相变离子液体体系吸收分离CO2的研究现状及展望

doi:10.11949/0438-1157.20221553

化工学报 ›› 2023, Vol. 74 ›› Issue (4): 1419-1432.DOI: 10.11949/0438-1157.20221553

相变离子液体体系吸收分离CO₂的研究现状及展望

杨灿¹^,²^,³(), 孙雪琦², 尚明华⁴, 张建⁴, 张香平²^,³, 曾少娟²^,³()

^1.郑州大学河南先进技术研究院，河南郑州 450003
^2.中国科学院过程工程研究所，多相复杂系统国家重点实验室，离子液体清洁过程北京市重点实验室，北京 100190
^3.中国科学院绿色过程制造创新研究院，北京 100190
^4.中石化石油工程设计有限公司，中国石化碳捕集、利用与封存（CCUS）重点实验室，山东东营 257000

收稿日期:2022-11-30 修回日期:2023-03-08 出版日期:2023-04-05 发布日期:2023-06-02
通讯作者: 曾少娟
作者简介:杨灿（1998—），女，硕士研究生，yangcan2021@ipe.ac.cn
基金资助:
国家重点研发计划项目(2022YFB4101701);国家自然科学基金项目(22122814);中国科学院绿色过程制造创新研究院自主部署项目(IAGM2020C14);多相复杂系统国家重点实验室自主研究课题项目(MPCS-2022-A-03)

Research status and prospect of CO₂ absorption and separation by phase-change ionic liquid systems

Can YANG¹^,²^,³(), Xueqi SUN², Minghua SHANG⁴, Jian ZHANG⁴, Xiangping ZHANG²^,³, Shaojuan ZENG²^,³()

^1.Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, Henan, China
^2.Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
^3.Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing 100190, China
^4.Sinopec Petroleum Engineering Corporation, Sinopec Key Laboratory of Carbon Capture, Utilization and Storage (CCUS), Dongying 257000, Shandong, China

Received:2022-11-30 Revised:2023-03-08 Online:2023-04-05 Published:2023-06-02
Contact: Shaojuan ZENG

摘要/Abstract

摘要：

全球工业化的迅速发展及人口增长使得化石燃料消耗不断增加，导致二氧化碳(CO₂)排放量逐年递增，引发全球化气候问题。醇胺吸收法目前在工业CO₂捕集应用最广泛，主要以单乙醇胺、甲基二乙醇胺等水溶液为吸收剂，存在溶剂损耗大、再生能耗高等问题，开发高效低能耗的新型吸收剂是实现CO₂大规模捕集的关键。离子液体具有气体亲和性好、蒸气压低、结构性质可调等特点，其中相变离子液体体系因节能潜力大被认为是新一代CO₂吸收剂，其吸收CO₂后由均相变为互不相溶的液-液或液-固两相，再生时仅需对CO₂富相加热处理，可有效减少吸收剂再生体积，降低再生能耗。重点总结近五年相变离子液体体系在CO₂分离的研究现状和进展，对不同相变行为的液-液和液-固相变离子液体体系分类阐述和讨论，并对其发展趋势进行展望。

关键词: 离子液体, 相变, CO₂吸收, 低能耗, 分离

Abstract:

The rapid development of global industrialization and population growth have led to increasing consumption of fossil fuels, resulting in increasing carbon dioxide (CO₂) emissions year by year, triggering global climate issues. Presently, the alkanolamine absorption method is the most widely used for CO₂ capture in industries, mainly using aqueous solutions as monoethanolamine and methyl diethanolamine as absorbent, which results in large solvent loss and high energy consumption for regeneration. The development of new absorbent with high efficiency and low energy consumption is the key to achieve large-scale CO₂ capture. Ionic liquids have the characteristics of great gas affinity, low vapor pressures and tunable structures properties. Phase-change ionic liquid systems are considered as the new generation solvents for CO₂ capture with low energy consumption. During CO₂ absorption, homogeneous ionic liquid-based solvents can undergo phase transition into liquid-liquid or liquid-solid immiscible systems. For regeneration, only the CO₂-riched phase needs to be heated, which reduces the regeneration volume of absorbent and energy consumption. This review summarized the progresses of the phase-change ionic liquid systems for CO₂ capture in recent five years, different liquid-liquid and liquid-solid phase-change behaviors of phase-change ionic liquid systems were discussed. The development trends of CO₂ capture in phase-change ionic liquid systems were also prospected.

Key words: ionic liquid, phase-change, CO₂ absorption, low energy consumption, separation

中图分类号:

TQ 534.9

杨灿, 孙雪琦, 尚明华, 张建, 张香平, 曾少娟. 相变离子液体体系吸收分离CO₂的研究现状及展望[J]. 化工学报, 2023, 74(4): 1419-1432.

Can YANG, Xueqi SUN, Minghua SHANG, Jian ZHANG, Xiangping ZHANG, Shaojuan ZENG. Research status and prospect of CO₂ absorption and separation by phase-change ionic liquid systems[J]. CIESC Journal, 2023, 74(4): 1419-1432.

图/表 10

表1 用于CO2捕集的代表性液-液相变离子液体体系

Table 1 Representative liquid-liquid phase-change ionic liquid systems for CO2 capture

液-液相变离子液体体系	主吸收剂	相分离促进剂	CO₂吸收量	文献
[BMIM][NTf₂]-MEA-环丁砜	MEA	[BMIM][NTf₂]-环丁砜	2.86 mol/kg absorbent	[43]
[BMIM][BF₄]-MEA-H₂O	MEA	[BMIM][BF₄]	0.53 mol/mol MEA	[44]
[TETAH][Lys]-乙醇-H₂O	[TETAH][Lys]	乙醇	2.35 mol/mol IL	[45]
[DETAH][Triz]-1-丙醇-H₂O	[DETAH][Triz]	1-丙醇	1.71 mol/mol IL	[46]
[TETA][Br]-DEEA-H₂O	[TETA][Br]	DEEA	—	[47]
[TETA][Br]-PMDETA-H₂O	[TETA][Br]	PMDETA	2.19 mol/mol IL	[47]
[TETA][BF₄]-PMDETA-H₂O	[TETA][BF₄]	PMDETA	—	[47]

图1 [BMIM][NTf2]-MEA-环丁砜体系相变行为及机理[43]

Fig.1 Phase-change behaviors and mechanisms of [BMIM][NTf2]-MEA-sulfolane systems[43]

表2 用于CO2捕集的代表性液-固相变离子液体体系

Table 2 Representative liquid-solid phase-change ionic liquid systems for CO2 capture

液-固相变离子液体体系	主吸收剂	相分离促进剂	CO₂吸收量	文献
[HMIM][NTf₂]-MEA	MEA	[HMIM][NTf₂]	0.5 mol/mol MEA	[38]
[EOHMIM][NTf₂]-MEA	MEA	[EOHMIM][NTf₂]	0.5 mol/mol MEA	[38]
[C _n MIM][NTf₂]-DEA	DEA	[C _n MIM][NTf₂]	0.5 mol/mol DEA	[63]
[HMIM][NTf₂]-AMP	AMP	[HMIM][NTf₂]	—	[64]
[EMIM][TfO]-MEA	MEA	[EMIM][TfO]	—	[65]
[EMIM][BF₄]-MEA	MEA	[EMIM][BF₄]	0.51 mol/mol MEA	[66]
[BMIM][BF₄]-MEA	MEA	[BMIM][BF₄]	0.52 mol/mol MEA	[66]
[TETA][BF₄]-乙醇	[TETA][BF₄]	乙醇	—	[47]
[N₁₁₁₁][Gly]-乙醇	[N₁₁₁₁][Gly]	乙醇	0.85 mol/mol IL	[67]
[N₁₁₁₁][Gly]-1-丙醇	[N₁₁₁₁][Gly]	1-丙醇	0.90 mol/mol IL	[67]
[N₁₁₁₁][Gly]-DMEE	[N₁₁₁₁][Gly]	DMEE	1.2 mol/mol IL	[68]
[DETAH][Br]-PEG200	[DETAH][Br]	PEG200	1.18 mol/mol IL	[69]
[TETA][Br]-PEG200	[TETA][Br]	PEG200	—	[47]

图2 工作电极表面的SEM照片[63]

Fig.2 SEM images of working electrode specimen[63]

图3 醇胺-离子液体二元液-固相变离子液体体系吸收CO2[64]

Fig.3 Amine-IL binary liquid-solid phase-change ionic liquid systems for CO2 absorption[64]

图4 [N1111][Gly]-乙醇（质量比1∶4）吸收CO2过程中的相变现象[67]

Fig.4 Phase-change phenomenon in the process of CO2 absorption into [N1111][Gly]-ethanol (mass ratio 1∶4)[67]

图5 离子液体和DMEE组成的吸收剂的吸收过程[68]

Fig.5 Absorption process of the absorbent consisting of IL and DMEE[68]

图6 (a) [DETAH][Br]-PEG200体系吸收CO2实时变化；(b) 反应后饱和吸收剂的两相分离[69]

Fig.6 (a) Real-time change of CO2 absorption in the [DETAH][Br]-PEG200 systems; (b) Biphasic separation of the saturated absorbent after reaction[69]

图7 沉淀和相变行为的可能形成机理[69]

Fig.7 Proposed mechanisms of precipitate and biphasic change formation[69]

图8 (a) [P2222][BnIm]吸收过程中的相变；(b) [P2222][BnIm]-CO2等摩尔反应示意图[84]

Fig.8 (a) Phase-change of [P2222][BnIm] during absorption; (b) Schematic of equimolar [P2222][BnIm]-CO2 reaction[84]

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相变离子液体体系吸收分离CO₂的研究现状及展望

Research status and prospect of CO₂ absorption and separation by phase-change ionic liquid systems

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