Investigation of Oil Collection Capability of Metal Naphthenate-Based Compositions in Salyan and Naftalan Crude Oils

This study investigates the oil collection capability of compositions consisting of the nitration product of diesel fuel and various metal salts (Zn, Mn, Fe, Ni, and Co) synthesized based on the total fraction of natural petroleum acids (NPA), evaluated in Salyan and Naftalan crude oils under technical water and seawater conditions. Fourier-transform infrared spectroscopy (FTIR) analysis confirmed that nitration introduced nitro groups into the hydrocarbon structure along with aromatic and oxygen-containing functional groups. The oil collection efficiency was found to depend mainly on the nature of the metal ion and the physicochemical properties of the crude oil: for Salyan crude oil, the Co-containing composition achieved the highest efficiency in technical water (۸۴.۳۸%), while the Mn-containing composition performed best in seawater (۸۵.۰%); for Naftalan crude oil, the Co-containing reagent was most efficient in both technical water (۸۴.۰%) and seawater (۸۲.۳%). The effect of the seawater medium on efficiency varied with crude oil composition and metal naphthenate type, and time-dependent studies showed that oil slick contraction occurred mainly within the first ۲۴ hours, after which the system remained stable. Overall, the results confirm that the type of metal salt and the physicochemical characteristics of the aqueous medium play a decisive role in oil collection efficiency, with cobalt-based compositions demonstrating the most stable and highest performance across both crude oil systems, while the manganese-based system may be regarded as a particularly promising reagent for Salyan crude oil in seawater.

کلیدواژه ها:

metal naphthenates ، oil collection efficiency ، natural petroleum acids ، technical water ، seawater ، surface-active reagents