Investigation on the interaction between the lipophilic structure of anionic dispersants and Shenhua non-caking coal in coal water slurry
Investigation on the interaction between the lipophilic structure of anionic dispersants and Shenhua non-caking coal in coal water slurry
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DOI：
10.1016/j.colsurfa.2022.128812
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发表时间：
2022-03-24
影响因子：
5.2
通讯作者：
Li, Xiao
中科院分区：
文献类型：
--
作者：
Meng, Xianliang;Zhang, Tonghua;Li, Xiao
选用3种具有不同亲油结构和磺酸亲水端的阴离子分散剂，包括木质素磺酸钠（SLS）、磺化丙酮甲醛缩合物（SAF）和萘磺酸甲醛缩合物（NSF），研究不同亲油结构对吸附性能的影响及分散机理。结果表明，NSF和SAF以单分子层形式吸附在神华不粘煤表面，SLS以多分子层形式吸附在神华不粘煤表面。通过分子动力学模拟，相互作用能均为负值，表明三种分散剂均能自发吸附在SNC表面。分散剂具有简单的亲油结构，在吸附过程中空间位阻小，有利于在煤表面快速吸附，且吸附层薄，吸附位点多。而侧链多、结构复杂的分散剂，其吸附层较厚，吸附位点较少。提出了阴离子分散剂在SNC表面的分散机理。
Three anionic dispersants with different lipophilic structures and hydrophilic ends of sulfonic acid, including sodium lignin sulfonate (SLS), sulfonated acetone formaldehyde condensate (SAF) and naphthalene sulfonate formaldehyde condensate (NSF), were selected to study the effect of different lipophilic structures on the adsorption properties and dispersion mechanism. The results show that NSF and SAF are adsorbed on the surface of Shenhua non-caking coal (SNC) by single-molecular layer while SLS is adsorbed by multi-molecular layers. Through molecular dynamics simulation, the negative value of interaction energy indicates that all three dispersants can be spontaneously adsorbed on the surface of SNC. The dispersant with simple lipophilic structure has small steric hindrance during the adsorption process, which facilitate to rapidly adsorb on the coal surface with a thin layer and more adsorption sites. On the contrary, dispersants with more side chains and complex structure are adsorbed with a relatively thick layer and less adsorption sites. A dispersion mechanism of anionic dispersant on SNC surface has been proposed in this paper.