1. Combination of mechanical, alkaline and enzymatic treatments to upgrade paper-grade pulp to dissolving pulp with high reactivity.
- Author
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Duan C, Verma SK, Li J, Ma X, and Ni Y
- Subjects
- Alkalies chemistry, Carbohydrates chemistry, Cold Temperature, Endopeptidases chemistry, Esterases chemistry, Industrial Waste, Molecular Weight, Refuse Disposal methods, Sodium Hydroxide chemistry, Stress, Mechanical, Viscosity, Water chemistry, Cellulase chemistry, Enzymes chemistry, Paper, Polysaccharides chemistry, Wood
- Abstract
A modified process consisting of an initial mechanical refining (R) followed by a low-alkali (5.5% NaOH) cold caustic extraction (CCE) and finally an endoglucanase (EG) treatment (R-5.5%CCE-EG) was investigated for upgrading paper-grade pulp to dissolving pulp. Results showed that compared to the conventional process (9%CCE-EG), the modified process can decrease the alkali concentration (from 9% to 5.5%) to achieve a similar hemicelluloses removal while simultaneously enhancing the Fock reactivity (from 62.2% to 81.0%). The improved results were due to the fact that the mechanical refining resulted in favorable fiber morphological changes, including increased pore volume/size, water retention value and specific surface area. Consequently, the hemicelluloses removal was enhanced even under the subsequent low-alkali CCE condition. A synergic effect of refining, low alkali concentration and enzymatic activation was responsible for the higher reactivity of resulting dissolving pulp., (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Published
- 2016
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