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

C - Chemistry, Metallurgy

07

C

260/574.3

C07C 47/58 (2006.01) C07C 47/56 (2006.01)

Patent

CA 1071235

ABSTRACT OF THE DISCLOSURE Process for the production of 3-methoxy-4-hydroxy- benzaldehyde (vanillin) by air oxidation of a strongly alkaline lignin containing sulphite waste liquor in which the lignin content of the waste liquor is enriched by ultra-filtratlon for the purpose of inhibiting crusting of inorganic matter in the extraction system.

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