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郭雨桐,包海艺,袁佳敏,汤明亮,杨雪莹,胡辉.离子液体[TETAH]⁺[BF₄]^--乙二醇混合体系吸收CO₂的实验研究[J].环境科学学报,2020,40(2):492-496

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

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%.

Abstract：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%.