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As one of the most important aromatic compounds, high purity of sodium 4-nitrobenzenesulphonate is widely used in nucleophilic substitution reaction,1 controlling of the mode of polymorphic transition,2 and effect of ionic liquids on a class of charge-neutral nucleophiles.3 It is in general produced by sulfonation of nitrobenzene with concentrated sulfuric acid. The isomeric mixtures are formed in various proportions of sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate with this method. The entire usage requires purified sodium 4-nitrobenzenesulphonate product. It is very difficult to separate sodium 4-nitrobenzenesulphonate at a high purity from this reaction product mixture. High-purity sodium 4-nitrobenzenesulphonate can be separated from the mixture of isomeric sodium nitrobenzenesulphonate by recrystallization from sodium chloride, sodium sulfate or ethanol aqueous solution. To purify sodium 4-nitrobenzenesulphonate using a simple method, measurements of the solubility data of sodium 4-nitrobenzenesulphonate in binary sodium chloride + water, sodium sulfate + water and ethanol + water solvent mixtures are needed. Although the solubility of sodium 4-nitrobenzenesulphonate in sodium chloride, sodium sulfate and ethanol aqueous solution is very important to the separation process, to the best of the authors’ present knowledge, solubility of sodium 4-nitrobenzenesulphonate has not been reported in literature.4-6 In this work,we measure the solubility of sodium 4-nitrobenzenesulphonate in binary sodium chloride + water, sodium sulfate + water and ethanol + water solvent mixtures using the steady-state method with the temperature range from (273.15 to 323.15) K.7-11 The data are correlated by a modified Apelblat equation.

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转弯为你相遇: 金币+25, 翻译EPI+1, ★★★★★最佳答案 2012-04-24 12:13:28
作为一个最重要的芳香族化合物,纯度高4-硝基苯磺酸钠被广泛使用于亲核取代反应,1控制多过渡态模式,2离子液体对一类中性亲核试剂的影响。3这是一般由用浓硫酸磺化硝基苯。这些异构体的混合物用各种比例的3-硝基苯磺酸钠和4-硝基苯磺酸钠通过这种方法形成的。整个使用需要纯化4-硝基苯磺酸钠产品。在这种反应产物混合物中很难分离出高纯度的4-硝基苯磺酸钠。可以从硝基苯磺酸钠异构体的混合物中分离得到高纯度的4-硝基苯磺酸钠,通过再结晶氯化钠,硫酸钠或乙醇水溶液。为了使用一个简单的方法净化4-硝基苯磺酸钠,测量4-硝基苯磺酸钠在二氯化钠与水,硫酸钠与水和乙醇与水混合二元溶剂中的溶解度是必要的。虽然4-硝基苯磺酸钠在氯化钠、硫酸钠和乙醇水溶液中的溶解度对中分离过程非常重要,但据作者所知4-硝基苯磺酸钠最好的溶解度尚未在文献中有所报道。4-6在这项工作中,在温度范围(273.15至323.15)k下,我们使用稳态方法测量了4-硝基苯磺酸钠在氯化钠与水,硫酸钠与水和乙醇与水的二元溶剂中的溶解度,7-11数据与apelblat修正方程相关。
如若这般,当初又为了什么?
2楼2012-04-24 12:11:28
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