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Method for purifying tetrafluoroethylene from pyrolysis gas

A technology for purifying tetrafluoroethylene and pyrolysis gas, applied in the field of tetrafluoroethylene separation and purification, can solve the problem of high energy consumption, and achieve the effects of lowering the temperature of the tower kettle, lowering the energy consumption and reducing the pressure drop

Inactive Publication Date: 2016-12-14
天津市振津石油天然气工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purity of tetrafluoroethylene produced by this process device is less than 99.99%, and the energy consumption is relatively high

Method used

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  • Method for purifying tetrafluoroethylene from pyrolysis gas
  • Method for purifying tetrafluoroethylene from pyrolysis gas
  • Method for purifying tetrafluoroethylene from pyrolysis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Purification of 2300 kg per hour raw materials containing tetrafluoroethylene, the feed composition is as follows: trifluoromethane 0.08%, hexafluoroethane 0.002%, tetrafluoroethylene 45%, difluoromethane 0.418%, difluorochloromethane 39.5% , Hexafluoropropylene 15%.

[0026] Operating conditions of each tower in the process flow

[0027]

[0028]

[0029] Note: After the heat exchange of raw materials, the temperature of entering the tower is 4°C

[0030] The main indicators of the phenazine product produced under the above-mentioned process conditions are as follows:

[0031]

Embodiment 2

[0033] Purification of 2300 kg per hour raw materials containing tetrafluoroethylene, the feed composition is as follows: trifluoromethane 0.1%, hexafluoroethane 0.0015%, tetrafluoroethylene 51.2%, difluoromethane 0.0985%, difluorochloromethane 38.2% , Hexafluoropropylene 10.4%.

[0034] Operating conditions of each tower in the process flow

[0035]

light tower

Refining tower

tower type

packed tower

packed tower

packing type

Stainless steel wire mesh structured packing

Stainless steel wire mesh structured packing

Theoretical progression

80

80

Operating pressure at the top of the tower (absolute pressure) / Kpa

1300

1200

Reflux ratio

1.1

1.1

[0036] Note: After the heat exchange of raw materials, the temperature of entering the tower is 4°C

[0037] The main indicators of tetrafluoroethylene products produced under the above process conditions are as follows:

[0038]

Embodiment 3

[0040] Purification of 2300kg per hour raw materials containing tetrafluoroethylene, the feed composition is as follows: trifluoromethane 0.35%, hexafluoroethane 0.05%, tetrafluoroethylene 60%, difluoromethane 1%, difluorochloromethane 30% , Hexafluoropropylene 8.6%.

[0041] Operating conditions of each tower in the process flow

[0042]

[0043]

[0044] Note: After the heat exchange of raw materials, the temperature of entering the tower is 4°C

[0045] The main indicators of tetrafluoroethylene products produced under the above process conditions are as follows:

[0046]

[0047] It can be seen from the above table that the present invention is feasible, and the whole separation process not only has simple process operation, low energy consumption, but also high separation efficiency.

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Abstract

The invention relates to a method for purifying tetrafluoroethylene from pyrolysis gas. A light component removal tower and a refining tower are adopted. The light component removal tower is provided with a tower top condenser and a tower kettle reboiler. The refining tower is provided with a tower top condenser and a tower kettle reboiler. Pyrolysis gas raw material liquid containing tetrafluoroethylene enters the upper portion of the light component removal tower, light components such as trifluoromethane and hexafluoroethane are removed, the tower kettle material enters the middle of the refining tower, heavy components such as difluoromethane, monochlorodifluoromethane and hexafluoropropylene are removed at the tower kettle, the light components are removed at the tower top, and the tetrafluoroethylene product is obtained from the side line. According to the light component removal tower, the operation pressure at the top is 1100-1600 Kpa, the reflux ratio is 0.5-3, and the number of theoretical stages is 50-100; according to the refining tower, the operation pressure at the top is 1000-1500 Kpa, the reflux ratio is 0.5-3, and the number of theoretical stages is 50-100. Continuous operation is adopted, and system energy consumption is lowered. The purity of the produced tetrafluoroethylene product is larger than or equal to 99.999%, and difluoromethane is smaller than or equal to 0.0005%.

Description

technical field [0001] The invention relates to a method for separating and purifying tetrafluoroethylene, in particular to a method for separating high-purity tetrafluoroethylene from treated pyrolysis gas, and belongs to the field of tetrafluoroethylene separation and purification. Background technique [0002] Tetrafluoroethylene is currently the largest, most important and most widely used fluorine-containing monomer. Tetrafluoroethylene is also called Freon 1114, the English name is Tetraflouoroethylene, the CSA number is 116-14-3, and the molecular formula is C 2 f 4 , chemical formula CF 2 = CF 2 , the relative molecular mass is 100.02. [0003] Tetrafluoroethylene is a colorless and odorless gas, a flammable and explosive compressible gas and liquefied gas. Melting point -142.5°C, boiling point -76.3°C, insoluble in water, heavier than air. The relative density is 1.519, the critical temperature is 33.3°C, the critical pressure is 3.92MPa, and the ignition poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C17/383C07C21/185
CPCC07C17/38C07C17/383C07C21/185
Inventor 王立超刘晶晶朱琳王士颖张亚云高扬
Owner 天津市振津石油天然气工程有限公司
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