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Solid–Liquid Equilibrium for the Ternary System 2-Methyl-4-Nitroaniline + 2-Methyl-6-Nitroaniline + Ethyl Acetate: Determination and Modelling

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Abstract

The solid–liquid phase equilibria for the ternary system 2-methyl-4-nitroaniline + 2-methyl-6-nitroaniline + ethyl acetate was determined experimentally by the method of isothermal solution saturation at temperatures of (293.15, 303.15 and 313.15) K under the pressure of 101.2 kPa. Based on the obtained solubility data, the isothermal phase diagrams of the system were constructed. At each temperature, there are two pure solid phases formed, which correspond to pure 2-methyl-4-nitroaniline and pure 2-methyl-6-nitroaniline, which was confirmed by Schreinemakers’ wet residue method and X-ray powder diffraction. The crystallization regions of pure 2-methyl-4-nitroaniline and pure 2-methyl-6-nitroaniline increased with decreasing temperature. The crystalline region of 2-methyl-4-nitroaniline was larger than that of 2-methyl-6-nitroaniline at a fixed temperature. The solubility data were correlated with the NRTL and Wilson models. The values of the root-mean-square deviations are 5.01 × 10−3 for the NRTL model, and 6.43 × 10−3 for the Wilson model. The solid–liquid equilibria, phase diagrams and the thermodynamic models for the ternary system can provide the foundation for separating 2-methyl-6-nitroaniline or 2-methyl-4-nitroaniline from its mixtures.

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Acknowledgements

This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. School of Environmental & Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, Henan, People’s Republic of China

    Li Xinbao

  2. College of Chemistry & Chemical Engineering, YangZhou University, Yangzhou, 225002, Jiangsu, People’s Republic of China

    Yang Cong & Hongkun Zhao

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  1. Li Xinbao
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  2. Yang Cong
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  3. Hongkun Zhao
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Correspondence to Hongkun Zhao.

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Xinbao, L., Cong, Y. & Zhao, H. Solid–Liquid Equilibrium for the Ternary System 2-Methyl-4-Nitroaniline + 2-Methyl-6-Nitroaniline + Ethyl Acetate: Determination and Modelling. J Solution Chem 47, 231–245 (2018). https://doi.org/10.1007/s10953-017-0707-7

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