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 |
|
RU2479568C1 |
| METHOD OF SULPHIDE STOCK CONTAINING NOBLE METALS | 2012 |
|
RU2528300C2 |
| METHOD OF PREPARING DIGESTION FLUID FOR MAKING FIBROUS SEMIFINISHED PRODUCT | 0 |
|
SU1097740A1 |
| 0 |
|
SU439970A1 | |
| METHOD OF PRODUCING CELLULOSE FOR CHEMICAL PROCESSING | 2020 |
|
RU2738813C1 |
| METHOD FOR OBTAINING CELLULOSE FOR CHEMICAL PROCESSING FROM CELLULOSE-CONTAINING RAW MATERIALS | 2020 |
|
RU2763878C1 |
| METHOD FOR INTEGRATED PRODUCTION OF CELLULOSE AND REUSABLE LOW-MOLECULAR WEIGHT MATERIALS | 2009 |
|
RU2535222C2 |
| METHOD OF PREPARING SODIUM PYROSULFITE | 1999 |
|
RU2159737C1 |
| 0 |
|
SU13944A1 | |
| OIL AND GAS CONDENSATE TREATMENT METHOD | 2013 |
|
RU2541523C2 |
