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Sulfite-Formaldehyde Pulping and Oxygen Delignification of Wheat Straw

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Author Name	Affiliation
WenJuan Wu^1,2,/sup>	1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037, China 2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640, China
Yu Zhang¹	1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037, China
Bo Jiang¹	1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037, China
YongCan Jin^1,*	1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037, China

Fund Project:The authors are grateful for financial support from the China Postdoctoral Science Foundation (Grant No.2016M591853), the Foundation of the State Key Laboratory of Pulp and Paper Engineering, China (Grant No. 201616), the Youth Science and Technology Innovation Fund of Nanjing Forestry University, China (CX2015015), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

Abstract:In this study, wheat straw pulp was prepared by sulfite-formaldehyde (SF) pulping combined with oxygen delignification to develop a sustainable methodology for chemical pulping of straw materials. The bleachability of oxygen-delignified SF pulp was also evaluated by hypochlorite bleaching. The results indicated that the Na₂SO,sub>3 charge played an important role in lignin removal during SF pulping as well as oxygen delignification. The efficiency of oxygen delignification of wheat straw SF pulp was markedly high. After the oxygenation stage, the Kappa number decreased by over 50% (the original Kappa number of SF pulp was lower than 30) when the NaOH charge was in the range of 3%~5%. The optimal conditions for preparing bleached pulp via combined SF pulping and oxygen delignification involved the use of 12% of Na₂SO,sub>3 and 3% of NaOH, respectively. Pulp with relatively high brightness, a low Kappa number, as well as an acceptable viscosity could be obtained when oxygen-delignified SF pulp was bleached with hypochlorite under a low active chlorine dosage.

keywords:sulfite-formaldehyde pulping oxygen delignification Kappa number wheat straw

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