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Freon 22/hexafluoropropylene azeotrope separating and recovering method

A technology of difluoro-chloromethane and hexafluoropropene is applied in the field of separation and recovery of difluoro-chloromethane/hexafluoropropene mixture, which can solve the problems of high operation energy consumption, improved recovery purity and high energy consumption, and achieves high operation efficiency. The effect of low cost, convenient operation and low energy consumption

Inactive Publication Date: 2007-11-14
阳光乐程(北京)网络科技有限公司 +4
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0020] 1. The recovered HFP product has low purity, which can only reach 90%;
[0021] 2. The content of HFP in the azeotrope is low, and the amount of frozen brine and steam required in the process of extractive distillation and extraction agent recovery is relatively large, and the energy consumption is high
This method adopts the conventional rectification method, the operation energy consumption is high, and the recovery purity needs to be further improved

Method used

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  • Freon 22/hexafluoropropylene azeotrope separating and recovering method
  • Freon 22/hexafluoropropylene azeotrope separating and recovering method
  • Freon 22/hexafluoropropylene azeotrope separating and recovering method

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Effect test

Embodiment 1

[0043] Embodiment 1: See Figure 1

[0044] Primary separation: at a temperature of 20°C and a pressure of 0.7 MPa (absolute pressure), the azeotrope of difluorochloromethane-hexafluoropropylene (the amount of matter consists of 86% of difluorochloromethane and 14% of hexafluoropropylene ) enters the primary membrane inlet absorber buffer tank 2 in a gaseous state through the pipeline 1, passes through the primary membrane separator 3 after the pressure is stabilized, the pressure difference on both sides of the membrane module is 0.2MPa, the gas residence time is 1.5 seconds, and the separation is 22 A high content of permeate gas 4 (the molar composition of the substance is R 22 96%, HFP 4%,), is introduced into secondary membrane separator 6 by pipeline; Another stream is the retentate gas 5 of HFP high content (the molar weight composition of substance is R 22 14.5%, HFP 85.5%) to the HFP extractive distillation column 9.

[0045] Secondary separation: the primary perme...

Embodiment 2

[0047] Example 2: See Figure 2

[0048] Primary separation: at a temperature of 20°C and a pressure of 0.7 MPa (absolute pressure), the azeotrope of difluorochloromethane-hexafluoropropylene (the amount of matter consists of 86% of difluorochloromethane and 14% of hexafluoropropylene ) enters the primary membrane inlet absorber buffer tank 2 in a gaseous state through the pipeline 1, and passes through the primary membrane separator 3 after adsorption and pressure stabilization. The pressure difference between the two sides of the membrane module is 0.2MPa, and the gas residence time is 1.5 seconds. 22 A high content of permeate gas 4 (the molar composition of the substance is R 22 96%, HFP 4%,), after decompression directly returns to TFE compression recovery system; 22 14.5%, HFP 85.5%), condensed by the retentate gas condenser 20, and collected into the retentate gas intermediate tank 21.

[0049] Extractive distillation: After the retentate gas is heated and pressurize...

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Abstract

This invention relates to a separation and recovery method of chlorodifluoromethane / hexafluoropropylene azeotrope. The invention adopts one or multilevel membrane separation process. The chlorodifluoromethane / hexafluoropropylene azeotrope transits first order gas separation membrane assembly by gaseity; permeating gas that rich in chlorodifluoromethane enter secondary membrane separation assembly, then reclaimd to compressor first order import buffer tank of tetrafluoroethylene production process; the removeing extraction rectifier unit of firsts and seconds seeping residual air that rich in hexafluoropropylene could gain hexafluoropropylene that purity is greater than 99.9%.

Description

technical field [0001] The invention relates to a method for separating and recovering difluorochloromethane (R22) / hexafluoropropylene (HFP) mixture. Background technique [0002] Fluorine is the first element of the VII main group, with the largest electronegativity and small atomic radius. The van der Waals radius is 0.135nm, which is only slightly larger than the van der Waals radius of 0.12nm for hydrogen atoms. Fluorine atoms are substituted to form a large number of organic fluorine compounds. Due to the large electronegativity of fluorine, small atomic radius, low polarizability of fluorine-carbon bond and weak intermolecular force, the introduction of fluorine into organic compounds is often accompanied by significant changes in physical and chemical properties, and has various special properties. Therefore, organic fluorine compounds have been widely used in various fields of national economy. At present, organic fluorine products produced on a large scale include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/10C07C17/38B01D53/22
CPCY02P20/40
Inventor 单杰王新平谢建平胡经宇吕军旗
Owner 阳光乐程(北京)网络科技有限公司
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