The solubility of 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) in seven pure solvents, methanol, ethanol, 2-propanol, 1-butanol, isopentanol, acetone, and ethyl acetate, in the temperature range between 283.15 and 328.15 K at atmospheric pressure (101.3 kPa) is reported in this paper. The solubility of 2-acrylamido-2-methyl-1-propane-sulfonic acid increases with temperature in all selected solvents. The van’t Hoff equation, modified Apelblat equation, Wilson model, and λh model were applied to correct the solubility data. The results show that the modified Apelblat equation fits the best, with an average relative deviation of less than 3.70%. The mixing properties, such as Gibbs free energy, enthalpy and entropy of AMPS, were calculated based on the van’t Hoff equation. The dissolution process of AMPS in all solvents selected is endothermic, non-spontaneous and enthalpy-driven.

中文翻译：

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2-丙烯酰胺基-2-甲基-1-丙磺酸在七种纯溶剂中溶解度数据和溶解热力学数据的测定及相关性

2-丙烯酰胺基-2-甲基-1-丙磺酸（AMPS）在甲醇、乙醇、2-丙醇、1-丁醇、异戊醇、丙酮和乙酸乙酯七种纯溶剂中的溶解度，在283.15℃之间的温度范围内本文报道了大气压 (101.3 kPa) 下的 328.15 K。2-丙烯酰胺基-2-甲基-1-丙烷磺酸在所有选定溶剂中的溶解度随温度升高而增加。van't Hoff 方程、修正的 Apelblat 方程、Wilson 模型和 λh 模型用于校正溶解度数据。结果表明，修正后的Apelblat方程拟合效果最好，平均相对偏差小于3.70%。AMPS 的 Gibbs 自由能、焓和熵等混合特性是基于 van't Hoff 方程计算的。