorochloromethane and trifluoromethane and purification of trifluoromethane Trifluoromethane with a purity of 99.5% was obtained after the process. Background technique [0002] Trifluoromethane (CHF 3 , HFC-23) is the reaction of HF and chloroform to generate difluorochloromethane (CHF 2 Cl, a by-product of HCFC-22). It is a major source of perfluoroolefins such as tetrafluoroethylene (TFE). It can be used as a refrigerant and a raw material for the preparation of high-efficiency and low-toxic fire extinguishing agent bromotrifluoromethane. The content of trifluoromethane by-product is about 3% (weight ratio) in the crude product of HCFC-22 generated, but due to the large annual output of HCFC-22 in the world, t...

Claims

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Application Information

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IPC IPC(8): C07C19/08C07C17/383
Inventor 庞峰宋淑伟马永安
Owner SHANDONG DONGYUE CHEM
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