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过程工程学报 ›› 2023, Vol. 23 ›› Issue (5): 781-789.DOI: 10.12034/j.issn.1009-606X.222175

• 研究论文 • 上一篇    下一篇

超强碱离子液体-有机胺-水复配溶剂高效CO2捕集

王凯旋1， 李涛1*， 李玉1， 白银鸽2,3,4*， 曾少娟2,3,4， 任保增1， 张香平1,2,3,4， 董海峰2,3,4
  

  1. 1. 郑州大学化工学院，河南 郑州 450001 2. 中国科学院过程工程研究所，离子液体清洁过程北京市重点实验室, 北京 100190 3. 中国科学院过程工程研究所，北京 100190 4. 惠州市绿色能源与新材料研究院，广东 惠州 516081
  • 收稿日期:2022-05-17 修回日期:2022-06-08 出版日期:2023-05-28 发布日期:2023-06-01
  • 通讯作者: 白银鸽 ygbai@ipe.ac.cn
  • 基金资助:
    国家自然科学基金项目;山西省科技重大专项项目

Efficiently CO2 capture by superbase ionic liquid-amine-water blending solvents

Kaixuan WANG1,  Tao LI1*,  Yu LI1,  Yinge BAI2,3,4*,  Shaojuan ZENG2,3,4,  Baozeng REN1,  #br# Xiangping ZHANG1,2,3,4,  Haifeng DONG2,3,4   

  1. 1. School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China 2. Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 4. Huizhou Institute of Green Energy and Advanced Materials, Huizhou, Guangdong 516081, China
  • Received:2022-05-17 Revised:2022-06-08 Online:2023-05-28 Published:2023-06-01

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摘要： CO2捕集是实现碳减排的重要技术之一。其中，化学吸收法是一种有效的、适用于低CO2分压的CO2捕集技术。开发出一种高效、低能耗、环保的吸收剂是该领域的研究难点和热点。离子液体(ILs)作为一类绿色溶剂，在CO2捕集中具有结构可调节、反应速率快、吸收量高等优势，但存在黏度大、价格昂贵等问题，本工作提出将超强碱离子液体1,8-二氮杂二环[5,4,0]十一碳-7-烯咪唑([HDBU][Im])与单乙醇胺(MEA)复配得到离子液体复配溶剂，来提高吸收剂的CO2吸收量并降低吸收CO2后溶剂的黏度。研究了离子液体浓度、吸收温度、CO2分压等对离子液体复配溶剂捕集CO2性能的影响，测定了离子液体复配溶剂在不同CO2负荷下的密度和黏度等物性。结果表明，30wt% MEA+10wt% [HDBU][Im]具有较好的吸收能力，在40℃下，CO2吸收量达到0.1453 g CO2/g溶剂，且吸收CO2前后溶剂的黏度分别为2.312和4.303 mPa?s，显著低于离子液体吸收剂，是一种具有潜力的CO2捕集溶剂。

关键词: CO2捕集, 超强碱离子液体, 乙醇胺, 离子液体复配溶剂, 吸收量

Abstract: The increasing carbon dioxide (CO2) emissions have a serious impact on climate change. As one of the most important technologies for achieving carbon emission reduction, CO2 capture has attracted widespread attention from academia and industry. Chemical absorption is an effective and suitable CO2 capture technology for low CO2 partial pressure areas, such as flue gas. The commonly used flue gas CO2 capture method in industry is the monoethanolamine (MEA) absorption method, which has the advantages of mature technology, simple operation, and high absorption rate, but the disadvantages are high energy consumption for regeneration and easy degradation of absorbent. The development of an efficient, low-energy, and environmentally-friendly absorbent has been a difficult and hot research topic in this field. As a class of green solvents, ionic liquids (ILs) provide a new opportunity for CO2 capture due to their tunable structure, fast reaction rate, and high absorption capacity, and have become a promising solvent for CO2 capture. However, the low CO2 absorption capacity of conventional ILs and the high cost and viscosity of functionalized ILs have limited the industrial application of ILs in CO2 capture. ILs mixed with organic amine are a potential CO2 capture solvent, which can not only maintain high absorption capacity but also avoid the problem of viscosity and high cost. In this work, a superbase IL (1,8-diazabicyclo[5,4,0]undec-7-ene imidazole, [HDBU][Im]) was mixed with MEA to obtain IL blending solvents to improve the CO2 absorption capacity of the absorbent and reduce the viscosity of the solvent after absorption. The effects of IL concentration, absorption temperature, and CO2 partial pressure on the CO2 capture performance of the IL blending solvents were investigated, and the physical properties, such as density and viscosity of the IL blending solvents under different CO2 absorption capacities were analyzed. The results showed that 30wt% MEA+10wt% [HDBU][Im] had a better absorption capacity, and at the temperature of 40℃, the CO2 absorption capacity was 0.1453 g CO2/g solvent, and the viscosities before and after CO2 absorption were 2.312 and 4.303 mPa?s, respectively, which were significantly lower than those of IL absorbents. Therefore, it is a promising absorbent for CO2 capture.

Key words: CO2 capture, superbase ionic liquid, monoethanolamine, ionic liquid blending solvents, absorption capacity