This work reports equilibrium data for two amines, 2-piperidineethanol (2-PPE) and 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD), and their aqueous solutions. The pressure, temperature, and composition data are used to calculate experimental activities. Data cover temperatures from 363 to 426 K for the pure amines and from 323 to 373 K for the aqueous solutions. A UNIQUAC model was used to represent the binary vapor–liquid equilibria (VLE), whereas the Antoine equation was used for pure components. In an aqueous solution, the vapor pressure of 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD) over the measured composition and temperature ranges is higher than that of 2-piperidineethanol (2-PPE). The developed UNIQUAC models represent the data well. For 2-piperidineethanol (2-PPE), the model gave 1.9% deviations for total pressure, 12.4% for vapor-phase composition, 12.7% for the calculated activity coefficients, and 16.2% for the excess heat capacity. In the case of 1-(2-hydroxyethyl)pyrrolidine (1-(2HE)PRLD), the model was slightly more accurate, representing the data with 1.7% deviation for total pressure, 5.9% for vapor-phase composition, and 5.2% for the calculated activity coefficient.

中文翻译：

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2-哌啶乙醇和 1-(2-羟乙基)吡咯烷在水溶液中的汽液平衡数据和 UNIQUAC 模型表示

这项工作报告了两种胺、2-哌啶乙醇 (2-PPE) 和 1-(2-羟乙基)吡咯烷 (1-(2HE)PRLD) 及其水溶液的平衡数据。压力、温度和成分数据用于计算实验活动。数据涵盖纯胺的 363 至 426 K 的温度和水溶液的 323 至 373 K 的温度。UNIQUAC 模型用于表示二元气液平衡 (VLE)，而 Antoine 方程用于表示纯组分。在水溶液中，1-(2-羟乙基)吡咯烷 (1-(2HE)PRLD) 在测量的组成和温度范围内的蒸气压高于 2-哌啶乙醇 (2-PPE)。开发的 UNIQUAC 模型很好地代表了数据。对于 2-哌啶乙醇 (2-PPE)，模型给出的总压力偏差为 1.9%，12。气相成分为 4%，计算的活度系数为 12.7%，过热容量为 16.2%。在 1-(2-羟乙基)吡咯烷 (1-(2HE)PRLD) 的情况下，模型稍微更准确，代表数据的总压力偏差为 1.7%，气相成分偏差为 5.9%，气相成分偏差为 5.2%为计算的活动系数。