Absorption performance and stratification mechanism of biphasic CO2 absorbent[Bmim] [BF4]/MEA aqueous mixtures

doi:10.11949/j.issn.0438-1157.20180687

Abstract

Abstract:

The absorption performance of liquid-liquid biphasic CO₂ absorbent aqueous mixture of 1-butyl-3-methylimidazoliumtetrafluoroborate ([Bmim] [BF₄]) and monoethanolamine (MEA) was measured, and the effects of[Bmim] [BF₄] on the absorption properties and stratification were investigated. The stratification mechanism and substance distribution were analyzed with quantitative¹³C nuclear magnetic resonance (NMR) method. The results showed that the liquid-liquid stratification would occur when loaded with CO₂, which was accompanied with the enrichment of the reaction products of CO₂. The cause of the liquid-liquid stratification is the increase of the concentration of carbamates. The absorption rates of absorbents increase first and then decrease with the increase of the mass fraction of[Bmim] [BF₄]. H₂O is mainly distributed in the rich phase after stratification, and[Bmim] [BF₄] is mainly distributed in the lean liquid phase. The mass fraction of H₂O directly affects the mass transfer performance of the rich liquid phase.

Key words: CO₂ capture, liquid-liquid biphasic absorbent, absorption, ionic liquid, MEA

摘要：

对液液两相CO₂吸收剂1-丁基-3-甲基咪唑四氟硼酸盐（[Bmim][BF₄]）/乙醇胺（MEA）混合水溶液吸收性能进行了实验测定，研究了离子液体[Bmim][BF₄]的引入对吸收性能和液液分相的影响，并通过定量碳谱核磁共振法对分相机理和各相中的物质分布进行分析。研究结果表明，一定配比的[Bmim][BF₄]/MEA混合水溶液吸收CO₂之后会出现互不相溶的液液两相，这种现象伴随着CO₂产物的富集；导致液液分相的原因是氨基甲酸盐浓度的增大；随着[Bmim][BF₄]质量分数的增大，溶液吸收速率呈现出先增大后减小的趋势；分层后H₂O主要分布在富液相，[Bmim][BF₄]主要分布在贫液相，H₂O的质量分数直接影响分层后富液相的传质性能。

关键词: 二氧化碳捕集, 液液两相吸收剂, 吸收, 离子液体, 乙醇胺

CLC Number:

TQ028.8

XU Lingjun, QI Yang, WANG Shujuan. Absorption performance and stratification mechanism of biphasic CO₂ absorbent[Bmim] [BF₄]/MEA aqueous mixtures[J]. CIESC Journal, 2018, 69(12): 5112-5119.

徐令君, QI Yang, 王淑娟. [Bmim][BF₄]/MEA混合水溶液吸收CO₂的吸收性能与液液分相机理[J]. 化工学报, 2018, 69(12): 5112-5119.

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Absorption performance and stratification mechanism of biphasic CO₂ absorbent[Bmim] [BF₄]/MEA aqueous mixtures

[Bmim][BF₄]/MEA混合水溶液吸收CO₂的吸收性能与液液分相机理

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