Supported ionic liquid membranes for CO<sub>2</sub>/CH<sub>4</sub> separation

WU Yanhui; ZHANG Tianhao; DUAN Yongchao; YU Shikun

doi:10.3969/j.issn.0438-1157.2013.z1.016

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Supported ionic liquid membranes for CO₂/CH₄ separation

更新时间：2025-12-10

- Supported ionic liquid membranes for CO₂/CH₄ separation
- CIESC Journal Issue S1, Pages: 111-117(2013)
- 作者机构：
  
  同济大学化学系,上海,200092
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.z1.016
  CLC： Q028.8
- Online First：30 December 2013，
  
  Published：30 December 2013
- 稿件说明：
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WU Yanhui, ZHANG Tianhao, DUAN Yongchao, et al. Supported ionic liquid membranes for CO₂/CH₄ separation[J]. CIESC Journal, 2013, (S1): 111-117. DOI: 10.3969/j.issn.0438-1157.2013.z1.016.
DOI：

WU Yanhui, ZHANG Tianhao, DUAN Yongchao, et al. Supported ionic liquid membranes for CO₂/CH₄ separation[J]. CIESC Journal, 2013, (S1): 111-117. DOI: 10.3969/j.issn.0438-1157.2013.z1.016. DOI：

摘要

由于离子液体对CO2具有较好的溶解选择性，离子液体支撑液膜分离CO2越来越受到关注。比较了含3种不同阴离子的常规离子液体([bmim][BF4]、[bmim][PF6]、[bmim][Tf2N])作为支撑液膜的液膜相分离CO2/CH4的性能，考察了咪唑环上烷基链长对离子液体支撑液膜性能的影响。考虑向离子液体中引入胺基和羧基等亲CO2基团，制备了1-丁基-3-甲基咪唑丙氨酸离子液体([bmim][β-Ala])，考察了 [bmim][β-Ala]支撑液膜分离CO2/CH4的性能，并对在CO2渗透测试前后的支撑液膜进行了FT-IR分析，发现氨基酸离子液体中的—NH2和CO2的较强作用以及该离子液体的高黏性影响了CO2的透过性，使[Bmim][β-Ala]支撑液膜的CO2透过率低。

Abstract

Ionic liquid have shown preferential solubility for CO2

more and more attentions have been paid to CO2 separation with supported ionic liquid membranes (SILMs). In this paper

three conventional imidazolium-based ionic liquids containing different anions

[bmim][BF4]

[bmim][PF6] and [bmim][Tf2N]

were used as membrane liquids for CO2/CH4 separation. The performances of these SILMs were studied and discussed. The supported liquid membrane with [bmim][Tf2N] showed the highest permeability of CO2 for this ionic liquid has the best solubility to CO2 and rather low viscosity. And the effect of the alkyl chain length of imidazole ring on the performance of SILMs was also investigated. With the increase of alkyl chain length

the CO2 permeability and ideal selectivity of CO2/CH4 decrease. A new task-specific ionic liquids (TSIL) which has two CO2-philic groups

amino and carboxyl group ([bmim][β-Ala]) was synthesized and the corresponding ionic liquid supported membrane was made. FT-IR spectra of [bmim][β-Ala]-PVDF before and after CO2 permeation test showed that the chemical reaction occurred between NH2 and CO2

generating a new carboxyl groups

which made CO2 difficult to desorb on the downstream side of SILMs. Therefore the SILMs with [bmim][β-Ala] showed very low CO2 permeability.

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Supported ionic liquid membranes for CO2/CH4 separation

DOI：10.3969/j.issn.0438-1157.2013.z1.016

摘要

Abstract

关键词

Keywords

references

Supported ionic liquid membranes for CO₂/CH₄ separation