Solution Thermodynamics of Caprolactam in Different Monosolvents,Journal of Chemical & Engineering Data

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Solution Thermodynamics of Caprolactam in Different Monosolvents
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-01 , DOI: 10.1021/acs.jced.0c00741
Song Guo ₁ , Wei Su _{1,

2} , Hongxun Hao _{1,

2} , Yanan Luan ₁ , Xin Li ₁ , Siyang Gao ₃ , Xin Huang _{1,

2}

Affiliation

In this work, the solubility data of caprolactam (CPL) in 18 solvents were measured from 278.15 to 313.15 K by a static gravimetric method. The results illustrated that with increasing temperature, solubility of CPL increased. The solubility in 2-methoxyethanol is the highest, whereas the lowest for n-Heptane. Additionally, the modified Apelblat equation, the nonrandom two-liquid (NRTL) model, and the λh equation were used to fit solubility data of CPL obtained in all of the 18 solvents by experimental methods. It can be seen from the results that all of the four selected models could provide preferable fitting results with average relative deviation lower than 5%. Furthermore, the thermodynamic properties of CPL during the dissolving process were also calculated and analyzed based on the NRTL model and experimental solubility data, including the enthalpy change, the Gibbs energy change, and the entropy change during the dissolution process.

中文翻译：

己内酰胺在不同单溶剂中的溶液热力学

在这项工作中，通过静态重量法在278.15至313.15 K范围内测量了己内酰胺（CPL）在18种溶剂中的溶解度数据。结果表明，随着温度的升高，CPL的溶解度增加。在2-甲氧基乙醇中的溶解度最高，而对于正庚烷的溶解度最低。此外，经修饰的Apelblat方程，非随机双液体（NRTL）模型，和λ ħ方程用于拟合通过实验方法在所有18种溶剂中获得的CPL的溶解度数据。从结果可以看出，所有四个选定模型都可以提供较好的拟合结果，且平均相对偏差低于5％。此外，还基于NRTL模型和实验溶解度数据计算和分析了CPL在溶解过程中的热力学性质，包括溶解过程中的焓变，吉布斯能量变化和熵变。

更新日期：2021-01-14

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