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Hemicellulose separation/removal from cellulosic fibers is critical for manufacturing high-purity cellulose (dissolving pulp). In this communication, a combined system of using both urea and NaOH was studied to enhance the separation/removal of hemicellulose from a softwood sulfite dissolving pulp. The urea/NaOH treatment significantly improves the hemicellulose removal. With a 1% urea concentration...
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-based material for novel and functional application, has attracted more attention, due to its degradable, renewable and green nature. In this research, a conductive regenerated cellulose film (CRCF) was developed as an effective counter electrode (CE) for preparing dye-sensitized solar cells (DSSCs). The CRCF presented desirable surface morphologies and structure and low resistance, and...
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...
Enhancing removal of hemicelluloses from cellulosic fibers is of decisive importance for producing high-purity cellulose. In this study, poly(ethylene glycol) (PEG) was added to a cold caustic extraction (CCE) process to promote removal of hemicelluloses from a softwood sulfite dissolving pulp. The content of hemicelluloses was considerably decreased from 11.4 % in the original sample to 5.3 % in...
This study was to determine the effect of fiber hornification on the viscosity decrease of prehydrolysis kraft-based dissolving pulp using a commercial endoglucanase-rich cellulase. Three pulp samples, namely never-dried (ND), air-dried (AD) and oven-dried (OD), were used. The results showed that the enzymatic performance in the viscosity decrease was affected by the fiber history: the ND sample showed...
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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