离子液体[TETAH]+[BF4]--乙二醇混合体系吸收CO2的实验研究  

Experimental study on CO2 absorption by ionic liquid [TETAH]+[BF4]--ethylene glycol mixed solvent

作　　者：郭雨桐 包海艺 袁佳敏 汤明亮 杨雪莹 胡辉[1] GUO Yutong;BAO Haiyi;YUAN Jiamin;TANG Mingliang;YANG Xueying;HU Hui(School of Environmental Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074)

机构地区：[1]华中科技大学环境科学与工程学院

出　　处：《环境科学学报》2020年第2期492-496,共5页Acta Scientiae Circumstantiae

基　　金：华中科技大学重点基金(No.2172015ZDTD063)

摘　　要：以三乙烯四胺(TETA)为阳离子前驱体、氟硼酸(HBF4)为阴离子前驱体制备多胺基离子液体[TETAH]+[BF4]^-,并与助溶剂乙二醇(EG)按一定计量比组成[TETAH]+[BF4]^--EG混合体系.实验考察了离子液体的浓度、吸收温度和气体流量等对该混合体系吸收CO2性能的影响.结果表明,当[TETAH]^+[BF4]^-的浓度为20%,吸收温度为15℃,气体流量为200 mL·min^-1时,该混合体系对CO2的吸收容量达到1.50 mol·mol^-1(以每mol离子液体吸收的CO2量(mol)计,下同);离子液体的浓度、CO2流量和温度均会影响该混合体系达到吸收平衡的时间.同时,该混合体系对CO2的吸收容量均高于[TETAH]+[BF4]^-和EG单独吸收CO2的容量,这表明离子液体[TETAH]^+[BF4]^-与助溶剂EG之间存在某种协同作用.另外,该混合体系具有良好的再生性能,在80℃的条件下经过5次吸收-解吸循环实验后的吸收摩尔分率为1.00 mol·mol^-1,性能下降仅为33.3%.CO2 capture is seen as an effective method to control CO2 emission and has received extensive attention. Polyamine-based ionic liquid [TETAH]+[BF4]^- can be synthesized and mixed with ethylene glycol(EG) to form a mixed solvent to capture CO2. In this study, we conducted experiments to study the influence of ionic liquid concentration, absorption temperature and gas flow on the capacity of such mixed solvent to absorb CO2. The results indicated that ionic liquid concentration, absorption temperature and gas flow had clear impacts on the speed of reaching the equilibrium of CO2 absorption. The maximum absorption rate of the mixed solvent was achieved at a level of 1.50 mol·mol^-1 when the ionic liquid concentration was 20%, the absorption temperature was 15 ℃ and the gas flow was 200 mL·min^-1. The CO2 absorption capacity of the mixed solvent was found greater than that of either [TETAH]^+[BF4]^- or EG, indicating potential synergetic mechanisms between [TETAH]+[BF4]^- and EG on improving the absorption capacity. Moreover, the mixed solvent had decent capability to maintain the absorption capacity at high temperature levels. After five times of absorption-desorption experiments at 80 ℃, the maximum absorption capacity only reduced by 33.3%.

关 键 词：离子液体 助溶剂 混合体系 吸收 再生 CO2 

分 类 号：X701[环境科学与工程—环境工程]