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Regulation of Superoxide Anion Radical During the oxygen delignification Process

Chinese Journal of Chemical Engineering 2007年第1期15卷 132-137页

作者：曹石林詹怀宇付时雨陈礼辉 State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510641 China Ihnisntait ute of Material Engineering Fujian Agriculture and Forestry University Fuzhou 350002 China State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510641 China Institute of Material Engineering Fujian Agriculture and Forestry University Fuzhou 350002 China

In this study, the superoxide anion radicals were generated by the auto-oxidation of 1,2,3-trihydroxybenzene and determined by UV spectrophotometry, and the reaction was found to be facilitated by anthraquinone-2-sulfonic acid sodium salt. The bamboo kraft pulps were treated by the 1,2,3-trihydroxybenzene auto-oxidation method or the 1,2,3-trihydroxybenzene auto-oxidation combined with anthraquinone-2-sulfonic acid sodium salt to show the ef-fect of the superoxide anion radicals during the oxygen delignification of bamboo kraft pulp and the enhancing af-fect of anthraquinone compounds as an additive on delignification. The results indicated that the superoxide anion radicals could react with lignin and remove it from pulp with negligible damage on cellulose, and the an-thraquinone-2-sulfonic acid sodium salt could facilitate the generation of superoxide anion radical to enhance delig-nification of pulps. The oxygen delignification selectivity could be improved using the 1,2,3-trihydroxybenzene auto-oxidation system combined with anthraquinone-2-sulfonic acid sodium salt.

关键词： superoxide anion radical anthraquinone-2-sulfonic acid sodium salt oxygen delignification selectivity

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Sulfite-Formaldehyde Pulping and oxygen delignification of Wheat Straw

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Paper And Biomaterials 2017年第3期2卷 12-17页

作者： WenJuan Wu Yu Zhang Bo Jiang YongCan Jin Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry University State Key Laboratory of Pulp and Paper Engineering South China University of Technology

In this study,wheat straw pulp was prepared by sulfiteformaldehyde(SF) pulping combined with oxygen delignification to develop a sustainable methodology for chemical pulping of straw *** bleachability of oxygen-delignified SF pulp was also evaluated by hypochlorite *** results indicated that the Na_2SO_3 charge played an important role in lignin removal during SF pulping as well as oxygen *** efficiency of oxygen delignification of wheat straw SF pulp was markedly *** the oxygenation stage,the Kappa number decreased by over 50%(the original Kappa number of SF pulp was lower than 30) when the Na OH 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 Na_2SO_3 and 3% of Na OH,*** 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.

关键词： sulfite-formaldehyde pulping oxygen delignification Kappa number wheat straw

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APPLICATION OF AQ IN oxygen delignification OF WHEAT STRAW SODA PULP

APPLICATION OF AQ IN OXYGEN DELIGNIFICATION OF WHEAT STRAW S...

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第十六届木材、纤维及制浆化学国际会议

作者： Zhulan Liu,Shuangshuang Chen,Yunfeng Cao~* Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology,Nanjing Forest University,Nanjing 210037, China.

oxygen delignification of wheat straw soda pulp with AQ addition was *** a L（3～4） orthogonal test,the effects of alkali charge,oxygen pressure, maximum cooking temperature and holding time at the maximum temperature were *** optimal conditions were as follows:alkali charge on oven dry pulp（as NaOH） was 3%,with oxygen pressure of 0.5MPa, maximum temperature of 120℃and holding time at the maximum temperature of *** with the corresponding conventional oxygen delignification of wheat straw soda pulp,the oxygen delignification with AQ addition produced pulp with very close kappa number but higher yield,and its viscosity and brightness were remained in high level.

关键词： wheat Straw soda pulp oxygen delignification AQ

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