磺化桉木硫酸盐木质素的颜色降低
Color reduction of sulfonated eucalyptus kraft lignin.
作者信息
Zhang Hui, Bai Youcan, Zhou Wanpeng, Chen Fangeng
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
出版信息
Int J Biol Macromol. 2017 Apr;97:201-208. doi: 10.1016/j.ijbiomac.2017.01.031. Epub 2017 Jan 9.
Several eucalyptus lignins named as HSL, SML and BSL were prepared by high temperature sulfonation, sulfomethylation, butane sultone sulfonation respectively. The color properties of samples were investigated. Under optimized conditions the sulfonic group (SOH) content of HSL, SML and BSL reached 1.52, 1.60 and 1.58mmol/g, respectively. Samples were characterized by UV-vis spectroscopy, FTIR spectroscopy, H NMR spectroscopy, GPC and brightness test, respectively. The results revealed that BSL performed a higher molecular weight and lighter color due to the phenolic hydroxyl blocking by 1,4-butane sultone (1,4-BS). The color reduction of sodium borohydride treated BSL (labeled as SBSL) was further enhanced and the brightness value was improved by 76.1% compared with the darkest HSL. SBSL process was much better than HSL and SML process. Hydroxyl blocking effect of 1,4-BS and reducibility of sodium borohydride played important roles in the color reduction of sulfonated eucalyptus kraft lignin.
分别通过高温磺化、磺甲基化和丁烷磺内酯磺化制备了几种名为HSL、SML和BSL的桉木木质素。研究了样品的颜色特性。在优化条件下，HSL、SML和BSL的磺酸基（SOH）含量分别达到1.52、1.60和1.58mmol/g。分别通过紫外可见光谱、傅里叶变换红外光谱、核磁共振氢谱、凝胶渗透色谱和亮度测试对样品进行了表征。结果表明，由于1,4-丁烷磺内酯（1,4-BS）对酚羟基的封闭作用，BSL具有较高的分子量和较浅的颜色。硼氢化钠处理的BSL（标记为SBSL）的颜色降低进一步增强，与 darkest HSL相比，亮度值提高了76.1%。SBSL工艺比HSL和SML工艺要好得多。1,4-BS的羟基封闭作用和硼氢化钠的还原性在磺化桉木硫酸盐木质素的颜色降低中起重要作用。
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