In this study, various cationic surfactants and MgO nanoparticles were used for dehydration of crude oil. The results of bottle tests exhibited that in demulsification of crude oil in the serious of alkyl trimethyl ammonium bromide homologs (CnTAB, n = 12, 14, and 16) with the increase of alkyl chain length, the optimum concentration level decreased and speed of dehydration decreased. Also, for surveying the role of head group, two cetrimonium bromide and cetylpyridinium bromide surfactants were used. Evaluation of the counter ion effect indicated in the high concentration of surfactants the counter ion can greatly influence the demulsification performance. Moreover, for enhancing demulsification, MgO nanoparticles were mixed with cetrimonium bromide (CTAB) surfactant. The mixture of MgO nanoparticles and CTAB (in ratio 1:3) could dehydrate crude oil in 300s. For better understanding of asphaltene-demulsifier interaction, was used the quantum calculation. The results demonstrate MgO interacts with asphaltene strongly.

As well as the result of asphaltene adsorption on MgO indicate the asphaltene adsorption flow from Freundlich model. Finally, the interaction energy between surfactants or MgO and asphaltene were estimated by quantum calculation.

在这项研究中，各种阳离子表面活性剂和 MgO 纳米颗粒用于原油脱水。瓶装试验结果表明，在原油破乳中，烷基三甲基溴化铵同系物（CnTAB，n=12、14、16）随着烷基链长度的增加，最佳浓度水平降低，脱水速度降低。减少。此外，为了调查头部基团的作用，使用了两种西曲溴铵和溴化十六烷基吡啶表面活性剂。抗衡离子效果的评价表明，在高浓度的表面活性剂中，抗衡离子可以极大地影响破乳性能。此外，为了增强破乳作用，将 MgO 纳米颗粒与溴化西曲溴铵 (CTAB) 表面活性剂混合。MgO纳米颗粒和CTAB的混合物（比例为1：3）可以在300s内使原油脱水。为了更好地理解沥青质-破乳剂的相互作用，使用了量子计算。结果表明 MgO 与沥青质强烈相互作用。

以及沥青质在 MgO 上的吸附结果表明了来自 Freundlich 模型的沥青质吸附流。最后，通过量子计算估算了表面活性剂或 MgO 与沥青质之间的相互作用能。