One-step fabrication of asymmetric membranes containing amino compound for CO2 separation

doi:10.11949/j.issn.0438-1157.20180588

CIESC Journal ›› 2018, Vol. 69 ›› Issue (11): 4778-4787.DOI: 10.11949/j.issn.0438-1157.20180588

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One-step fabrication of asymmetric membranes containing amino compound for CO₂ separation

CAO Xiaochang¹, WANG Zhi¹, QIAO Zhihua¹, WANG Jixiao¹, XU Zhenliang²

1. State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R & D Lab oratory, Chemical Engineering Research Center, East China University of Science and Technology, Shanghai 200237, China

Received:2018-05-31 Revised:2018-09-05 Online:2018-11-05 Published:2018-11-05
Supported by:
supported by the National Key R&D Program of China (2017YFB0603400) and the National Natural Science Foundation of China (21436009).

一步法制备含氨基化合物的非对称CO₂分离膜

曹晓畅¹, 王志¹, 乔志华¹, 王纪孝¹, 许振良²

1. 化学工程联合国家重点实验室, 天津大学化工学院化学工程研究所, 天津化学化工协同创新中心, 天津市膜科学与海水淡化技术重点实验室, 天津 300072;
2. 化学工程联合国家重点实验室, 华东理工大学化学工程研究所膜科学与工程研发中心, 上海 200237

通讯作者: 王志
基金资助:
国家科技支撑计划项目（2017YFB0603400）；国家自然科学基金项目（21436009）。

Abstract

Abstract:

A one-step phase separation method was used to prepare a membrane base on polyethersulfone (PES) and diethanolamine (DEA) as an additive and an amino carrier for CO₂ separation. CO₂ separation membranes show promising applications in energy gas purification and flue gas CO₂ capture. However, the separation performance of commercial membranes can hardly meet the practical requirement. To easily fabricate membrane with enhanced CO₂ separation performance, diethanol amine (DEA) was filled into polyether sulfone (PES) to fabricate asymmetric membranes in one-step by non-solvent induce phase separation (NIPs). The effects of the PES content, DEA content, coating thickness and the heat treatment on the separation performance of DEA/PES membrane were investigated by using CO₂/N₂ mixed gas (15/85 by volume). When the PES content was 26% and the DEA content was 12% in the coating solution and the feed gas pressure was 0.11 MPa, the DEA/PES membrane exhibited a CO₂permeance of 274 GPU and a CO₂/N₂selectivity of 50. The stability results indicate that the CO₂/N₂ separation performance of DEA/PES membrane remained stable at 40℃. Moreover, the CO₂/N₂ best-performing DEA/PES membrane was used to separate CO₂/CH₄ mixed gas (10/90 by volume). The CO₂/CH₄ separation performance at 1.0 MPa was better than commercial membranes. These results shows promising applications of DEA/PES membranes in CO₂ separation.

Key words: CO₂ capture, one-step fabrication, phase separation, asymmetric membrane, scale up, polyether sulfone

摘要：

采用一步相分离法，制备以聚醚砜（PES）为主体材料，二乙醇胺（DEA）为添加剂和氨基载体的膜，用于CO₂分离。考察了PES浓度、DEA浓度、膜厚度对CO₂/N₂分离性能的影响，同时考察了膜性能的长时间稳定性。当涂膜液中DEA/PES的质量比为12/26、刮刀与无纺布的距离为300 μm、进料气压力为0.11 MPa（表压）时，膜的CO₂渗透速率可达274 GPU，CO₂/N₂分离因子可达50。测试温度低于40℃时，DEA/PES膜的CO₂渗透速率和CO₂/N₂分离因子保持稳定。另外，对CO₂/N₂分离性能较好的DEA/PES膜（质量比为12/27）进行CO₂/CH₄分离性能测试，在1 MPa（表压）下性能优于商品膜。上述结果表明，本文研制的DEA/PES膜制备步骤简单，易于规模化制备，性能较优，在CO₂分离领域具有良好的应用前景。

关键词: CO₂分离, 一步法, 相分离, 非对称膜, 规模化, 聚醚砜

CLC Number:

TQ028.8

CAO Xiaochang, WANG Zhi, QIAO Zhihua, WANG Jixiao, XU Zhenliang. One-step fabrication of asymmetric membranes containing amino compound for CO₂ separation[J]. CIESC Journal, 2018, 69(11): 4778-4787.

曹晓畅, 王志, 乔志华, 王纪孝, 许振良. 一步法制备含氨基化合物的非对称CO₂分离膜[J]. 化工学报, 2018, 69(11): 4778-4787.

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One-step fabrication of asymmetric membranes containing amino compound for CO₂ separation

一步法制备含氨基化合物的非对称CO₂分离膜

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