Determination of the solubility, dissolution enthalpy and entropy of 2,4-diaminotoluene, methyl 3-amino-4-methyl-N-phenyl carbamate and dimethyl toluene-2,4-dicarbamate in different solvents

IF 2.2 3区工程技术 Q3 CHEMISTRY, PHYSICAL Journal of Chemical Thermodynamics Pub Date : 2024-01-21 DOI:10.1016/j.jct.2024.107261

Yucong Song, Mingchuan Pang, Xiaoshu Ding, Guirong Wang, Xinqiang Zhao, Yanji Wang

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Abstract

The solubilities of 2,4-diaminotoluene (2,4-TDA), methyl 3-amino-4-methyl-N-phenyl carbamate (4-TMC) and dimethyl toluene-2,4-dicarbamate (2,4-TDC) in dimethyl carbonate (DMC) and di(2-ethylhexyl) phthalate (DOP) were determined by dynamic method at 298.15 ∼ 398.15 K under atmospheric pressure. The solubility data were correlated by the modified Apelblat equation, polynomial equation and simplified two-parameter equation. The modified Apelblat equation was more accurate than the others. In addition, the thermodynamic properties of the solution process, including the Gibbs energy, enthalpy and entropy were calculated by the modified Van't Hoff equation. The dissolution process of 2,4-TDC in DOP solvent is a non-spontaneous entropy reduction endothermic process. The dissolution processes of 2,4-TDA, 4-TMC and 2,4-TDC in DMC solvent and 2,4-TDA and 4-TMC in DOP solvent are all non-spontaneous entropy-increasing endothermic processes.

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测定 2,4-二氨基甲苯、3-氨基-4-甲基-N-苯基氨基甲酸甲酯和甲苯-2,4-二氨基甲酸二甲酯在不同溶剂中的溶解度、溶解焓和溶解熵

在 298.15 ∼ 398.15 K 的常压条件下，采用动态法测定了 2,4-二氨基甲苯（2,4-TDA）、3-氨基-4-甲基-N-苯基氨基甲酸甲酯（4-TMC）和甲苯-2,4-二氨基甲酸二甲酯（2,4-TDC）在碳酸二甲酯（DMC）和邻苯二甲酸二（2-乙基己基）酯（DOP）中的溶解度。溶解度数据通过修正的 Apelblat 方程、多项式方程和简化的双参数方程进行相关分析。修正的阿佩尔布拉特方程比其他方程更精确。此外，溶解过程的热力学性质，包括吉布斯能、焓和熵，也是通过改进的 Van't Hoff 方程计算得出的。2,4-TDC 在 DOP 溶剂中的溶解过程是一个非自发的熵减内热过程。在 DMC 溶剂中，2,4-TDA、4-TMC 和 2,4-TDC 的溶解过程；在 DOP 溶剂中，2,4-TDA 和 4-TMC 的溶解过程都是非自发的熵增内热过程。

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来源期刊

Journal of Chemical Thermodynamics 工程技术-热力学

CiteScore

5.60

自引率

15.40%

发文量

199

审稿时长

79 days

期刊介绍： The Journal of Chemical Thermodynamics exists primarily for dissemination of significant new knowledge in experimental equilibrium thermodynamics and transport properties of chemical systems. The defining attributes of The Journal are the quality and relevance of the papers published. The Journal publishes work relating to gases, liquids, solids, polymers, mixtures, solutions and interfaces. Studies on systems with variability, such as biological or bio-based materials, gas hydrates, among others, will also be considered provided these are well characterized and reproducible where possible. Experimental methods should be described in sufficient detail to allow critical assessment of the accuracy claimed. Authors are encouraged to provide physical or chemical interpretations of the results. Articles can contain modelling sections providing representations of data or molecular insights into the properties or transformations studied. Theoretical papers on chemical thermodynamics using molecular theory or modelling are also considered. The Journal welcomes review articles in the field of chemical thermodynamics but prospective authors should first consult one of the Editors concerning the suitability of the proposed review. Contributions of a routine nature or reporting on uncharacterised materials are not accepted.