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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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