Below the room temperature measurements of CO2 solubilities in six physical absorbents
Below the room temperature measurements of CO2 solubilities in six physical absorbents
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室温以下六种物理吸收剂中二氧化碳溶解度的测量
DOI：
10.1016/j.jct.2018.03.009
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发表时间：
2018-07-01
影响因子：
2.6
通讯作者：
Yang, Jie
中科院分区：
文献类型：
--
作者：
Li, Yun;Chen, Xue;Yang, Jie
建立了等温合成装置作为吸收装置。选择了6种含醚和酯基的物理吸附剂：乙二醇甲醚乙酸酯(EGMEA)、丙二醇甲醚乙酸酯(PGMEA)、3-甲氧基丁酸乙酯(MBA)、二乙二醇二乙醚(DGDE)、乙二醇丁醚乙酸酯(EGBEA)和醋酸卡比特(CA)。在273.15-283.15 K的温度和1.2兆帕的压力下，测量了二氧化碳在所选择的吸收剂中的溶解度。回归了273.15 K和283.15 K下Co2+选择性吸收体系的亨利常数，并与高温下的亨利常数进行了比较。结果表明，降低温度对提高吸附能力有很大影响。并与其他溶剂和离子液体的亨利常数和体积溶解度进行了比较，以判断其吸附能力。按摩尔分数和体积分数计算，CA和EGMEA分别是相对较好的吸附剂，具有潜在的CO2捕集价值。为了研究吸附行为，计算和评价了所选体系的热力学性质，如溶液的熵、溶液的热焓和溶液的吉布斯自由能。(C)2018年爱思唯尔有限公司。
An isothermal synthetic apparatus was established as the absorbing device. Six physical absorbents with ether and ester groups were selected: ethylene glycol methyl ether acetate (EGMEA), propylene glycol methyl ether acetate (PGMEA), 3-methoxy butyl acetate (MBA), diethylene glycol diethyl ether (DGDE), ethylene glycol butyl ether acetate (EGBEA) and carbitol acetate (CA). CO2 solubilities in the selected absorbents were measured at temperatures of 273.15-283.15 K, and pressures up to 1.2 MPa. Henry's constants of CO2 + selected absorbents systems at 273.15 K and 283.15 K were regressed and compared with those at higher temperature. It turned out that decreasing the temperature has a large effect on improving absorption capacity. Henry's constants and volumetric solubilities of the selected absorbents were compared with other solvents and ionic liquids for the purpose of judging the absorption capacity. CA and EGMEA were found to be relatively good absorbents by mole and volumetric fraction respectively, and they have potential value for CO2 capture. In order to study absorption behavior, thermodynamic properties such as entropy of solution, enthalpy of solution and Gibbs free energy of solution for the selected systems were calculated and assessed. (C) 2018 Elsevier Ltd.