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A novel process for efficient utilization of bamboo fiber resource in dissolving pulp production by fiber
Yishan Liu1, Chenglong Fu2, Lianli Liu3
1Key Laboratory of Research and Evaluation of Bamboo Fiber Printing and Packaging Materials of China National Light Industry, Sichuan Technology & Business College, Dujiangyan, Sichuan Province 611830, China; Limerick Pulp and Paper Research and Education Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Sichuan Province Engineering Technology Research Center of Bamboo Pulping and Papermaking, Yibin, Sichuan Province 644100, China.
Abstract:
The rational use of bamboo to make dissolving pulp can offer up new opportunities for cellulose production, alleviating wood scarcity. Bamboo contains a high content of non-fiber cells, which presents technical challenges in dissolving pulp production by the conventional process. In this study, a process concept of separating hemicelluloses is presented by fiber fractionation and purification for cleaner production of bamboo dissolving pulp: bamboo kraft pulp was fractionated into long-fiber and short-fiber fractions. The cellulose-rich long-fiber fraction was converted to dissolving pulp by further purification treatment with acid hydrolysis and cold caustic extraction. The hemicellulose-rich short-fiber fraction was used for papermaking. The laboratory results were confirmed by those from mill trials. The combined pulp yield (dissolving pulp + paper-grade pulp) reached 49 %, which was significantly higher than that of the conventional pre-hydrolysis kraft pulping process. Furthermore, the quality of dissolving pulp was higher due to inherently higher cellulose content of long-fiber fraction.
