Absorption performance and stratification mechanism of biphasic CO<sub>2</sub> absorbent[Bmim] [BF<sub>4</sub>]/MEA aqueous mixtures

XU Lingjun; QI Yang; WANG Shujuan

doi:10.11949/j.issn.0438-1157.20180687

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

更新时间：2025-12-10

- Absorption performance and stratification mechanism of biphasic CO₂ absorbent[Bmim] [BF₄]/MEA aqueous mixtures
- CIESC Journal Issue 12, Pages: 5112-5119(2018)
- 作者机构：
  
  1. 热科学与动力工程教育部重点实验室, 北京市盐碱及荒漠化地区生态修复与固碳工程技术研究中心, 清华大学能源与动力工程系,北京,100084
  2. CSIRO Manufacturing, Clayton,Victoria,Australia,3168
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180687
  CLC： Q028.8
- Online First：05 December 2018，
  
  Published：05 December 2018
- 稿件说明：
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XU Lingjun, QI Yang, WANG Shujuan. Absorption performance and stratification mechanism of biphasic CO₂ absorbent[Bmim] [BF₄]/MEA aqueous mixtures[J]. CIESC Journal, 2018, (12): 5112-5119. DOI: 10.11949/j.issn.0438-1157.20180687.
DOI：

XU Lingjun, QI Yang, WANG Shujuan. Absorption performance and stratification mechanism of biphasic CO₂ absorbent[Bmim] [BF₄]/MEA aqueous mixtures[J]. CIESC Journal, 2018, (12): 5112-5119. DOI: 10.11949/j.issn.0438-1157.20180687. DOI：

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。

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.

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

DOI：10.11949/j.issn.0438-1157.20180687

摘要

Abstract

关键词

Keywords

references

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