Modification of Spruce Sulphite Pulp by Cellulase Treatment
نویسنده
چکیده
Enzymatic treatment of different sulphite pulps with cellulases has been studied in this work. Endoglucanases were shown to beneficially alter the properties of both paper-grade and dissolving-grade pulps. In the case of the paper-grade pulp, the treatment with endoglucanase resulted in a considerable reduction of the pulp refining time without decrease in strength properties. While for the dissolving pulp, a viscosity decrease was achieved by cellulase treatments, which might be useful in upgrading pulp bleaching processes. The structure and composition diversity of sulphite and kraft pulps was found to define different employment of cellulases for their treatment.
منابع مشابه
Cellulase Production by Trichoderma reesei using Sugar Beet Pulp
Cellulase production by the fungus Trichoderma reesei was studied using sugar beet pulp (SBP) as a substrate. The subculture medium was a salt solution consisting of KH2PO4, CaCl2, etc. Fungal cells were sub-cultured in an orbital shaker (180 rpm) at 30°C for 1-2 generations (two days for each generation) and were then used as an inoculum. Exponential cells were inoculated into a medium contain...
متن کاملThesis for the degree of LOW CONSISTENCY REFINING PROCESS CONDITIONS A Mid Sweden University, SE Mid Sweden University Licentiate of Technology, Sundsvall 20 OF MECHANICAL PULP ND ENERGY EFFICIENCY
The thesis is focussed on low consistency (LC) refining of mechanical pulp. The research included evaluations of energy efficiency, development of pulp properties, the influence of fibre concentration on LC refining and effects of rotor position in a two-zoned LC refiner. Trials were made in mill scale in a modern TMP line equipped with an MSD Impressafiner for chip pre-treatment, double disc (...
متن کاملThe Beatability-aiding Effect of Aspergillus niger Crude Cellulase on Bleached Simao Pine Kraft Pulp and its Mechanism of Action
Bleached simao pine kraft pulp was treated with Aspergillus niger crude cellulase produced by submerged fermentation using the pulp as the carbon source. The effects of the cellulase on the pulp beatability and mechanical properties were studied. Fourier transform infrared spectroscopy (FT-IR) was performed to study the effect of cellulase treatment on the cellulose crystallinity index. The fib...
متن کاملManufacturing Paper Sheets from Olive Wood by Soda, Sulphite and Kraft Pulping
Paper sheets from Iranian olive tree produced by soda, sulphite and kraft pulping.Then the influence of pulp beating on properties of paper sheets was studied. Kraft pulp exhibited the highest holocellulose/yield -cellulose/yield ratios and the sulphite pulp the soda pulp the highest lignin/yield ratio. Paper sheets from kraft with the breaking length 5851 m, stretch 4.61%, Burst index 4.48 KN/...
متن کاملDeresination Options in Sulphite Pulping
Three methods for improved deresination of sulphite pulps were evaluated, namely, alkaline washing, enzyme treatment, and pulp fractionation. Alkaline washing appears to come at a high cost, because caustic is expensive and affects cellulose chain length, as indicated by lower viscosity of the pulps. Thus this is not a viable option for pulps that are sensitive to changes in viscosity. Enzyme t...
متن کامل