木素H_2O_2漂白的浅色化效果  

Decolorization of Residual Lignin of Na_2SO_3 Treatment through H_2O_2 Bleaching

作　　者：李友明[1] 陈中豪[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室

出　　处：《中国造纸学报》1995年第1期27-32,共6页Transactions of China Pulp and Paper

基　　金：广东省科学基金

摘　　要：对经Ｎａ２ＳＯ３处理的不溶木素（ＵＴＬ）进行Ｈ２Ｏ２漂白，定量研究漂后不溶木素（ＵＢＴＬ）中色团含量及其浅色化行为发现：Ｈ２Ｏ２漂白一定程度地破坏了由Ｎａ２ＳＯ３处理引入的发色基团，但漂后色团含量仍高于未经Ｎａ２ＳＯ３处理的磨木木素；Ｈ２Ｏ２漂白木素的浅色化效果主要来源于邻醌结构的破坏，但残余邻醌仍为漂后木素颜色的主要来源；漂白前后邻酚含量基本保持不变，其铁螯合物存在于木素中，严重地降低了Ｈ２Ｏ２漂白对木素的浅色化效果；共轭羰基既不构成木素颜色的主要来源，对木素浅色化的贡献也不大。Residual lignin resulted from Na2SO3 treatment was bleached with H2O2. Decolorization of the residual lignin (UBTL) was studied quantitively. H2O2 bleaching destroyed some of the chromophores, but catechol content still remained intact. Decolorization of the lignin was mainly attibuted to the removal of Oquinone. If adequate amounts of metal ions are present in the system,chelating of catechols with the metalions may turn out to be the major cause of poor decololrization. O-quinone exerts strong chromophoric effect, any residual O-quinone in lignin could be another key factor for poor decolorization. Conjugated carbonyls play minor roles as far as the original lignin colour and the decolorization of the lignin are concerned.

关 键 词：H2O2漂白 木素 浅色 发色基团 来源 颜色 羰基 SO3 Na2S 酚含量 

分 类 号：TS745[轻工技术与工程—制浆造纸工程] TS193