Thermodynamic Models for Determination of the Solubility of Sulfanilic Acid in Different Solvents at Temperatures from (278.15 to 328.15) K

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• 作者：Yonghong Hu ; Qi Zhang ; Ying Shi ; Yang Yang ; Limin Cheng ; Cuicui Cao ; Wenge Yang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：November 13, 2014
• 年：2014
• 卷：59
• 期：11
• 页码：3938-3943
• 全文大小：249K
• ISSN：1520-5134

文摘

Data on corresponding solid鈥搇iquid equilibria of sulfanilic acid in different organic solvents are essential for industrial design and further theoretical studies. In this study, the solubilities of sulfanilic acid were measured in methanol, ethanol, 2-propanol, acetone, acetonitrile, formic acid, and acetic acid with the temperature range of (278.15 to 328.15) K by the analytical stirred-flask method under atmospheric pressure. For the temperature range investigated, the solubility of sulfanilic acid in the solvents increased with increasing temperature. The thermodynamic models, such as the van鈥檛 Hoff model, the modified Apelblat model, and the Buchowski鈥揔siazaczak 位h model were investigated to describe the experimental data. It was found that the modified Apelblat model was the most suitable for predicting the solubility behavior of sulfanilic acid with increasing temperature. The calculated thermodynamic parameters indicated that in each studied solvent the dissolution process of sulfanilic acid is endothermic.