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文章编号: 1672-6987(2023)05-0043-09; DOI: 10.16351/j.1672-6987.2023.05.005
王宁, 杨园园, 程华农*, 郑世清(青岛科技大学 化工学院, 山东 青岛 266042)
摘要: 测定了温度29815~33815 K、压力0~900 kPa下,CO2在质子型离子液体N-乙基吗啉乙酸盐(\[NEMH\]\[Ac\])中的溶解度。采用Soave-Redlich-Kwong(SRK)立方型状态方程对溶解度数据进行拟合,平均相对偏差和最大相对偏差分别为094%和286%,具有满意的准确性。通过溶解度数据,估算了CO2在\[NEMH\]\[Ac\]中零压力下的亨利定律常数,并计算了无限稀释条件下的偏摩尔吉布斯自由能、偏摩尔焓和偏摩尔熵。结果表明,\[NEMH\]\[Ac\]对CO2的亲和力,以及CO2在\[NEMH\]\[Ac\]中的有序度随着温度的升高而降低。CO2在\[NEMH\]\[Ac\]中的溶解是放热的,有利于CO2的溶解。相对现有的醇胺法工艺,CO2的解吸能耗较低,吸收剂更容易再生。
关键词: 二氧化碳; 离子液体; 溶解度; 模型; 亨利定律常数
中图分类号: TQ 013.1文献标志码: A
引用格式: 王宁, 杨园园, 程华农, 等. CO2在离子液体N-乙基吗啉乙酸盐中的溶解度[J]. 青岛科技大学学报(自然科学版), 2023, 44(5): 43-51.
WANG Ning, YANG Yuanyuan, CHENG Huanong, et al. Solubility of CO2 in ionic liquid N-ethylmorpholine acetate[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2023, 44(5): 43-51.
Solubility of CO2 in Ionic Liquid N-Ethylmorpholine Acetate
WANG Ning, YANG Yuanyuan, CHENG Huanong, ZHENG Shiqing
(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: The solubility of CO2 in protic ionic liquid N-ethylmorpholine acetate (\[NEMH\]\[Ac\]) was determined at temperatures from 29815 to 33815 K and pressures from 0 to 900 kPa. The Soave-Redlich-Kwong (SRK) cubic equation of state was used to fit the solubility data, and the average relative deviation and maximum relative deviation were 094% and 286%, respectively, with satisfactory accuracy. From the solubility data, the Henry′s law constant for CO2 at zero pressure in \[NEMH\]\[Ac\] was estimated, and the partial molar Gibbs free energy, partial molar enthalpy, and partial molar entropy at infinite dilution were calculated. The results showed that the affinity of \[NEMH\]\[Ac\] for CO2 and the order degree of CO2 in \[NEMH\]\[Ac\] decreased with increasing temperature. The dissolution of CO2 in \[NEMH\]\[Ac\] is exothermic, favoring the dissolution of CO2. Compared with the existing alcoholamine process, the energy consumption of CO2 desorption is lower, and the absorbent is easier to regenerate.
Key words: carbon dioxide; ionic liquid; solubility; modeling; Henry′s law constant
收稿日期: 2022-09-02
基金项目: 山东省自然科学基金项目(ZR2020MB145).
作者简介: 王宁(1997—), 男, 硕士研究生.*通信联系人.