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Upgrading Paper-grade Softwood Kraft Pulp to Dissolving Pulp by Cold Caustic Extraction
Authors:Chao Tian  QingXian Miao  LinQiang Zheng and YongHao Ni
Affiliation:1. China National Pulp and Paper Research Institute, Beijing, 100102, China;Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada;Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin,300457, China;2. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China;3. Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada;4. Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada;Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin,300457, China
Abstract:Cold caustic extraction has potential applications in the production of dissolving-grade pulps due to its ability to selectively remove hemicellulose from lignocellulosic materials.In this study,we demonstrate the conversion of paper-grade kraft pulp into dissolving pulp by a single-stage cold caustic extraction.Under the extraction conditions of 12 wt% NaOH lye,11% pulp consistency,a temperature of 35℃,and 2 h,a paper-grade softwood kraft pulp was purified to high-grade dissolving pulp with 97.1% α-cellulose content,1.2% pentosane content,and narrowed molecular weight distribution.The resulting extraction filtrate was concentrated by nano-filtration to obtain the hemicellulose content of 59.0 g/L,while the permeate was a clear NaOH solution with 10.9 wt% concentration.A process configuration was also proposed,integrating this cold caustic extraction process with existing pulp and paper production and multi-purpose utilization of the extraction filtrate.
Keywords:cold caustic extraction  dissolving pulp  α-cellulose  membrane filtration  hemicellulose
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