Thermodynamic analysis of temperature dependence of the crystal growth rate of potassium sulfate

Fangqin Cheng, Yang Bai, Chang Liu, Xiaohua Lu*, Chuan Dong

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this work, the effect of temperature on the crystal growth rate of potassium sulfate in aqueous K 2 SO 4 and KCl-K 2 SO 4 solutions is analyzed. The crystal growth rate equation of K 2 SO 4 is developed on the basis of the difference of chemical potentials of K 2 SO 4 at the solid-liquid interface. The Lu-Maurer model is used to predict the activity coefficient of K 2 SO 4 . The crystal growth rate of K 2 SO 4 in aqueous K 2 SO 4 solution decreases, then increases with increasing temperature, and reaches its lowest value around 303.15 K, which is in accordance with previous experimental results. Meanwhile, the optimal crystallization temperature of K 2 SO 4 in aqueous KCl-K 2 SO 4 solution is discussed. An effective method is found to increase the yield of K 2 SO 4 by increasing the crystallization temperature to 333.15 K.

Original languageEnglish
Pages (from-to)6266-6271
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume45
Issue number18
DOIs
Publication statusPublished - 1 Aug 2006

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