Process for preparation of 3-methoxy-4-hydroxybenzaldehyde

Details Process for preparation of 3-methoxy-4-hydroxybenzaldehyde Process for preparation of 3-methoxy-4-hydroxybenzaldehyde

1977-06-08

1979-04-24

Helfin, Bernard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

210 66, C07C 4500

Patent

active

041512073

ABSTRACT:
A process for the production of vanillin, 3-methoxy-4-hydroxy-benzaldehyde comprising ultrafiltrating a waste sulfite liquor to obtain a concentrated lignin-rich fraction, and oxidizing said fraction by convention procedures. Advantages of the process are increased yields of vanillin and reduction or avoidance of scale formation on production equipment.

REFERENCES:
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd ed., vol. 21 (1970) 186-190.

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