Ali Mehdizadeh - Chemical, Polymeric, and Petrochemical Research Division, Faculty of Upstream Research and Development, Research Institute of Petroleum Industry IRPI, Tehran, Iran
Fakhrotolou Masoumi - Chemical, Polymeric, and Petrochemical Research Division, Faculty of Upstream Research and Development, Research Institute of Petroleum Industry IRPI, Tehran, Iran
Amir Nasser Ahmadi - Chemical, Polymeric, and Petrochemical Research Division, Faculty of Upstream Research and Development, Research Institute of Petroleum Industry IRPI, Tehran, Iran
Marzieh Shekarriz - Chemical, Polymeric, and Petrochemical Research Division, Faculty of Upstream Research and Development, Research Institute of Petroleum Industry IRPI, Tehran, Iran
Shahriar Ghamami - Department of Chemistry, Imam Khomeini International University, Qazvin, Iran

The effect of coating silica nanoparticles by several ۱-alkyl-۳-methylimidazolium hexafluorophosphate ionic liquids of [Rmim][PF۶] general formula (R= C۱۰, C۱۲, and C۱۴) on the water removal efficiency of silica nanoparticles from crude oil emulsions have been studied in this study. The ionic liquids have been prepared and characterized by comparing their ۱HNMR and FT-IR spectra with those reported in the literature. In addition, the effects of factors including cation alkyl chain length and concentration of the ionic liquids prepared on the water separation efficiency of the demulsifier have also been investigated to determine the optimal values for the chain length and concentration of the ionic liquid. [C۱۴mim][PF۶] ionic liquid at a concentration of ۱۲۰۰ ppm was shown to be the most efficient ionic liquid among the ionic liquids studied. The water separation efficiency achieved using coated nanosilica under optimal conditions was ۹۳.۳%.

Ionic Liquids, Demulsification, Crude Oil, Silica Nanoparticles