C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/574.3
C07C 47/58 (2006.01) C07C 45/00 (2006.01)
Patent
CA 1121384
Abstract of the Disclosure A method for the preparation of vanillin from lignosulphonate is disclosed herein. The lignosulphonate used as raw material is ob- tained in connection with sulphite pulping. For the preparation of vanillin only such a portion of said lignosulphonate is used the molecular weight of which exceeds by more than 50 per cent the value 5000. The vanillin is prepared from said raw material in a manner known per se by oxidation and alcohol extractions. The vanillin ob- tained is then reacted with sulphur dioxide in order to give the bisulphite complex of vanillin. The bisulphite complex formed is decomposed by adding an alakali and extracted during the decomposi- tion or immediately thereupon with an organic solvent. The solu- tion is washed with slighty alkaline water and the organic solvent is thereafter evaporated in a low vacuum to get crude vanillin.
341137
Swabey Ogilvy Renault
Yhtyneet Paperitehtaat Oy
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