文献类型：期刊文献

中文题名：木质素样品的羟值测定方法

英文题名：The Improvement in the Determination Method of Hydroxyl Value for Lignin

作者：孙戈亮[1] 万平玉[1] 赵磊[1] 陈咏梅[1] 李改云[2] 秦特夫[2]

第一作者：孙戈亮

机构：[1]北京化工大学理学院;[2]中国林业科学研究院木材工业研究所

年份：2012

卷号：32

期号：3

起止页码：51-55

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD_E2011_2012】；

基金：国家863计划(2010AA101703);北京市分析测试方法创新实验室建设项目资助(PXM2010-178305-094359)

语种：中文

中文关键词：木质素;羟值;酸值;碱值

外文关键词：lignin ; hydroxyl value ; acid value; base value

分类号：TQ351;O652.3

摘要：以聚醚多元醇羟值测定方法——邻苯二甲酸酐-吡啶法为基础建立了木质素样品中活性羟基官能团数目测定方法,针对木质素磺酸钠和玉米秸秆酶解木质素样品的特性,改进了羟值校正时酸值和碱值的测定方法:在确保酸值测定精确度的同时成功采用乙醇-水替代了高毒性吡啶溶剂,在碱值测定时率先采用邻苯二甲酸氢钾替代盐酸溶液,使测定碱值的相对标准偏差小于1%,精确度得以显著提高。
Hydroxyl value of lignin was determined by the phthalic anhydride - pyridine method which is the standard method for determination of hydroxyl value for polyether glycol. The accuracy of hydroxyl value via acid value and base value measurement was improved, while this novel method employed for sodium ligninsulfonate and enzymatic hydrolysis lignin from cornstalks. Re- placing pyridine with ethanol as solvent and HCl with potassium hydrogen phthalate for measuring base value, enhanced the accu- racy and precision of the measured results. The deviation of base value is less 1%. In addition, the cost of determination de- creased, compared with the traditional method.