Process for the extraction of vanillin

Details Process for the extraction of vanillin Process for the extraction of vanillin

1988-12-27

1990-02-06

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 4590

Patent

active

048989908

ABSTRACT:
A process for the extraction of vanillin by means of the extraction from a vanillin-containing, water-containing, liquid mixture of substances with carbon dioxide at a temperature of 0.degree. to 110.degree. C. as well as a pressure of 30 to 400 bar and a subsequent separation of vanillin is described. It is contemplated that with this process the vanillin-containing carbon dioxide is passed through an aqueous hydrogen sulfite- or sulfite-solution at the extraction temperature and the extraction pressure, that this solution is subsequently acidified with sulfuric acid to a pH value of 2 to 4, and that the vanillin-free carbon dioxide is fed back into the extraction stage.

REFERENCES:
patent: 2069815 (1937-01-01), Hibbert
patent: 2544562 (1951-03-01), Michael
patent: 4021493 (1977-05-01), Major
patent: 4474994 (1984-10-01), Makin

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