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

doi:10.16085/j.issn.1000-6613.2022-1511

Abstract

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

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

CLC Number:

TQ028.1

LYU Chao, ZHANG Xiwen, JIN Lijian, YANG Linjun. Efficient capture of CO₂ by a new biphasic solvent-ionic liquid system[J]. Chemical Industry and Engineering Progress, 2023, 42(6): 3226-3232.

吕超, 张习文, 金理健, 杨林军. 新型两相吸收剂-离子液体系统高效捕获CO₂[J]. 化工进展, 2023, 42(6): 3226-3232.

Figures/Tables 12

References 21

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吸收剂胺组成	一级胺结构	是否分相	分相情况
TMEDA+AEEA		是
TMEDA+MEA		是
TMEDA+DETA		否
TMEDA+TETA		否

吸收剂胺组成	一级胺结构	是否分相	分相情况
TMEDA+AEEA		是
TMEDA+MEA		是
TMEDA+DETA		否
TMEDA+TETA		否

项目	TMEDA+AEEA	TMEDA+MEA
分相时间/min	5.5	14.0
分相比(上相体积∶下相体积)	7∶19	7∶34
上相CO₂负荷/mol·kg^-1	0.053	0.089
下相CO₂负荷/mol·kg^-1	0.631	1.090

项目	TMEDA+AEEA	TMEDA+MEA
分相时间/min	5.5	14.0
分相比(上相体积∶下相体积)	7∶19	7∶34
上相CO₂负荷/mol·kg^-1	0.053	0.089
下相CO₂负荷/mol·kg^-1	0.631	1.090

吸收剂胺组成	上相CO₂负荷/mol·kg^-1	下相CO₂负荷/mol·kg^-1
TMEDA+AEEA	0.089	2.046
TMEDA+MEA	0.102	1.613

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

新型两相吸收剂-离子液体系统高效捕获CO₂

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Figures/Tables 12

References 21

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吸收剂	物质组成	组成物质质量比
a	TMEDA+AEEA+H₂O	10∶5∶5
b	TMEDA+AEEA+H₂O+[DBU][Im]	10∶5∶4∶1
c	TMEDA+AEEA+H₂O+[DBU][Im]	10∶4∶5∶1

项目	a	b	c
上相CO₂负荷/mol·kg^-1	0.089	0.013	0.103
下相CO₂负荷/mol·kg^-1	2.046	2.215	3.061

项目	a	b	c
分相时间/min	5.5	3	5
分相比(上相体积:下相体积)	7∶19	7∶10	7∶26
上相CO₂负荷/mol·kg^-1	0.053	0.053	0.341
下相CO₂负荷/mol·kg^-1	0.631	0.301	0.823
黏度/mPa·s	194.3	183.5	170.7

碳原子编号	化学位移	对应碳原子位置
1	61.73~61.48
2	53.41~52.28
3	52.94~52.81
4	42.61~42.48
5	163.69~163.56
6	163.26~163.15

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