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Separation method of hexafluoropropylene and monochlorodifluoromethane (F22) mixture

A technology of difluoromonochloromethane and hexafluoropropylene, which is applied in the directions of absorption purification/separation, organic chemistry, etc., can solve the problems of secondary pollution of waste solvent, complicated process flow, and large amount of entrained solvent, and achieve the effect of environmental friendliness

Active Publication Date: 2013-12-25
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the process is complicated, the amount of entrained solvent in the recovered difluorochloromethane is large, the operation cost is high, and the waste solvent will cause secondary pollution.

Method used

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  • Separation method of hexafluoropropylene and monochlorodifluoromethane (F22) mixture
  • Separation method of hexafluoropropylene and monochlorodifluoromethane (F22) mixture
  • Separation method of hexafluoropropylene and monochlorodifluoromethane (F22) mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Will F 22 ~C 3 f 6 The azeotrope (containing 83.88% by volume of F 22 and 16.12 volume percent C 3 f 6 ) is sent to the absorption equipment (2) at a flow rate of 100Kg / h, and the circulating water circulating from the desorption equipment is sent to the upper part of the absorption equipment (2) at a flow rate of 10,000kg / h, so that the circulating water absorbs F22, and the absorption equipment (2) The model is DN150mm×4000mm, the operating temperature is 40°C, and the pressure is 0.45MPa.

[0047] the absorbed F 22 The water is taken out from the bottom of the absorption device (2) and sent to the desorption device (3) for desorption, and the water separated from the top of the desorption device (3) is expressed as F 22 The main mixture is sent back to the cracked gas storage tank. The model of the desorption device (3) is DN150mm×4000mm, the operating pressure is 0.02MPa, and the temperature is 70°C.

[0048] Send the gas that has been absorbed and washed on...

Embodiment 2

[0055] Will F 22 ~C 3 f 6 The azeotrope (containing 83.88% by volume of F 22 and 16.12 volume percent C 3 f 6 ) is sent to the absorption equipment (2) with a flow rate of 100Kg / h, and the deionized water circulating from the desorption equipment is sent to the top of the absorption equipment (2) with a flow rate of 10000kg / h, so that the deionized water absorbs F22, absorbs The model of the equipment (2) is DN150mm×4000mm, the operating temperature is 40°C, and the pressure is 0.45MPa.

[0056] the absorbed F 22 The deionized water is taken out from the bottom of the absorption device (2) and sent to the desorption device (3) for desorption, and the deionized water separated from the top of the desorption device (3) is desorbed as F 22 The main mixture is sent back to the cracked gas storage tank. The model of the desorption device (3) is DN150mm×4000mm, the operating pressure is 0.02MPa, and the temperature is 70°C.

[0057] The gas that has been absorbed and washed ...

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PUM

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Abstract

The invention discloses a separation method of a hexafluoropropylene and monochlorodifluoromethane (F22) mixture, and the separation method comprises the following steps of: (1) providing a reaction mixture which comprises hexafluoropropylene and F22; (2) adding water to the reaction mixture in a weight ratio of water to the reaction mixture being (30:1)-(150:1), and adsorbing F22 from the mixture under the pressure of 0.2-1.0 Mpa to obtain F22 solution and hexafluoropropylene gas; (3) desorbing the F22 solution under the pressure of 0.01-0.1 Mpa to obtain F22 gas; (4) adding water to the reaction mixture in a weight ratio of water to the desorbed F22 being (4:1)-(20:1), and adsorbing F22 from the mixture under the pressure of 0.2-1.0 Mpa to obtain F22 solution and hexafluoropropylene gas; and (5) desorbing the F22 solution under the pressure of 0.01-0.1 Mpa to obtain F22 gas. The separation method disclosed by the invention has the advantages of simple recovery and separation process, low recovery operation cost, no environmental pollution and high purity of recovered hexafluoropropylene and dichlorodifluoromethane, and increases the selectivity of tetrafluoroethylene after high-temperature pyrolysis of F22.

Description

technical field [0001] The present invention relates to a kind of hexafluoropropylene (C 3 f 6 ) and difluorochloromethane (F 22 ) separation method of the mixture. More specifically, the present invention relates to tetrafluoroethylene (C 2 f 4 ) tail gas (hexafluoropropylene (C 3 f 6 ), difluorochloromethane (F 22 ), dichlorodifluoromethane (F 12 ) and other mixtures) to recover hexafluoropropylene (C 3 f 6 ) and difluorochloromethane (F 22 )Methods. Background technique [0002] Polytetrafluoroethylene (PTFE for short) is a material with excellent performance. It is resistant to aging, has good chemical stability, excellent electrical insulation and good lubricity, and has a wide range of operating temperatures. It is widely used in various industries. Polytetrafluoroethylene is made of monomer tetrafluoroethylene (C 2 f 4 ) polymerized, the monomer tetrafluoroethylene commonly used difluorochloromethane (F 22 ) prepared by high temperature pyrolysis, pyrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/11C07C21/18C07C19/10
Inventor 刘越鹏唐杰张志刚谈臻沈颖浩
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD