乙醇-水介质改善竹材化机浆H_2O_2漂白性能
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摘要
采用乙醇-水溶液作为过氧化氢(H_2O_2)漂白过程中的介质,以提高H_2O_2漂白效率、突破水介质漂白竹材化机浆时的白度增限(白度71%)。结果表明,水介质漂白时,H_2O_2用量15%时仅能将竹浆漂白至69. 2%的白度,乙醇-水介质(乙醇质量分数50%)漂白仅需用量9%的H_2O_2即可达到相同白度,节省H_2O_2用量40%;随着H_2O_2用量的增加,乙醇-水介质漂白浆与水介质漂白浆的白度差值随之增加; H_2O_2用量15%时,白度为77. 4%,比水介质漂白浆白度增加8. 2个百分点;H_2O_2用量25%时,白度为81. 7%,比水介质漂白浆白度增加10. 3个百分点。紫外可见光吸收光谱(UV-Vis)分析显示,达到同一白度目标值时,乙醇-水介质H_2O_2漂白时,H_2O_2对木素发色结构中370～385 nm处与苯环共轭的α-羰基结构、苯环连接的γ-醛基结构以及400～500 nm处醌型结构破坏作用加强,纸浆的漂白稳定性好。
To improve hydrogen peroxide bleaching efficiency and break"brightness ceiling"of bamboo chemi-mechanical pulp( CMP),tests of an improved hydrogen peroxide bleaching procedure for bamboo chemi-mechanical pulps were performed with inclusion of ethanol in the bleaching medium( IEBM). Compared with a conventional bleaching method,the CMP was bleached to brightness of 69. 2% when the dosage of H_2O_2 was 15%,with the IEBM method the CMP was bleached to the same brightness when the H_2O_2 dosage was 9%,bleaching with the IEBM method reduced H_2O_2 consumption by approximately 40%. At the usage level of 15% H_2O_2,the CMP could be bleached to the brightness of 77. 4% with the IEBM method,increased by 8. 2 percentage points compared with the conventional method. Further more,the bleached brightness differences between IEBM and conventional method increased dosage level of H_2O_2 increased,it could reach up to 10. 3 percentage points,when the CMP was bleached to the brightness of 81. 7% at the dosage of 25% H_2O_2 increased. UV-Vis spectrophotometry showed that,for the same brightness,bleached pulps with IEBM method had better bleaching stability than the bleached pulps of conventional method,the main reason was the improved destruction of chromatic structures of the α-carbonyl group conjugated with benzene ring and γ-aldehyde group connected with benzene ring that absorb light in the region of 370 ～ 385 nm,and also the improved destruction of quinoid structure that absorb light in the region of 400 ～ 500 nm.
To improve hydrogen peroxide bleaching efficiency and break"brightness ceiling"of bamboo chemi-mechanical pulp( CMP),tests of an improved hydrogen peroxide bleaching procedure for bamboo chemi-mechanical pulps were performed with inclusion of ethanol in the bleaching medium( IEBM). Compared with a conventional bleaching method,the CMP was bleached to brightness of 69. 2% when the dosage of H_2O_2 was 15%,with the IEBM method the CMP was bleached to the same brightness when the H_2O_2 dosage was 9%,bleaching with the IEBM method reduced H_2O_2 consumption by approximately 40%. At the usage level of 15% H_2O_2,the CMP could be bleached to the brightness of 77. 4% with the IEBM method,increased by 8. 2 percentage points compared with the conventional method. Further more,the bleached brightness differences between IEBM and conventional method increased dosage level of H_2O_2 increased,it could reach up to 10. 3 percentage points,when the CMP was bleached to the brightness of 81. 7% at the dosage of 25% H_2O_2 increased. UV-Vis spectrophotometry showed that,for the same brightness,bleached pulps with IEBM method had better bleaching stability than the bleached pulps of conventional method,the main reason was the improved destruction of chromatic structures of the α-carbonyl group conjugated with benzene ring and γ-aldehyde group connected with benzene ring that absorb light in the region of 370 ～ 385 nm,and also the improved destruction of quinoid structure that absorb light in the region of 400 ～ 500 nm.
引文
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[22]Fang Guigan.Light-induced yellowing mechanical of poplar APMP pulps and Its’inhibition measures[D].Beijing:Institute of Chemistry Industry of Forest Products Chinese Academy of Forestry,2002.房桂干.杨木APMP纸浆光诱导返色机理及抑制技术研究[D].北京:中国林业科学研究院,2002.
[23]Li Xinping,Wu Sheng.Preliminary study on the reaction of diosane lignin andβ-O-4 type lignin ortho-quinone model compound with hydrogen peroxide[J].Journal of Shanxi University of Science and Technology,2006,24(6):6.李新平,伍胜.木素及β-O-4型邻醌木素模型物与过氧化氢反应的初步研究[J].陕西科技大学学报,2006,24(6):6.
[24]Qian Xueren,An Xianhui.Green bleaching technologies of pulp[M].Beijing:Chemical Industry Press,2008.钱学仁,安显慧.纸浆绿色漂白技术[M].北京:化学工业出版社,2008.
[2]HAN Ying,ZAI Huamin.Research Progress of Alkaline Hydrogen Peroxide Bleaching of Mechanical Pulp[J].China Pulp&Paper,2008,27(1):50.韩颖,翟华敏.机械浆碱性过氧化氢漂白的研究进展[J].中国造纸,2008,27(1):50.
[3]SHEN Kuizhong,FANG Guigan,HU Jianmin,et al.Bleaching of High Yield Pulps From a Bamboo Species Neosinocalamus Affins(Rendle)Keng F[J].China Pulp&Paper,2010,29(3):1.沈葵忠,房桂干,胡剑民,等.慈竹化机浆漂白性能的研究[J].中国造纸,2010,29(3):1.
[4]Zhan Huaiyu,Chen Jiaxiang.Pulping principle and engineering[M].3rd.Beijing:Chemical Industry Press,2014.詹怀宇,陈嘉翔.制浆原理与工程[M].3版.北京:中国轻工业出版社,2014.
[5]Liu Shijie.Chemical kinetics of alkaline peroxide brightening ofmechanical pulps[J].Chemical Engineering Science,2003,58:2229.
[6]Bajpai P.Environmentally benign approaches for pulp bleaching[M].Netherlands:Elsevier Science Ltd.,2012.
[7]Wong D F,Schmidt J A,Heitner C.Magnesium-based alkalis for hydrogen peroxide bleaching of mechanical pulps[J].Pulp&Paper Canada,2006,107(12):68.
[8]Kong F G,Ni Y H,He Z B.A partial magnesium hydroxide substitution for sodium hydroxide inperoxide bleaching of an aspen CTMP[J].Journal of Wood Chemistry and Technology,2009,29(2):136.
[9]Sain M M,Daneault C,Parenteau M.Bleach activation of thermomechanical pulp[J].Canadian Journal of Chemical Engineering,1997,75(1):62.
[10]Wong D F,Leary G,Arct G.The role of stilbenes in bleaching and colour stability of mechanical pulps.I.The reaction of lignin model stilbenes with alkali and oxygen[J].Research on Chemical Intermediates,1995,21(35):329.
[11]LI Bingyun,ZHAN Huaiyu,LIANG Chen,et al.Effect of Enzyme Pretreatment on the Properties of Bamboo(Bambusa Chung II)SCMPbleached by H2O2[J].Transactions of China Pulp and Paper,2010,25(1):9.李兵云,詹怀宇,梁辰,等.酶处理对粉单竹SCMP过氧化氢漂白浆性质的影响[J].中国造纸学报,2010,25(1):9.
[12]Pan G X.Improving hydrogen peroxide bleaching of aspen CTMP by using aqueous alcohol media[J].BioResources,2011,6(4):4005.
[13]Pan G X.Pulp yield loss in alkaline peroxide bleaching of aspen CT-MP.Part 1:Estimation and impacts[J].Tappi Journal,2002,2(9):27.
[14]He Z,Ni Y H.Peroxide bleaching of eucalyptus CTMP using magnesium hydroxide as the alkali source[J].Appita Journal,2008,61(6):450.
[15]Hou Q X,Yuan W,Zhang S Y,et al.Partially substituting Mg O for NaOH as the alkali source in the second-stage impregnation of triploid poplar P-RC APMP[J].Industrial&Engineering Chemistry Research,2010,49(7):3088.
[16]Suess H U,Del G M,Schmidt k,et al.Options for bleaching mechanical pulp with a lower COD[J].Appita Journal,2002,55(4):276.
[17]XU Ningpan,LIU Wei,HOU Qingxi,et al.Effect of Partially Substituting Mg O for NaOH on the Properties of DCS and Pulp in the Peroxide Bleaching of Poplar CTMP[J].China Pulp&Paper,2015,34(7):6.徐宁攀,刘苇,侯庆喜,等.Mg O部分替代NaOH对杨木CT-MP过氧化氢漂白的影响[J].中国造纸,2015,34(7):6.
[18]CHI Congcong,ZHANG Zeng,HUANG Ganqiang.Replacement of Sodium-based Peroxide Bleaching by Magnesium-based Peroxide Bleaching for High Yield Pulp[J].China Pulp&Paper,2006,25(10):47.迟聪聪,张曾,黄干强.用镁碱代替钠碱的高得率浆过氧氢漂白[J].中国造纸,2006,25(10):47.
[19]Zawadzki M A.Quantitative determination of quinone chromophre changes during ECF bleaching Georgia Institnte of Technology of kraft pulp[D].Atalanta:1999.
[20]Liang Fangmin.Pulping Technology and Bleaching Mechanism of Neosinocalamus affins Chemimechanical Pulps[D].Beijing:Chinese Academy of Forestry,2011.梁芳敏.慈竹化机浆工艺技术及漂白机理的研究[D].北京:中国林业科学研究院,2011.
[21]Liang C,Zhan H Y,Li B Y,et al.Extractives of high-yield bamboo pulp and their effects on H2O2bleaching[J].Journal of South China University of Technology(Natural Science Edition),2010,38(9):46.梁辰,詹怀宇,李兵云,等.高得率竹浆抽出物及其对H2O2漂白的影响[J].华南理工大学学报(自然科学版),2010,38(9):46.
[22]Fang Guigan.Light-induced yellowing mechanical of poplar APMP pulps and Its’inhibition measures[D].Beijing:Institute of Chemistry Industry of Forest Products Chinese Academy of Forestry,2002.房桂干.杨木APMP纸浆光诱导返色机理及抑制技术研究[D].北京:中国林业科学研究院,2002.
[23]Li Xinping,Wu Sheng.Preliminary study on the reaction of diosane lignin andβ-O-4 type lignin ortho-quinone model compound with hydrogen peroxide[J].Journal of Shanxi University of Science and Technology,2006,24(6):6.李新平,伍胜.木素及β-O-4型邻醌木素模型物与过氧化氢反应的初步研究[J].陕西科技大学学报,2006,24(6):6.
[24]Qian Xueren,An Xianhui.Green bleaching technologies of pulp[M].Beijing:Chemical Industry Press,2008.钱学仁,安显慧.纸浆绿色漂白技术[M].北京:化学工业出版社,2008.