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The solid-liquid phase equilibrium and the solubility data for the ternary sodium 3-nitrobenzenesulphonate + sodium 4-nitrobenzenesulphonate + water system at 283.15 K, 303.15 K and 323.15 K were determined experimentally. The solid–liquid phase diagrams were constructed. In addition, the densities of equilibrium liquid phase were obtained. The solid phase was confirmed by Schreinemaker’s method of wet residues. Two solid phases were formed in the ternary sodium 3-nitrobenzenesulphonate + sodium 4-nitrobenzenesulphonate + water system at 283.15 K and 303.15 K, which corresponded to sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate; while at 323.15 K, the three solids were formed, which corresponded to sodium 3-nitrobenzenesulphonate, sodium 4-nitrobenzenesulphonate and adduct A. At temperature of 283.15 K or 303.15 K, the phase diagram has three crystallization fields, two univariant curves and one invariant point. At temperature of 323.15 K, the phase diagram has four crystallization fields, three univariant curves and two invariant points. The solubility data and the ternary phase diagram for the system sodium 3-nitrobenzenesulphonate + sodium 4-nitrobenzenesulphonate + water at 283.15 K, 303.15 K and 323.15 K can provide the fundamental basis for preparation of sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate from sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate isomeric mixtures. At 323.15 K, the approximate solid-phase component for adduct of sodium 3-nitrobenzenesulphonate with sodium 4-nitrobenzenesulphonate, in which the mole ratio of the two compositions is 1:1, formed in the ternary system. |
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- 金币: 1738.9
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