膜科学与技术

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ClassificationCode：TQ028.8；S216.4

year,volume(issue):pagination： 2020,40(2):82-88

Abstract：

Poly (amide-6-b-ethylene oxide) (Pebax1657) copolymer is used to prepare composite membranes by dip-coating method for biogas purification. The permeation performance of pure gases and CO2/CH4 mixture gases in Pebax1657 composite membranes is investigated. A cross flow mathematical model of spiral-wound membrane module is used for the feasibility analysis of membrane separation technology for biogas purification. Pebax1657 composite membrane has high CO2 permeation flux and CO2/CH4 selectivity. Due to the CO2 induced plasticization effect, the real CO2/CH4 selectivity is lower than the ideal selectivity. The gas permeation fluxes of both CO2 and CH4 increase with the increase of CO2 partial pressure, while irrelevant to the CO2 concentration. The biogas purification effects of single stage Pebax composite membrane are greatly influenced by stage cut, pressure ratio, and feed CH4 concentration. By a two-stage membrane separation process, the CH4 concentration can be enriched to 95% with a recovery of 90%. A higher purification effect can be achieved by improving the membrane technology parameters. Pebax composite membrane is feasible for biogas purification.

Funds：

国家自然科学基金“锂离子电池用ETFE/PE共混微孔隔膜的可控制备研究”（NF21406428）

AuthorIntro：

一作者简介：任晓灵（1984-），女，石家庄，工程师，博士，从事环境保护和新能源开发领域的研究工作，E-mail：renxiaoling203@163.com

Reference：

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