Double line rectification method of hexafluoropropene production cracking gas, and rectification apparatus thereof

A technology of hexafluoropropylene and cracked gas, applied in the field of rectification, can solve the problems of product purity not meeting requirements, low equipment utilization rate, leakage of highly toxic substances, etc., achieving high safety and environmental protection benefits, improving equipment utilization efficiency, and improving The effect of product quality

Active Publication Date: 2015-07-22
福建三农新材料有限责任公司
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Problems solved by technology

[0003] Regarding the rectification method for the production of cracked gas from hexafluoropropylene, it is currently a single-line rectification method to gradually extract light components, using 5 towers, 1# tower to recover tetrafluoroethylene (TFE), and 2# tower to further remove light components Part, 3# tower collects hexafluoropropylene (HFP) product, 4# tower further recycles HFP product, 5# tower recycles octafluorocyclobutane (C318), step by step extraction, heavy component and highly toxic component participate in rectification repeatedly , not only lead to the risk of leakage of highly toxic substances in 1#, 2#, 4#, and 5# rectification column kettles, but also high energy consumption, low equipment utilization rate, high unit consumption, and product purity that cannot meet the requirements

Method used

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  • Double line rectification method of hexafluoropropene production cracking gas, and rectification apparatus thereof

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Effect test

Embodiment 1

[0027] The cracked gas from the production of hexafluoropropylene is fed into the high boiler removal tower 1 for preliminary separation of light and heavy components. and the light component take the following two lines respectively:

[0028] 1. Heavy component (including C 4 f 8 and other highly toxic components) are separated from the tower still of the high boiler removal tower 1, and then carry out raffinate separation and C318 rectification tower 3 through the raffinate separation tower 3 to carry out C318 rectification, and the pressure of the raffinate separation tower 2 is 0.2 ~0.4MPa, the temperature is 30~60°C, the pressure of the C318 rectification tower 3 is 0.1~0.3MPa, the temperature is 20~30°C, and the octafluorocyclobutane with a purity greater than 99.8% is obtained;

[0029]2. Light components (including low-toxic components such as TFE and HFP) are separated from the top of the 1# tower, and enter the compressor 4 through the compression buffer tank 8, an...

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Abstract

The invention relates to a double line rectification method of hexafluoropropene production cracking gas, and a rectification apparatus thereof. The double line rectification method adopting 6 rectifications and two-time compression is carried out to separate light components from heavy components and separate low toxicity components and severe toxicity components, and new technologic control parameters are adopted, so the quantity of devices containing severe toxicity octafluoroisobutylene is greatly reduced, the safety level of the apparatus is improved, the HFP (hexafluoropropene) product quality is improved, energy consumption is reduced, the production power of the apparatus is improved, the production cost is reduced, the apparatus utilization efficiency is improved, the unit consumption is reduced, and the apparatus and the method have very high safety, environmental protection energy saving and consumption reduction benefits.

Description

technical field [0001] The invention relates to the technical field of rectification, in particular to a double-line rectification method and rectification equipment for producing pyrolysis gas from hexafluoropropylene. Background technique [0002] Hexafluoropropylene (HFP) is a colorless and odorless gas, slightly soluble in ethanol and ether. Hexafluoropropylene is obtained by thermal cracking of tetrafluoroethylene. Generally, tetrafluoroethylene (TFE) and octafluorocyclobutane (C318) are mixed uniformly in a certain proportion, preheated and then input into a segmented heating tubular reactor for cracking. reaction, the cracked gas produced by its cracking is quenched, deacidified, dried, and compressed, then sent to the downstream rectification system, and separated by rectification to obtain hexafluoropropylene, such as the "production method of hexafluoropropylene" disclosed in CN1273427C. [0003] Regarding the rectification method for the production of cracked gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/383
Inventor 徐美燚徐万鑫项冬梅
Owner 福建三农新材料有限责任公司
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