Solubilities of p-Toluenesulfonic Acid Monohydrate and Sodium p-Toluenesulfonate in Aqueous Sulfuric Acid Solutions and Its Application for Preparing Sodium p-Toluenesulfonate
2013
Zhao, Wen | Zou, Wei | Liu, Tong | Zhang, Feng-Bao | Zhang, Guo-Liang | Xia, Qing
The solubilities of p-toluenesulfonic acid monohydrate (PTSA·H₂O) and sodium p-toluenesulfonate (NaPTS) in aqueous sulfuric acid solutions were investigated at a temperature range from 278.45 to 342.95 K. The experimental results showed that the solubilities of PTSA·H₂O and NaPTS in aqueous sulfuric acid solutions increased with temperature from 278.45 to 342.95 K and decreased with sulfuric acid concentrations from 0 to 0.7. The experimental data were correlated with the modified Apelblat equation. The calculated results showed good agreement with the experimental data. A new strategy which sodium sulfate was used as a starting material in the preparation of NaPTS was profiled according to the solubility difference between PTSA·H₂O and NaPTS. In the continuous preparation of NaPTS, the favorable mole ratio (PTSA·H₂O to sodium sulfate) is chosen as 4.0, and the optimum operation conditions of the recycle process were determined, which improved the present process of 4-methylphenol production.
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