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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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-轩影鳶: 金币+15, 翻译EPI+1, ★★★★★最佳答案 2012-04-23 20:50:29
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固液相平衡和3-硝基苯磺酸钠和4-硝基苯磺酸钠和水的三元系统283.15k， 303.15k和323.15k的溶解度在已进行实验测定。固–液相图已构建。此外，平衡液相的密度已得到。固相用schreinemaker的湿残留法确认了。283.1k和303.15k时的3-硝基苯磺酸钠和4-硝基苯磺酸钠和水的三元系统中有两种固体形成，这相对应于3-硝基苯磺酸钠与4-硝基苯磺酸钠；而在323.15k时三中固体形成，这相当于3-硝基苯磺酸钠与4-硝基苯磺酸钠和加合物A。在温度为283.15k或303.15k下，该相图有三个结晶区，2条单变量曲线和一个无变量点。在温度为323.15k时，相图有四个结晶区，3条单变量曲线和2个无变量点。 3-硝基苯磺酸钠和4-硝基苯磺酸钠和水的三元系统在283.15k， 303.15k和323.15k温度下的溶解度可为从3-硝基苯磺酸钠和4-硝基苯磺酸钠同分异构体的混合物中制备3-硝基苯磺酸钠和4-硝基苯磺酸钠提供基本依据。在323.15K，近似固相成分3-硝基苯磺酸钠和4-硝基苯磺酸钠加合物，其中两种物质的摩尔比是1 : 1，形成了三元体系。 |
2楼2012-04-23 20:13:43
