FIELD: paper-and-pulp industry.
SUBSTANCE: invention relates to production of fibrous intermediate products from annual plants, in particular from rice husks and/or rice straw. raw materials are first treated with NaOH solution, 20-60 g/L, at temperature not lower than 70°C for at least 20 min in order to remove silica. Resulting pulp is then washed to neutral reaction and then subjected to delignification process in ice acetic acid-hydrogen peroxide mixture in presence of sodium molybdate.
EFFECT: improved quality of cellulose material and extended resource of raw materials.
2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| CELLULOSE MANUFACTURING PROCESS | 2006 |
|
RU2321696C1 |
| METHOD FOR CELLULOSE PRODUCTION FROM RICE STRAW | 2010 |
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|
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| METHOD OF PRODUCING CELLULOSE FROM SUNFLOWER HUSKS | 2023 |
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| METHOD FOR PRODUCING OF CELLULOSE SEMI-FINISHED PRODUCT FROM LARCH WOOD | 2004 |
|
RU2251602C1 |
| METHOD OF PREPARING FIBROUS SEMIPRODUCT FOR PAPER PRODUCTION | 1993 |
|
RU2042004C1 |
| METHOD OF PREPARING CELLULOSE HALF-FINISHED PRODUCT | 2001 |
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| CELLULOSE PRODUCT WITH ALPHA-CELLULOSE CONTENT OF 98,5 % AND HIGHER AND INDUSTRIAL METHOD FOR PRODUCTION THEREOF | 2017 |
|
RU2703250C2 |
| METHOD OF CELLULOSE SEMI-FINISHED PRODUCT PRODUCTION | 2003 |
|
RU2217537C1 |
| METHOD FOR PRODUCING MICROCRYSTALLINE CELLULOSE FROM INDUSTRIAL HEMP TRUST | 2022 |
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RU2804999C1 |
