FIELD: chemistry.
SUBSTANCE: invention relates to a method of purifying vanillin obtained from lignin oxidation products, by reacting vinillin-containing extracts with aqueous solutions sodium bisulphite, followed by decomposition of the vanillin-bisulphite derivative. The method is characterised by that the vanillin-bisulphite derivative is heated in an autoclave to 120-170°C, the vapour-gas phase is released and vanillin is extracted from the obtained mixture or solution, followed by recycling the obtained aqueous solution of sulphurous anhydride and sodium sulphate into a solution of sodium bisulphite.
EFFECT: method enables to avoid the use of sulphuric acid and alkali when purifying vanillin, widely used in food, perfume, cosmetic and pharmaceutical industry.
5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF SEPARATING VANILLIN FROM LIGNIN OXIDATION PRODUCTS | 2012 |
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