Semi‐synthetic motor oils derived from high paraffinic petroleum base stock

Abstract

PurposeTo prepare semi‐synthetic oils satisfying the classification API SF/CC and SAE 10W30 from mineral base oils derived from high paraffinic petroleum, synthetic alkylbenzenes base oils, and suitable additives.Design/methodology/approachThe mixtures of base mineral oils of deep hydro‐isomerization derived from high‐paraffinic petroleum (viscosity at 100°C is 12.5 cSt) and the mixtures of the synthetic alkyl aromatics oils with the naphthenic components (viscosity at 100°C of 8.0 cSt) were used as base oil. viscosity‐temperature properties, pour points, and flash points were modified by mixing of suitable additives. Octan M‐1, Octan M‐2, Octan M‐3, and Octan M‐4 oils were obtained by application of suitable additives into the prepared base oils B‐C. In order to get the SAE 10W30 requirements the viscous additive was added (0.4‐0.6 mass percent) to prepared base oils. For obtaining the API/SF/CC grade oils, package additive (Hitec 9229) additive was added (4.7 mass percent) to the mixture. The oil (Octan M‐1) was tested in the engine of Mercedes‐Benz model 230 car and positive results over 20,000 km running.FindingsIt was observed that, viscosities and pour points change linearly as the mass percent of alkylbenzenes the in the base oil mixture is changed. This realizes the possibility of the creation of semi‐synthetic motor oil of desired properties in the case of lack of other low‐viscosity synthetic component such as poly‐á‐olefins, diester and polyester oil. The obtained oils are useful for service in relatively mild climatic conditions (average temperature of the winter period −15 to −30°C).Research limitations/implicationsThe obtained oils cannot fully satisfy the requirements of the engines by pour point and low‐temperature characteristics in the absence of additives.Practical implicationsBecause of complexity of obtained mixture, it was impossible to study the structure and composition of the obtained products by modern techniques such as high field NMR spectroscopy.Originality/valueDetails practical information on preparation of four semi‐synthetic oils satisfying the classification API SF/CC are reported.