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Method and equipment for recovering F22 and hexafluoro propylene in tetrafluoroethylene production

A technology for tetrafluoroethylene and hexafluoropropylene is applied in the fields of recovering difluoromonochloromethane and recovering and separating hexafluoropropylene, which can solve the problems of long process and complicated operation.

Active Publication Date: 2007-07-18
SHANDONG DONGYUE POLYMER MATERIAL
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Problems solved by technology

The above-mentioned traditional process has a long process and complicated operation, which brings a lot of inconvenience to the actual production

Method used

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  • Method and equipment for recovering F22 and hexafluoro propylene in tetrafluoroethylene production

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Embodiment 1

[0041] Taking the 5,000-ton device as an example, the process is located after the raffinate tower, and the exhaust gas from the top of the raffinate tower enters the first F22, C 3 f 6 Separation membrane, the permeate gas passing through the first membrane is mainly difluorochloromethane, and its purity can reach 96%-99%. This part of the permeate gas is condensed by the 1# condenser and then recycled to the low-pressure gas cabinet of the monomer workshop Participate in cracking, and the retentate gas enters the second separation membrane. The purity of difluorochloromethane in the permeate gas passing through the second separation membrane is 86%-92%. This part of the permeate gas returns to the first membrane through the 1# buffer tank and compressor for secondary separation, and the retentate gas continues Enter the third separation membrane. The purity of difluorochloromethane in the permeate gas passing through the third membrane is 75%-80%, and this part of permeate...

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Abstract

This invention relates to a process of recover di-fluorine- monochloromethane and hexafluoro-propylene (HFP) from Tetrafluoroethylene production. The feature is using F22, C3F6 membrane. It used F22, C3F6 membrane replace azeotropic tower, HFP absorber, resolution tower to recover exhaust residue of di-fluorine- monochloromethane(F22) and HFP (C3F6). This invention has high recovery rate, can reduce energy consumption and costs. The invention also provides equipment of achieving the aforementioned method.

Description

Technical field: [0001] The invention belongs to the field of fluorine chemical industry, and relates to the recovery of difluorochloromethane (F22) and the recovery and separation of hexafluoropropylene (C 3 f 6 ) method and apparatus. Background technique: [0002] Tetrafluoroethylene is currently the largest and most important fluorine-containing monomer in production. It is the raw material of polytetrafluoroethylene, the comonomer of many fluorine-containing copolymers, and the intermediate of various fluorine-containing compounds. The production level of tetrafluoroethylene represents the development level of a country's organic fluorine industry. [0003] Tetrafluoroethylene was first seen in 1933 when Ruff et al. thermally decomposed carbon tetrafluoride in a carbon arc. But the real realization of industrialization was after the discovery of polytetrafluoroethylene. In 1945, J.D. Park et al. proposed the method of preparing tetrafluoroethylene by pyrolyzing diflu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C19/10C07C21/18B01D71/32
Inventor 宋学章孙明珠于昌国郝宏伟孙芳
Owner SHANDONG DONGYUE POLYMER MATERIAL
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