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one for n 2 /ch 4 Gas Separation Membranes

A separation membrane, CH4 technology, applied in the separation method, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of less than 50%, stagnant utilization rate, waste of resources, etc., and achieve the effect of improving separation performance

Active Publication Date: 2020-04-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the utilization rate of coalbed methane has stagnated, with an average of less than 50%. Every year, a lot of coalbed methane is directly released into the atmosphere, resulting in a huge waste of resources, and the greenhouse effect of methane in coalbed methane is CO 2 21 times of that, causing great harm to the environment
The main reason for the poor separation effect is: the conventional polymer is separating N 2 / CH 4 When , the dissolution selectivity is often less than 1, while the diffusion selectivity is greater than 1. This contradictory situation is not conducive to the membrane method N 2 / CH 4 separation

Method used

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  • one for n <sub>2</sub> /ch <sub>4</sub> Gas Separation Membranes
  • one for n <sub>2</sub> /ch <sub>4</sub> Gas Separation Membranes
  • one for n <sub>2</sub> /ch <sub>4</sub> Gas Separation Membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a certain amount of dodecafluoroheptyl methacrylate, a certain amount of polydipentaerythritol hexaacrylate and 1000ppm initiator 1-hydroxycyclohexyl phenyl ketone and mix evenly, place it on a quartz glass plate after defoaming, and place it Exposure to UV light for a certain period of time, crosslinks to give a solid film. The performance of the separation membrane is shown in Table 1.

[0021] Table 1

[0022]

[0023]

Embodiment 2

[0025] Get a certain amount of 1H, 1H, 7H-dodecafluoroheptyl acrylate and a certain amount of crosslinking agent (the mass ratio of monomer to crosslinking agent is 95:5), and 100 ppm initiator dibenzoyl peroxide Mix evenly, place it on a polyacrylonitrile ultrafiltration membrane after defoaming, expose it to ultraviolet light for a certain period of time, and cross-link to obtain a solid film. The performance of the separation membrane is shown in Table 2.

[0026] Table 2

[0027]

[0028]

Embodiment 3

[0030] Get equivalent polydipentaerythritol pentaacrylate and polydipentaerythritol hexaacrylate, certain monomer (the mass ratio of monomer and crosslinking agent is 90: 10), 500ppm initiator azobisisobutyronitrile mixes homogeneously, After defoaming, place on a glass plate and heat at 45°C for 10 hours to cross-link to obtain a solid film. The performance of the separation membrane is shown in Table 3.

[0031] table 3

[0032] monomer N 2 Penetration rate (10 -6 cm 3 (STP) cm -2 ·s -1 ·cmHg -1 )

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Abstract

The invention relates to gas separation membrane technologies and in particular relates to a gas separation membrane for N2 / CH4 separation. The separation membrane is prepared through free radical polymerization among carbon-carbon double bonds. In addition to carbon atoms, the separation membrane contains lots of fluorine atoms. The solubility of CH4 is reduced, so that the dissolution selectivity is improved, and the N2 / CH4 separation performance of the separation membrane can be improved. The preparation method comprises the following steps: mixing a monomer with high fluorine content and a cross-linking agent, adding an initiator, and coating the mixed solution onto a support, thereby obtaining the separation membrane through the radical polymerization among carbon-carbon double bonds.

Description

technical field [0001] The present invention relates to polymer separation membrane technology, specifically prepares a kind of membrane for N 2 / CH 4 Separation of gas separation membranes. Background technique [0002] Coalbed methane is natural gas that occurs in coal seams. Compared with ordinary natural gas, it hardly contains heavy hydrocarbon components above C2. It is estimated that the reserves of coalbed methane buried underground are about 26031012 cubic meters. In recent years, the utilization rate of coalbed methane has stagnated, with an average of less than 50%. Every year, a lot of coalbed methane is directly released into the atmosphere, resulting in a huge waste of resources, and the greenhouse effect of methane in coalbed methane is CO 2 21 times of that, causing great harm to the environment. Therefore, the development of coalbed methane enrichment technology with relatively low methane concentration and flexible operation is a key problem in solving ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/40B01D53/22
CPCB01D53/228B01D71/40
Inventor 丁晓莉马春雨谭芳芳
Owner TIANJIN POLYTECHNIC UNIV