Determination and Correlation of the Solubility of Sodium Naphthalene-1,5-disulfonate in Five Pure Solvents and Three Binary Solvent Systems at the Temperature Range from 283.15 to 323.15 K

Abstract

Experimental solubility data of sodium naphthalene-1,5-disulfonate in five neat solvents (water, methanol, ethanol, 2-propanol, acetone) and three binary solvent systems (water + ethanol, water + 2-propanol, water + acetone) at different temperatures from 283.15 to 323.15 K were determined by the gravimetric method. The experimental results showed that three kinds of polymorphs appeared in the investigated solvent systems, and the solubility of sodium naphthalene-1,5-disulfonate all increased with increasing temperature and water content. According to the data measured, water was suitable to be the positive solvent, while methanol was considered to be a less-effective antisolvent due to its relatively large dissolving capacity. By means of our research, the solubility of sodium naphthalene-1,5-disulfonate in the neat solvents had a relation with the polarity of the solvents. The solubilities of sodium naphthalene-1,5-disulfonate were fitted by the modified Apelblat, Jouyban-Acree, van’t Hoff-Jouyban-Acree, and Apelblat-Jouyban-Acree models. The results showed that the four models can predict the experimental values very well.