膜科学与技术

Pebax气体分离膜制备及其用于沼气提纯的研究

作者：任晓灵，任吉中，刘欣艳

单位： 1.北京市城市管理研究院生活垃圾检测分析与评价北京市重点实验室,北京市 100028; 2.中国科学院大连化学物理研究所,辽宁省大连市 116023

关键词：聚醚共聚酰胺；复合气体分离膜；沼气提纯；可行性研究

出版年,卷(期):页码： 2020,40(2):82-88

摘要：

以聚醚共聚酰胺（Pebax1657）为分离层膜材料，采用浸渍涂覆法制备复合气体分离膜，考察了Pebax复合膜对CH4、CO2和H2S等纯气以及一系列浓度CO2/CH4混合气的渗透分离性能，并采用螺旋卷式膜分离器错流模型模拟分析Pebax气体分离膜用于沼气提纯的技术可行性。实验结果表明：Pebax膜具有较高的CO2渗透通量和CO2/CH4分离系数。由于CO2的增塑作用，复合膜对CO2/CH4混合气的分离系数小于其理想分离系数；不同浓度混合气中CO2与CH4的渗透通量随原料气中CO2分压的增大而增大，而与原料气中CO2的浓度无关。Pebax单级膜分离的沼气提纯效果受切割比、压力比等操作条件以及原料气组成等因素的影响，通过设计两级Pebax膜分离工艺可将CH4富集到95%以上，同时回收90%的甲烷，改进膜工艺参数可获得更高的提纯效果，Pebax复合气体分离膜用于沼气提纯甲烷是可行的。

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.

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

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