FIELD: paper-and-pulp industry.
SUBSTANCE: invention relates to manufacture of cellulose derivatives, in particular to a process of manufacturing microcrystalline cellulose, which can be used as filler in chemical-and-pharmaceutical industry, food processing industry, and as sorbent and filter material in technical areas, and as starting material for manufacture of low-viscosity cellulose derivatives. Pulp having whiteness up to 65% is subjected to two-step processing: hydrolysis of raw material in sulfuric acid and subsequent bleaching of hydrolyzed material with chlorine dioxide.
EFFECT: expanded technological possibilities.
8 ex
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| METHOD OF PRODUCING MICROCRYSTALLINE CELLULOSE | 1997 |
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RU2119986C1 |
| MICROCRYSTALLINE CELLULOSE PRODUCTION PROCESS | 2000 |
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RU2804640C2 |
| METHOD OF BLEACHING MATERIALS AND INTERMEDIATE PRODUCTS CONTAINING CELLULOSE | 2000 |
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| METHOD OF PRODUCING MICROCRYSTALLINE CELLULOSE | 1999 |
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| METHOD OF SULFATE CELLULOSE WHITENING | 1993 |
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| PROCESS FOR PRODUCING MICROCRYSTALLINE CELLULOSE | 2023 |
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RU2803626C1 |
| METHOD OF BLEACHING SULFATE CELLULOSE | 1998 |
|
RU2129179C1 |
| PROCESS FOR WHITENING CONIFEROUS SULFATE CELLULOSE | 1992 |
|
RU2019612C1 |
