Abstract
In the present study, SiO2 nanoparticles (NP) were used for dehydration of crude oil. Also, in order to enhance the hydrophobicity and hydrophilicity of the nanoparticles, they were functionalized respectively with oleic acid (OA) and sodium dodecyl benzene sulfonate (SDBS) surfactant. Furthermore, graphene oxide (GO) was employed to synthesis GO-SiO2 nanocomposite as a superhydrophilic demulsifier. Nanodemulsifiers were characterized with scanning electron microscopy (SEM), field-emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller method (BET), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and zeta potential. Additionally, the performance of nanodemulsifiers was evaluated with bottle test. The results of bottle test revealed that GO-SiO2 nanocomposite has the best performance among all nanodemulsifiers and dehydration of crude oil was completed during 90 min (while dehydration of crude oil with SiO2 nanoparticle was done at 110 min). Moreover, the effects of temperature and salt were surveyed and the results demonstrated that both factors influence the stability of water in oil emulsion. The outcomes of the interfacial tension (IFT) at the water/crude oil interface displayed GO-SiO2 nanocomposite has interface active property and can decrease IFT from 14.38 mN m−1 to 2.44 mN m−1.
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