化工进展 ›› 2023, Vol. 42 ›› Issue (6): 3226-3232.DOI: 10.16085/j.issn.1000-6613.2022-1511

• 资源与环境化工 • 上一篇    下一篇

新型两相吸收剂-离子液体系统高效捕获CO2

吕超(), 张习文, 金理健, 杨林军()   

  1. 东南大学能源热转换及其过程测控教育部重点实验室,江苏 南京 210096
  • 收稿日期:2022-08-15 修回日期:2022-11-16 出版日期:2023-06-25 发布日期:2023-06-29
  • 通讯作者: 杨林军
  • 作者简介:吕超(1999—),女,硕士研究生,研究方向为二氧化碳捕集。E-mail:1262120294@qq.com
  • 基金资助:
    内蒙古自治区科技重大专项(2021ZD0022)

Efficient capture of CO2 by a new biphasic solvent-ionic liquid system

LYU Chao(), ZHANG Xiwen, JIN Lijian, YANG Linjun()   

  1. Key Laboratory of Energy Heat Conversion and Process Measurement and Control of the Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2022-08-15 Revised:2022-11-16 Online:2023-06-25 Published:2023-06-29
  • Contact: YANG Linjun

摘要:

以四甲基乙二胺(TMEDA)为分相剂,选用了乙醇胺(MEA)、羟乙基乙二胺(AEEA)、三乙烯四胺(TETA)和二乙烯三胺(DETA)四种常用于捕获CO2的一级胺与TMEDA以1∶2的质量比复配,其中TMEDA与AEEA组成的吸收剂吸收一定量的CO2后可以形成液液分相,且吸收CO2效果最佳,饱和吸收负荷可达1.620molCO2/kg。采用1,8-二氮杂双环[5.4.0]十一碳-7-烯-咪唑([DBU][Im])离子液体与TMEDA-AEEA液液两相吸收剂混合,研究[DBU][Im]离子液体对两相吸收剂吸收性能和液液分相的影响,通过碳谱核磁共振法对有机胺及CO2产物的物质分布进行分析。结果表明,向TMEDA-AEEA两相吸收剂中引入[DBU][Im]离子液体有助于提高CO2吸收负荷,[DBU][Im]离子液体、水和CO2反应产物主要分布于下液相,上液相存在TMEDA和少量[DBU][Im]离子液体。当TMEDA、AEEA、水、[DBU][Im]离子液体的质量比为10∶4∶5∶1时,该吸收剂富液相吸收负荷相比TMEDA-AEEA两相吸收剂提高了49.6%。

关键词: 二氧化碳, 两相吸收剂, [DBU][Im]离子液体

Abstract:

In this study, tetramethylethylenediamine (TMEDA) was used as phase separating agent, four kinds of amines (ethanolamine, aminoethylethanolamine, triethylenetetramine and diethylenetriamine) that commonly used to capture CO2 were mixed with TMEDA in a mass ratio of 1∶2. The solvent composed of TMEDA and AEEA could form a liquid-liquid phase separation after absorbing CO2, and had the best CO2 absorption characteristics, with absorption loading capacity of 1.620molCO2/kg. The mixture of 1,8-diazabicyclo [5.4.0] undecano-7-en-imidazole ([DBU][Im]) ionic liquid and TMEDA-AEEA biphasic solvent was used to study the influence of [DBU][Im] on the absorption and phase separation characteristics. The material distribution of organic amine and CO2 products in two phases were analyzed by 13C NMR spectrum. It was indicated the introduction of [DBU][Im] ionic liquids into TMEDA-AEEA biphasic solvent was helpful to increase the CO2 absorption loading capacity. The [DBU][Im] ionic liquids, water and CO2 reaction products were mainly distributed in the lower liquid phase, while TMEDA and a small amount of [DBU][Im] ionic liquids existed in the upper liquid phase. When the mass ratio of TMEDA, AEEA, water and [DBU][Im] ionic liquid was 10∶4∶5∶1, the absorption loading of the rich liquid phase of the absorbent was 49.6% higher than that of TMEDA-AEEA biphasic solvent.

Key words: carbon dioxide, biphasic solvent, [DBU][IM] ionic liquid

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