FIELD: paper-and-pulp industry.
SUBSTANCE: cellulose delignification process comprises alkali treatment, delignification with hydrogen peroxide with sodium hydroxide and sodium silicate additive, and acid treatment. Alkali treatment consumes 0.5% hydrogen peroxide and 2.0% sodium hydroxide based on the weight of absolutely dry cellulose and is conducted for 2.0-2.5 h at 60-90°C. Acid treatment of delignified product is accomplished with aqueous hydrochloric acid, which is consumed in amount 1.0% based on the weight of absolutely dry fibers, while treatment is conducted for 30-60 min at ambient temperature.
EFFECT: enhanced economical efficiency without loss cellulose characteristics.
2 tbl, 11 ex
| Title | Year | Author | Number |
|---|---|---|---|
| BLEACHING PROCESS OF HARDWOOD SULPHATE PULP | 2013 |
|
RU2523118C1 |
| METHOD FOR BLEACHING OF HARDWOOD SULPHATE PULP | 2007 |
|
RU2347864C1 |
| METHOD OF BLEACHING SULPHATE PULP | 2010 |
|
RU2445415C1 |
| METHOD OF BLEACHING OF BISULFITE PULP | 2012 |
|
RU2503764C1 |
| METHOD OF BLEACHING HARDWOOD SULPHATE CELLULOSE | 2016 |
|
RU2634586C1 |
| PROCESS FOR WHITENING CONIFEROUS SULFATE CELLULOSE | 1992 |
|
RU2019612C1 |
| PROCESS FOR WHITENING DECIDUOUS SULFATE CELLULOSE | 1992 |
|
RU2019613C1 |
| METHOD FOR BLEACHING SULFITE PULP | 2021 |
|
RU2779395C1 |
| METHOD FOR MAKING CELLULOSE FOR CHEMICAL PROCESSING | 2022 |
|
RU2797173C1 |
| METHOD OF BLEACHED CELLULOSE PRODUCTION | 1993 |
|
RU2046869C1 |
