马来海松酸醇酰胺的合成及其对神华煤的分散作用

Synthesis of Coal-water Slurry Dispersant Based on Maleopimaric Acid Diethanolamine and Its Dispersive Action on Shenhua Coal

以松香为原料,与顺丁烯二酸酐加成,经二乙醇胺改性得到马来海松酸醇酰胺分散剂。考察了神华煤水煤浆的不同质量分数、分散剂添加量、转速、温度、pH等条件下的流变行为和Zeta电位,以及接触角和储存72 h过程中的析水率。得出煤质量分数64%,分散剂质量分数0.2%的水煤浆在100 s-1下的表观黏度为896.5 mPa.s,析水率3.2%,Zeta电位-23.5 mV,并且高温和碱性环境有利于水煤浆的成浆性。初步探讨了分散剂的结构与煤粒的作用方式,认为分散剂通过多元碳环与煤表面相连,醇酰胺链段与水形成氢键,并提供了一定的空间位阻,阻隔了煤粒间的聚集,使煤粒得到均匀分散,起到了降低黏度,提高稳定性的作用。

This paper focuses on the preparation of a new type of dispersant. As raw material, rosin went through the addition reaction with maleic anhydride and was then modified by diethanolameine to obtain the maleopimaric acid diethanolamine dispersant that was used in coal water slurry （CWS）. The effects of this dispersant on slurry forming ability in Shenhua coals were discussed. Studies on the rheologieal behaviour of CWS with different mass fractions, pH values, shearing rates, Zeta potentials for different concentrations as well as contact angle and syneresis rates during 72 h storing were carried out to analyze the interaction between the dispersants and the surface of coal particles. The studies show that the CWS had an apparent viscosity of 896.5 mPa . s, a syneresis rate of 3.2% and a Zeta potential of -23.5 mV at the shearing rate of 100 s^-1 and when the mass fractions of coals and dispersants were 64% and 0. 2% respectively. The environment of high temperature and alkaleseency was also found to be conducive to slurry forming. The dispersants can lower the viscosity of CWS because of the homogeneous moistening of coal particles through the dispersants＇ hydrophobic groups connecting to the surface of coal particles and their hydrophilic groups connecting to water molecular, which breaks coal particles gathering and increases the stability of CWS effectively.