Iranian Journal of Wood and Paper Industries

Iranian Journal of Wood and Paper Industries

Investigation of the feasibility of utilizing wood chipper fines for the production of bleached cellulosic pulps (case study: Mazandaran wood and paper industries)

Document Type : Research Paper

Authors
1 Ph.D. Student, Dept. of Paper Sciences and Engineering, Faculty of Wood and Paper Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
2 Prof, Pulp and Paper Department, Faculty of Wood and Paper Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
3 Gorgan University of Agricultural Science and Natural Resources
4 استادیار و کرسی تحقیقات پالایش زیستی در توسعه مواد لیگنوسلولزی، دانشکده مدیریت منابع طبیعی، دانشگاه Lakehead ، انتاریو، کانادا
Abstract
Background and objectives: The scarcity of cellulose fiber resources in the country, coupled with stringent forest protection laws and environmental regulations governing the import of raw wood has presented a shortcoming for wood fiber factories in securing cellulose starting materials. Consequently, these companies are actively exploring alternative sources with optimal efficiency. This research is aimed at investigating the feasibility of wood chipper fines for the production of bleached cellulosic pulps.
Materials and methods: To achive this objective, chipper fines were obtained from of Mazandaran Wood and Paper Industries and subjected to soda-anthraquinone pulping process following bleaching with D0ED1P and HEP bleaching sequences. Three pulping variables were considered: active alkalinity (levels: 14, 16, 18 and 20%), cooking time at maximum temperature (levels: 60, 90 and 120 minutes) and the ratio of liquor to the dry weight of the wood fines (two levels: 5 and 6 to1). The pulping process maintained aconstant temperature of 165 degrees Celsius, with a consistent0.2% of anthraquinone. A factorial test design (randomized complete blocks) was employed to analyse pulping variables’s impact on yield, kappa number, and viscosity of bleached cellulose pulps. Additionally, each bleaching sequence’s effects on lignin percentage, yield, viscosity, degree of polymerization, and molecular weight of cellulose pulp were determined.
Results The finding revealed that with intensifying cooking conditions led to a decrease in kappa number, yield,and viscosity. The influence of active alkali on these properties was more significant than the other two variables, confirming the percentage of active alkali, cooking time, and the ratio of liquor to dry weight of wood fines being the most effective factors, respectively. Optimal cooking conditions (yield: 49.5%; Kappa number: 49.45 and viscosity: 1096 ml/g) were identified at 20% active alkali, 120 minutes cooking time , and a 6:1 ratio of liquor to dry weight of wood fines.
Keywords

Subjects


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