Process for the preparation of isomer-free toluene-4-sulfonic ac

Details Process for the preparation of isomer-free toluene-4-sulfonic ac Process for the preparation of isomer-free toluene-4-sulfonic ac

1979-12-05

1980-12-30

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14324

Patent

active

042422752

ABSTRACT:
Pure toluene-4-sulfonic acid is obtained without forming any by-products by sulfonating toluene with sulfuric acid at an elevated temperature, separating a first batch of toluene-4-sulfonic acid hydrate, washing it free of isomers with sulfuric acid, combining the mother liquor and the washing effluent, heating them, allowing a second batch of hydrate to crystallize and, optionally, working up the final mother liquor by hydrolizing the toluene sulfonic acids therein and recycling the toluene so formed and the sulfuric acid after concentrating it to its initial strength.

REFERENCES:
patent: 1311848 (1919-07-01), Lepers
Gilbert, "Sulf. & Related Reactions" (1965), pp. 71, 72.

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