Abstract
Para-toluene sulfonic acid is a typical intermediary for the synthesis of pharmaceuticals, pesticides, and dyes and is a catalyst for organic synthesis. The consumption of para-toluene sulfonic acid used in organic synthesis has increased substantially. The toluene sulfonation process is the central path for synthesizing para-toluene sulfonic acid in China. However, the process has risks and has resulted in numerous disasters. This study utilized a reaction calorimeter 1 to reproduce the commercial toluene sulfonation process in a laboratory. The para-toluene sulfonic acid product was examined with an accelerating rate calorimeter and through differential scanning calorimetry. Both differential and integral isoconversional methods were used to determine the thermal stability of and appropriate thermokinetic models for para-toluene sulfonic acid. The safety parameters of para-toluene sulfonic acid were estimated. The research findings can be used for optimization of the toluene sulfonation process and for safe handling of para-toluene sulfonic acid.
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