Preparation and evaluation of lignosulfonates as a dispersant for gypsum paste from acid hydrolysis lignin
Preparation and evaluation of lignosulfonates as a dispersant for gypsum paste from acid hydrolysis lignin
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DOI：
10.1016/j.biortech.2004.05.023
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发表时间：
2005-03-01
影响因子：
11.4
通讯作者：
Yasuda, S
中科院分区：
文献类型：
--
作者：
Matsushita, Y;Yasuda, S
为了有效利用木质原料酸解糖化过程中的副产物愈创木基硫酸木质素（SAL），研究了其化学转化为水溶性、高分散性磺化产物的方法。首先，SAL被酚化（P-SAL）以提高溶解性和反应性。以P-SAL为原料，通过羟甲基化、中性磺化（两步法）、磺甲基化（一步法）和芳基磺化三种方法合成了乳酸酯磺酸盐。令人惊讶的是，所有制备的木质素磺酸盐具有比商业木质素磺酸盐高30至70%的石膏糊的粘度。石膏膏制剂的评价表明，较高的分子量和硫含量的制剂增加了它们的结晶度。(C)2004爱思唯尔有限公司保留所有权利。
In order to effectively utilize a by-product of the acid saccharification process of woody materials, the chemical conversion of guaiacyl sulfuric acid lignin (SAL), one of the acid hydrolysis lignins, into water-soluble sulfonated products with high dispersibitity was investigated. At first, SAL was phenolated (P-SAL) to enhance the solubility and reactivity. Lignosuffortates were prepared from P-SAL by three methods of hydroxymethylation followed by neutral sulfonation (two-step method), sulfomethylation (one-step method) and arylsulfonation. Surprisingly, all prepared lignosulfonates possessed 30 to 70% higher dispersibility for gypsum paste than the commercial lignosulfonate. Evaluation of the preparations for gypsum paste suggested that the higher molecular weights and sulfur contents of the preparations increased their dispersibility. (C) 2004 Elsevier Ltd. All rights reserved.