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Tail gas recovery method of tetrafluoroethylene production and its membrane module

A technology for recovery of tetrafluoroethylene and tail gas, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of lower membrane module efficiency, low recovery rate, low pressure, etc.

Inactive Publication Date: 2011-12-21
阳光乐程(北京)网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery of TFE in the solvent absorption process has the following disadvantages: the commonly used absorbent is a substance that is phased out or banned; the purity of the recovered product is poor, and the recovery rate is lower than 85%; the solvent is lost during operation, which increases costs and environmental pollution; the solvent absorption process Both the process of desorption and solvent analysis need to use refrigerated brine and steam, and the energy consumption is high
[0005] 1. Due to the low pressure of the primary membrane module, the permeate gas cannot enter the secondary membrane module for separation, so that part of the TFE in the permeate gas cannot be recovered, which reduces the efficiency of the membrane module;
[0006] 2. The structure of the original membrane module is unreasonable, easy to leak, and the loss of material gas is high

Method used

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  • Tail gas recovery method of tetrafluoroethylene production and its membrane module
  • Tail gas recovery method of tetrafluoroethylene production and its membrane module
  • Tail gas recovery method of tetrafluoroethylene production and its membrane module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: see figure 1

[0032] Primary separation: TFE tail gas 1 temperature is -10 ℃, pressure is 1.1MPa (absolute pressure), TFE tail gas 1 (the molar weight composition of substance is TFE 83%, CO 17%, O 2 40ppm) enters the buffer tank 2 of the primary membrane inlet adsorber in a gaseous state through the pipeline, and the retentate gas 13 of the secondary membrane separator 12 also enters the buffer tank 2 of the primary membrane inlet adsorber, and passes through the primary membrane separator 3 after the pressure is stabilized , the pressure difference on both sides of the membrane module is 0.9MPa, the gas residence time is 1.5s, and it is separated into permeate gas 5 with high CO content (the molar composition of the substance is CO36.5%, CO 2 2%, TFE 61.5%, O 2 110ppm), introduced into the mixing tank 7 with CO 2 Mixing; Another stream is the retentate gas 4 of CO low content (the molar weight composition of substance is TFE88%, CO12%, O 2 10ppm). ...

Embodiment 2

[0034] Example 2: see figure 2

[0035] Primary separation: TFE tail gas 1 temperature is 15 ℃, pressure is 1.1MPa (absolute pressure), TFE tail gas 1 (the molar weight composition of substance is TFE 83%, CO 17%, O 2 40ppm) enters the buffer tank 2 of the primary membrane inlet adsorber in a gaseous state through the pipeline, and the retentate gas 13 of the secondary membrane separator 12 also enters the buffer tank 2 of the primary membrane inlet adsorber, and passes through the primary membrane separator 3 after the pressure is stabilized , the pressure difference on both sides of the membrane module is 0.9MPa, the gas residence time is 1.5s, and it is separated into permeate gas 5 with high CO content (the molar composition of the substance is CO36.5%, CO 2 2%, TFE 61.5%, O 2 110ppm), introduced into the mixing tank 7 with CO 2 Mixing; Another stream is the retentate gas 4 of CO low content (the molar weight composition of substance is TFE88%, CO12%, O 2 10ppm). The...

Embodiment 3

[0038] Embodiment 3: see image 3

[0039]Primary separation: TFE tail gas 1 has a temperature of 30°C and a pressure of 1.1MPa(a), and the molar composition of the tail gas is TFE 83%, CO 17%, O 2 40ppm, enter the buffer tank 2 of the first-stage membrane inlet adsorber in gaseous state through the pipeline, and pass through the first-stage membrane separator 3 after the temperature is stabilized (about 2°C), the pressure difference between the two sides of the membrane module is 0.9MPa, and the gas residence time is 1.5 s, separated into permeate gas 5 with a high content of CO (the molar composition of the substance is CO 34%, TFE 66%, O 2 120ppm), introduced into the mixing tank 7 and CO through the pipeline 2 Gas 6 is mixed; Another stream is the retentate gas 4 of CO low content (the molar weight composition of material is TFE 89%, CO11%, O 2 10ppm). The retentate gas 4 is decompressed and returned to the TFE compression recovery system.

[0040] Secondary separati...

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Abstract

The present invention provides a membrane module for recovery of tail gas from tetrafluoroethylene production, which includes a filter, a plurality of parallel and / or serial membranes, wherein the membrane is a polyolefin non-porous hollow fiber membrane; the present invention also provides a Tail gas recovery method for tetrafluoroethylene production, which uses the aforementioned membrane module; using the membrane module based on the present invention and the corresponding tetrafluoroethylene tail gas recovery method, under the same working conditions and operations, the total recovery rate of tetrafluoroethylene is increased by 10% at most around, and significantly reduce membrane consumption.

Description

technical field [0001] The invention relates to the recovery of industrial production tail gas, in particular to a method for recovering tetrafluoroethylene (TFE) from the tail gas of tetrafluoroethylene (TFE) production and a corresponding membrane module. Background technique [0002] Tetrafluoroethylene is currently the largest and most important fluorine-containing monomer. 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] In the production of TFE, the material gas entering the light removal tower or crude fractionation tower of the rectification system contains a part of CO, O 2 Non-condensable gases such as the enrichment at the top of the tower, so in the current tetrafluoroethylene production process, CO, O 2 And a small am...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D63/02C07C17/38C07C21/185
Inventor 单杰王新平谢建平胡经宇
Owner 阳光乐程(北京)网络科技有限公司
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