Abstract Water-lean amino acid salt (AAS) solutions have attracted special attentions for energy-efficient CO2 absorbents. In this work, 2-methoxyethanol was proposed as a novel anti-solvent due to its excellent properties such as low volatility, low specific heat capacity and low viscosity. Density and viscosity were measured at atmospheric pressure for water-lean blends of potassium sarcosinate (SarK) or potassium L-prolinate (ProK)/water/2-methoxyethanol over the temperature range from (293 to 353) K and the AAS molality up to 4.914 mol·kg−1. Partially CO2 loaded solutions were also investigated. Equilibrium solubility of CO2 in AAS/water/2-methoxyethanol solutions was measured in a stirred equilibrium cell at temperatures of (313, 333 and 373) K and CO2 partial pressures up to 190 kPa. These property data were correlated using empirical correlations as a function of AAS molality, CO2 molality and/or temperature. The predicted values of density and viscosity matched well with the measured data, with AADs within 0.31% for density and 3.76% for viscosity. The solubility data of CO2 were fairly fitted with a proposed Soft model.

中文翻译：

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用于 CO2 捕获的氨基酸盐和 2-甲氧基乙醇的贫水混合混合物：CO2 的密度、粘度和溶解度

摘要 贫水氨基酸盐 (AAS) 溶液作为节能型 CO2 吸收剂引起了人们的特别关注。在这项工作中，2-甲氧基乙醇因其低挥发性、低比热容和低粘度等优异特性而被提出作为一种新型抗溶剂。在大气压下测量肌氨酸钾 (SarK) 或 L-脯氨酸钾 (ProK)/水/2-甲氧基乙醇的贫水混合物的密度和粘度，温度范围为 (293 至 353) K，AAS 摩尔浓度高达4.914 mol·kg-1。还研究了部分加载 CO2 的溶液。CO2 在 AAS/水/2-甲氧基乙醇溶液中的平衡溶解度是在搅拌平衡池中在（313、333 和 373）K 的温度和高达 190 kPa 的 CO2 分压下测量的。这些特性数据使用经验相关性作为 AAS 摩尔浓度、CO 2 摩尔浓度和/或温度的函数进行关联。密度和粘度的预测值与测量数据匹配良好，密度的 AAD 在 0.31% 以内，粘度在 3.76% 以内。CO2 的溶解度数据与建议的 Soft 模型相当吻合。