Correction: Determination and Correlation of the Solubility of Ammonium Sulfate in Aqueous Solutions of Caprolactam with Different Concentrations
摘要
In order to explore the effect of caprolactam on the solubility of ammonium sulfate in water, the dynamic laser method was used to measure the solubility of ammonium sulfate in aqueous solutions of caprolactam with different concentrations at temperatures ranging from 293.15 to 333.15 K. The modified Apelblat equation, λh equation, and van’t Hoff–Yaws model were employed to correlate the experimental data. It was found that the average relative deviation (ARD) was less than 0.5%, demonstrating a good agreement between the fitted values and the experimental data. Thermodynamic analysis shows that the dissolution of ammonium sulfate in caprolactam aqueous solution is an endothermic process, and the solubility enthalpy of the dissolution estimation system was estimated to be about 2.50 kJ·mol−1. This study for the first time revealed the inhibitory effect of caprolactam on the solubility of ammonium sulfate, which provided a thermodynamic basis for the crystallization process. In the industrial process, the crystal size and crystallization efficiency of ammonium sulfate can be improved by setting appropriate caprolactam concentration and crystallization speed.