Process for producing anthraquinone-1-sulphonic acid by sulphona

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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502201, 502339, C07C14336

Patent

active

047117435

ABSTRACT:
A process for the production of anthraquinone-1-sulphonic acid by sulphonating anthraquinone with a sulphonating agent in the presence of palladium catalyst in a solvent, is characterized in that before sulphonation, the palladium is mixed with nitric acid or mineral acids containing nitric acid at room temperature and then the acid is removed from the treated palladium. Preferably, the sulphonating agent of 1-10% SO.sub.3 is first mixed with the nitric acid treated palladium as a solvent, and the same sulphonating agent of 50-65% SO.sub.3 is added for sulphonation at about 90-100 degs. C.

REFERENCES:
patent: 3763191 (1973-10-01), Schmitz et al.

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