摘要
CO_(2)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CO_(2)分压的CO_(2)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CO_(2)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CO_(2)吸收量并降低吸收CO_(2)后溶剂的黏度。研究了离子液体浓度、吸收温度、CO_(2)分压等对离子液体复配溶剂捕集CO_(2)性能的影响,测定了离子液体复配溶剂在不同CO_(2)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,CO_(2)吸收量达到0.1453 g CO_(2)/g溶剂,且吸收CO_(2)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CO_(2)捕集溶剂。
The increasing carbon dioxide(CO_(2))emissions have a serious impact on climate change.As one of the most important technologies for achieving carbon emission reduction,CO_(2) capture has attracted widespread attention from academia and industry.Chemical absorption is an effective and suitable CO_(2) capture technology for low CO_(2) partial pressure areas,such as flue gas.The commonly used flue gas CO_(2) 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 CO_(2) capture due to their tunable structure,fast reaction rate,and high absorption capacity,and have become a promising solvent for CO_(2) capture.However,the low CO_(2) absorption capacity of conventional ILs and the high cost and viscosity of functionalized ILs have limited the industrial application of ILs in CO_(2) capture.ILs mixed with organic amine are a potential CO_(2) 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 CO_(2) absorption capacity of the absorbent and reduce the viscosity of the solvent after absorption.The effects of IL concentration,absorption temperature,and CO_(2) partial pressure on the CO_(2) 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 CO_(2) absorption capacities were analyzed.The results showed that 30wt%MEA+10wt%[HDBU][Im]had a better absorption capacity,and at the tem
作者
王凯旋
李涛
李玉
白银鸽
曾少娟
任保增
张香平
董海峰
Kaixuan WANG;Tao LI;Yu LI;Yinge BAI;Shaojuan ZENG;Baozeng REN;Xiangping ZHANG;Haifeng DONG(School of Chemical Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China;Beijing Key Laboratory of Ionic Liquids Clean Process,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Huizhou Institute of Green Energy and Advanced Materials,Huizhou,Guangdong 516081,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2023年第5期781-789,共9页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:22122814)
山西省科技重大专项项目(编号:20201102005)。
