What is the current production process for cresol in China?
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I would like to ask the experienced experts here: is the sulfuric acid sulfonation method still the process used for producing p-cresol in China at present? What is the approximate composition of the o-, m-, and p-cresol components in the resulting cresol mixture? And does the product produced need to be purified by distillation to remove o-cresol first? I have reviewed relevant literature, which is quite old; I hope to learn from all of you about the current production situation. Thank you!
What about the diazotization and hydrolysis of p-toluidine?
Is this method a commonly used production method in China? Why are there few records of it in the literature? Is it a relatively new production method? I would like to ask you again: what are the respective proportions of the ortho and meta components in the products produced by this method? Thank you for your answer.
Currently, in China, p-cresol is mainly produced using the toluene alkali fusion sulfonation method. It depends on whether you use pre-crystallization or post-crystallization. Pre-crystallization involves removing o-cresol and m-cresol in advance. Post-crystallization is the final cryogenic crystallization to remove m-cresol!
What I’ve seen includes tolsulfonation, alkali fusion, acidification, distillation, continuous rectification, crystallization, and batch rectification