Low-temperature viscosity of lube oils mixed with paraffinic base oil and naphthenic base oil at different mass ratios has been tested by experiments. The influence of paraffinic base oil on the performance of naphthe...Low-temperature viscosity of lube oils mixed with paraffinic base oil and naphthenic base oil at different mass ratios has been tested by experiments. The influence of paraffinic base oil on the performance of naphthenic base oil was investigated by studying the low-temperature viscosity of tested oils. The viscosity of lube oils increased with an increasing content of high-viscosity paraffinic base oil in the oil mixture. And the low-temperature viscosity was less influenced when the content of paraffinic base oil in the mixture was insignificant. In order to reduce the cost for formulating lubricating oil, a small fraction of paraffinic base oil can be added into naphthenic base oil as far as the property of lubricating oil can meet the specification. According to the study on low-temperature viscosity of the oil mixed with paraffinic base oil and naphthenic base oil, a basic rule was worked out for the preparation of qualified lubricating oils.展开更多
The saturate,aromatics,resin and asphaltene components of paraffin-base(PB)and naphthenic-base(HB)crude oil are separated by chromatographic column.The acidic components of crude oil are extracted by compounded polar ...The saturate,aromatics,resin and asphaltene components of paraffin-base(PB)and naphthenic-base(HB)crude oil are separated by chromatographic column.The acidic components of crude oil are extracted by compounded polar solvents and identified by methyl esterification of diazomethane.The acidic components before and after asphaltene removal are investigated by gas chromatography-mass spectrometer.The effect of four fractions in simulated oil on interfacial activity is discussed.The results show PB is rich in naphthalene series and tri-aromatic steroids,and HB has a high content of phenanthrene series,chrysene series and methylpyrene,besides higher content of naphthalene series.The long carbon chain acids in HB oil decrease significantly by asphaltenes removal,confirming the presence of heavy oil acids in asphaltene.A little amount of saturates and aromatics in simulated oil can reduce the interfacial tension(IFT).When the content of asphaltenes of simulated oil is increased,IFT is initially decreased and finally increased because of stability of asphaltenes.When resin is increased,IFT is initially increased and then decreased.Simulated oil containing the resin from naphthenic-base oil is more sensitive to alkali than that of paraffin-base resin,which can reduce the IFT between oil and water at a larger range.展开更多
文摘Low-temperature viscosity of lube oils mixed with paraffinic base oil and naphthenic base oil at different mass ratios has been tested by experiments. The influence of paraffinic base oil on the performance of naphthenic base oil was investigated by studying the low-temperature viscosity of tested oils. The viscosity of lube oils increased with an increasing content of high-viscosity paraffinic base oil in the oil mixture. And the low-temperature viscosity was less influenced when the content of paraffinic base oil in the mixture was insignificant. In order to reduce the cost for formulating lubricating oil, a small fraction of paraffinic base oil can be added into naphthenic base oil as far as the property of lubricating oil can meet the specification. According to the study on low-temperature viscosity of the oil mixed with paraffinic base oil and naphthenic base oil, a basic rule was worked out for the preparation of qualified lubricating oils.
基金financial support by the National Natural Science Foundation of China(51474035).
文摘The saturate,aromatics,resin and asphaltene components of paraffin-base(PB)and naphthenic-base(HB)crude oil are separated by chromatographic column.The acidic components of crude oil are extracted by compounded polar solvents and identified by methyl esterification of diazomethane.The acidic components before and after asphaltene removal are investigated by gas chromatography-mass spectrometer.The effect of four fractions in simulated oil on interfacial activity is discussed.The results show PB is rich in naphthalene series and tri-aromatic steroids,and HB has a high content of phenanthrene series,chrysene series and methylpyrene,besides higher content of naphthalene series.The long carbon chain acids in HB oil decrease significantly by asphaltenes removal,confirming the presence of heavy oil acids in asphaltene.A little amount of saturates and aromatics in simulated oil can reduce the interfacial tension(IFT).When the content of asphaltenes of simulated oil is increased,IFT is initially decreased and finally increased because of stability of asphaltenes.When resin is increased,IFT is initially increased and then decreased.Simulated oil containing the resin from naphthenic-base oil is more sensitive to alkali than that of paraffin-base resin,which can reduce the IFT between oil and water at a larger range.
