不同来源木质素磺酸钠的结构特征及用作水煤浆分散剂

Molecular structure of sodium lignosulphonate from different materials and their properties as dispersant of coal water slurry

引言木质素磺酸盐分子中含有苯丙烷基（C6-C3）疏水骨架和磺酸基为主要亲水基团,是具有阴离子表面活性剂结构特征的高分子化合物,来源于亚硫酸法生产纸浆或纤维浆的副产物,具有吸附分散性,广泛应用于染料、涂料、石油、煤炭工业和建筑业等领域.

Infra-red spectrum and ultraviolet absorption spectrum were used to study the structure characteristics of the sodium lignosulphonate from black liquor of poplar tree, straw, bamboo and bagasse. Gel chromatography analysis showed that the weight average molecular mass of poplar and bamboo lignosulphonates were 5306 and 5520 respectively, higher than those of straw and bagasse lignosulphonates, which were 2594 and 3596 respectively. Chemical titration measurements showed that the sulfonic group content of poplar lignosulphonate was 1.15 mmol·g^-1, which was lower than that of straw and bamboo lignosulphonates, but higher than that of bagasse lignosulphonate, and the phenolic hydroxyl group content of poplar lignosulphonate was 1.01 mmol·g^-1, which was higher than that of other three lignosulphonates. The four sodium lignosulphonates were used as additives of coal water slurry and the effect of the structure characteristics of different lignosulphonates on the viscosity reduction of coal water slurry was investigated. The results showed that the raw material of lignosulphonate, relative molecular weight distribution and sulfonic group content were the main affecting factors.