漂白蔗渣浆中半纤维素含量对其TEMPO氧化性能的影响  

Effects of hemicellulose contents on TEMPO-oxidation performance of bleached bagasse pulp

作　　者：王霄 游欣 张夏明 梁辰[1,2] 王双飞 WANG Xiao;YOU Xin;ZHANG Xia-ming;LIANG Chen;WANG Shuang-fei(College of Light Industry and Food Engineering,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,Nanning 530004,China;State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广西大学轻工与食品工程学院,广西南宁530004 [2]广西清洁化制浆造纸与污染控制重点实验室,广西南宁530004 [3]华南理工大学制浆造纸国家重点实验室,广东广州510640

出　　处：《高校化学工程学报》2019年第1期152-158,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：广西清洁化制浆造纸与污染控制重点实验室主任基金(ZR201706)

摘　　要：以碱法提取半纤维素后的漂白蔗渣浆为原料,研究2,2,6,6-四甲基哌啶-1-氧自由基(TEMPO)氧化过程,探讨半纤维素含量对不同氧化程度漂白浆TEMPO氧化过程及氧化浆性能的影响。结果表明在氧化剂用量充足的情况下,减少纸浆中的半纤维素含量有利于加快氧化速率并延长氧化时间,从而促进羧基的生成,并且氧化程度越高促进作用越明显。半纤维素的存在一定程度上阻碍了氧化剂进入纤维内部,不利于TEMPO反应的进行。由于氧化降解反应,纸浆中半纤维素含量的减少以及氧化剂用量增加,会使氧化后浆料的聚合度和得率有所降低。Bleached bagasse pulp after hemicellulose-alkaline-extraction was used as the raw material to study its TEMPO(2,2,6,6-tetramethyl-1-piperidinyloxy)oxidation processes.Effects of hemicellulose contents on TEMPO oxidation of bleached pulp with different oxidation degrees and oxidized-pulp performance were investigated.The results show that decrease of hemicellulose content can accelerate oxidation and prolong the oxidation process when the oxidant is sufficient,which promotes the formation of carboxyl groups.Such effects were more obvious with higher oxidation degree of pulp.Hemicellulose obstructs the entering of oxidant into inner fiber,which is not available for the TEMPO reaction.Due to cellulose oxidative degradation,reduce of hemicellulose and increase of oxidant can decrease polymerization degree and oxidized-slurry yield.

关 键 词：半纤维素 TEMPO 氧化纤维素 漂白蔗渣浆 

分 类 号：TS7[轻工技术与工程—制浆造纸工程]