FIELD: chemistry.
SUBSTANCE: method for organosolvent lignins sulfation is implemented by reacting lignins with a sulfating complex in a solvent at continuous stirring and heating, followed by isolation of the desired product. As the sulfating agent, a sulfamic acid-urea complex is used, prepared by mixing equimolar amounts of reagents in dioxane at a temperature of 80-95°C, hydromodule 1:5, for 2.5-3.5 hours, at a ratio of the lignin amounts to the sulfating complex of 1:6-8 (g:mmol). The product is isolated by solvent neutralisation and decantation, then purified from low molecular weight impurities by dialysis.
EFFECT: invention allows to simplify the method, increase its environmental friendliness, and expand the range of sulphate reagents for lignin.
1 tbl, 8 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF SULPHATING ORGANOSOLVENT LIGNIN | 2019 |
|
RU2702582C1 |
| METHOD OF SULPHATION ORGANOSOLVENT LIGNIN | 2018 |
|
RU2665576C1 |
| METHOD FOR SULPHATING LARCH WOOD ARABINOGALACTAN WITH SULFAMIC ACID | 2021 |
|
RU2760432C1 |
| METHOD OF PRODUCING SULPHATED ARABINOGALACTAN DERIVATIVES | 2013 |
|
RU2521649C1 |
| METHOD FOR SULFATION OF GALACTOGLUCOMANNAN IN PINE WOOD WITH SULFAMIC ACID | 2022 |
|
RU2787219C1 |
| METHOD OF OBTAINING SULPHATED DERIVATIVES OF ARABINOGALACTAN | 2014 |
|
RU2546965C1 |
| SULFATING OF BIRCH WOOD XYLAN WITH SULFAMIC ACID | 2020 |
|
RU2757259C1 |
| METHOD OF SULFATE OF XILANE WOOD OF BIRCH WITH SULFAMIC ACID | 2016 |
|
RU2620597C1 |
| METHOD OF PRODUCING BETULIN 3-PROPIONATE-28-SULPHATE DERIVATIVES | 2015 |
|
RU2568643C1 |
| METHOD FOR PRODUCING BETULIN 3-ACETATE-28-SULPHATE DERIVATIVES | 2014 |
|
RU2560710C1 |
