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Cellulase treatment is a promising technology that will increase the reactivity of a prehydrolysis kraft (PHK) dissolving pulp. In this study, a cellulase solution was sprayed onto rewetted pulp at a very high consistency (about 60%) to increase its Fock reactivity with high efficiency and low cost. This novel and facile approach is based on favorable cellulose adsorption onto pulp fibers and high...
Cellulose is a green and sustainable feedstock that can be used for manufacturing many bio-based products. Dissolving pulps, the main source of high-purity cellulose, have been extensively used in the production of cellulose-based products. The reactivity of dissolving pulp is a critical property because a high reactivity can decrease the production cost and environmental impact of application processes,...
Cellulase treatment for decreasing viscosity of cellulose (dissolving pulp) is a promising approach to reduce the use of toxic chemicals, such as hypochlorite in the dissolving pulp manufacturing process. In this study, the use of an endoglucanase-rich cellulase to replace the hypochlorite for this purpose and its improvements of the Fock reactivity were investigated. The results showed that at a...
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...
The processability and quality of viscose are mainly influenced by the properties of dissolving pulps. Acid sulfite (AS) and prehydrolysis kraft (PHK) are the main commercial processes for the production of dissolving pulps. In this paper, the properties of dissolving pulps obtained from the AS and PHK processes, with respect to purity, molecular weight distribution (MWD), porosity, surface area,...
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