Vanillin recovery process

Details Vanillin recovery process Vanillin recovery process

1975-09-08

1977-05-03

Helfin, Bernard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4524

Patent

active

040214931

ABSTRACT:
A process is provided for isolating vanillin from alkaline aqueous solutions containing unwanted, chemically-related phenolic impurities, such as orthovanillin, acetovanillone, para-hydroxybenzaldehyde, syringaldehyde and the like, wherein the alkaline aqueous solution is subjected to an extractive process including as a step, extractive bisulfitation. The step of extractive bisulfitation involves the formation of an alkali-metal bisulfite complex of vanillin in the presence of a substantially water-insoluble organic solvent, such as a water-insoluble alkanol, e.g., normal-butyl alcohol.

REFERENCES:
patent: 2057117 (1936-10-01), Sandborn et al.
patent: 3049566 (1962-08-01), Schoeffel

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