METHOD FOR ISOLATION OF VANILLIN AND SYRINGALDEHYDE

摘要

FIELD: industrial organic synthesis. SUBSTANCE: vanillin and syringaldehyde are isolated from solution obtained after oxidation of lignin-containing material using extraction with high-boiling alcohols or esters with boiling temperatures above 139 C carried out at pH 6.0- 8.0, after which product is reextracted with water-alkali solution at pH 10-14. Vanillin is isolated by acidification by sulfuric acid to pH 5. EFFECT: optimized isolation procedure. 8 ex