Experimental determination and thermodynamic modeling of solid–liquid-phase equilibrium for the 3-nitrotoluene and 4-nitrotoluene binary system
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Solid–liquid-phase equilibrium is an important part of chemical thermodynamics, and its basic theoretical research plays a vital role in the advancement of the chemical industry. Solid–liquid equilibria for binary mixtures of 3-nitrotoluene and 4-nitrotoluene were measured using differential scanning calorimetry under atmospheric pressure (101.3 kPa). The results showed that the phase diagram of the 3-nitrotoluene + 4-nitrotoluene binary system presented a eutectic behavior, and the eutectic point was x1 = 0.6487, TE = 272.15 K. Furthermore, the experimental results were correlated with Wilson and nonrandom two-liquid (NRTL) activity coefficient models well. The relative standard deviations were 0.496 and 0.236, respectively, and the absolute mean deviations were 0.005 and 0.001, respectively.
KeywordsEutectic behavior DSC analysis Phase diagram Solid–liquid equilibria
This work was supported by the Key Technology Support Program of Qinghai Province (No. 215-GX-109A); Natural Science Foundation of Tianjin Municipality (18JCYBJC21200); National Natural Science Foundation of China (U1407204); Yangtze Scholars and Innovative Research Team in Chinese University (IRT-17R81); and the Innovative Research Team of Tianjin Municipal Education Commission (TD12-5004).
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