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A kind of preparation method of high-efficiency gas separation membrane

A gas separation membrane, high-efficiency technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as low gas permeability coefficient, achieve high separation factor, low preparation cost, and good reproducibility

Active Publication Date: 2018-01-05
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although compared with previous studies, the separation coefficient of the gas separation membrane prepared by them is higher, but its relatively low gas permeability coefficient is far from enough to make it widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.1% polyvinyl alcohol to a mixed solution containing 1% glutaraldehyde and 0.5% 0.3nm zeolite molecular sieve, mix well, and then apply it to the reverse osmosis basement membrane. After 20 seconds, pour off the excess solution and dry it in the shade. , coating an aqueous solution containing 0.1% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 2200Lm2h / Mpa, the gas permeability of N2 is 4Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reached 550.

Embodiment 2

[0025] Add 0.2% polyvinyl alcohol to the mixed solution containing 3% glutaraldehyde and 0.8% 0.3nm zeolite molecular sieve, mix well, and apply it on the reverse osmosis basement membrane, pour off the excess solution after 20s, and dry in the shade , coating an aqueous solution containing 0.3% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 1800Lm2h / Mpa, the gas permeability of N2 is 1Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reaches 1800.

Embodiment 3

[0027] Add 0.3% polyvinyl alcohol to the mixed solution containing 3% glutaraldehyde and 0.8% 0.3nm zeolite molecular sieve, mix well, and apply it on the reverse osmosis basement membrane. After 20s, pour off the excess solution and dry it in the shade. , coating an aqueous solution containing 0.3% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 1200Lm2h / Mpa, the gas permeability of N2 is 1Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reaches 1200.

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Abstract

The invention belongs to the technical field of gas separation membranes, in particular to a preparation method of an efficient gas separation membrane based on transfer promotion and a molecular sieve selective permeability mechanism. According to the preparation method provided by the invention, through introducing a functional group and a molecular sieve onto a reverse osmosis base membrane, a certain dose of additive is introduced, and then post-treatment is performed at certain temperature. Through regulating a membrane structure from different levels, the synergistic effect of multiple choices is realized, so as to improve the performance of the separation membrane. The preparation method provided by the invention has the advantages that through the method of introducing the functional group and the molecular sieve, a reactive choice mechanism and a diffusion choice mechanism can be realized at the same time, and fine adjustment on the membrane structure can also be realized, a gas permeation passage is formed, the preparation of the efficient gas separation membrane can be realized under normal conditions without needing to change the preparation procedures of a common composite separation membrane; moreover, compared with the prior art, the gas separation membrane prepared by the preparation method has extremely high separation factors, relatively good reproducibility, and low preparation cost.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, and specifically refers to a high-efficiency gas separation membrane based on the mechanism of accelerated transfer and molecular sieve selective permeability and a preparation method thereof. technical background [0002] my country's gas membrane separation research began in the early 1980s, and its most widely used is for CO 2 separation. Such as oil field high pressure injection of CO 2 Tertiary oil recovery process, after the crude oil comes out of the wellhead, the associated gas contains 80% CO 2 , must be separated and recovered and concentrated to more than 95% and then re-injected into oil wells for recycling. Another example is flue gas CO 2 enrichment, etc., so membrane separation will become more common in the future and become an economically viable way to concentrate CO 2 Way. Moreover, the membrane separation method has the advantages of high separation effi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D67/00B01D69/02B01D53/22
CPCB01D53/228B01D67/0083B01D67/0093B01D69/02B01D71/06B01D2323/30B01D2323/36
Inventor 陈可可翟丁李洪懿潘巧明
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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