Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recovering tail gas generated by tetrafluoroethylene

A technology of tetrafluoroethylene and recycling methods, applied in separation methods, chemical instruments and methods, organic chemistry, etc., can solve problems such as increased operating costs, poor purity of recycled products, and increased environmental pollution

Inactive Publication Date: 2008-04-30
阳光乐程(北京)网络科技有限公司 +4
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] 2. The purity of recovered products is poor, and the recovery rate of TFE in most solvent methods is lower than 85%
[0021] 3. The solvent is lost during the operation, one increases the operating cost; the other increases the environmental pollution
[0022] 4. Both the solvent absorption process and the solvent analysis process need to use frozen brine and steam, which consumes a lot of energy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering tail gas generated by tetrafluoroethylene
  • Method for recovering tail gas generated by tetrafluoroethylene
  • Method for recovering tail gas generated by tetrafluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: See Figure 1

[0050] Primary separation: TFE tail gas 1 temperature is -10°C, pressure is 1.1MPa(a), the molar weight composition of 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 0.8MPa, and the gas residence time is 1.5 s, separated into permeate gas 5 with high CO content (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%, CO 11%, O 2 10ppm). The retentate gas 4 is decompressed and returned to the TFE compression recovery system.

[0051] Secondary separation: add CO in...

Embodiment 2

[0052] Example 2: See Figure 2

[0053] 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 a high content of CO (the molar composition of the substance is 36.5% of CO, CO 2 2%, TFE 61.5%, O 2 110ppm), introduced into the mixing tank 7 with CO 2 Mixing; Another stream is retentate gas 4 with low content of CO (the molar weight composition of the substance is TFE 88%, CO 12%,...

Embodiment 3

[0055] Embodiment 3: See Figure 3

[0056] Primary separation: TFE tail gas 1 temperature is -10°C, pressure is 1.1MPa(a), the molar weight composition of 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 high CO content (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%, CO 11%, O 2 10ppm). The retentate gas 4 is decompressed and returned to the TFE compression recovery system.

[0057] Secondary separation: add CO in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for recycling exhaust gas produced by perfluoroethylene. The invention employs the separating process of two-stage films or multi-stage films. Admixture of gas with TFE passes through a first-stage gas separation film component in gaseous state, the infiltration gas further recycles TFE, and the infiltration gas enters a second-stage film separation component after the concentration of the infiltration gas is adjusted by materials which are easy to be separated, such as carbon dioxide and the like and after being deoxidized. The infiltration gas of the second-stage film separation component further recycles TFE or enables the infiltration to be directly return a first-stage film separator of which the existing circulating recycles TFC and separates CO. The infiltration gas of the second film is discharged in upper air or is further treated. Or the first-stage infiltration gas directly enters the second film separating component, and the infiltration gas of the second-stage film separating component further recycles TFC, and then the second film infiltration gas is discharged in upper air. Compared with the existing technology, the method of the invention has the advantages of simple procedure, high recycle rate of TFC, no utilization of fusing agent, low cost and the like.

Description

technical field [0001] The present invention relates to a kind of tetrafluoroethylene (TFE, molecular formula C 2 f 4 ) recovery method for production tail gas, that is, a method for recovering TFE from production tail gas containing components such as TFE and carbon monoxide. 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 hydrogen atom's van der Waals radius of 0.12nm. Most of the hydrogen atoms in organic compounds can be replaced by fluorine atoms with similar volumes to form a large number of organic fluorine compounds. Due to the large electronegativity, small atomic radius, low polarizability of fluorine-carbon bonds and weak intermolecular force of fluorine, the introduction of fluorine into organic compounds is often accompanied by significant changes in physical and chemical properties, and has ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22C07C17/38C07C21/185
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com