Exxonmobil Research and Engineering Company

Mobil Oil Corporation

Paul Thomas Reischman

Rafi Jalkian

Rene B LaPierre

Randall D Partridge

George T Kerr

Kevin John Kelly

Vincent Mark Carey

Lawrence J Altman

A method for determining contamination in marine diesel lubricating oils. The method has been found to have particular utility in estimating asphaltenes contamination in marine diesel lubricating oils. The method includes the steps of: (a) obtaining spectral raw data over a frequency range substantially equivalent to that of ultraviolet-visible light for reference lubricating oil samples with known properties and concentrations of asphaltenes; (b) performing chemometric techniques to the spectral raw data obtained in step (a) to develop a calibration model and calibrate the spectral data with actual values for parameters reflecting the level of asphaltenes contamination of the reference samples, the actual values determined by means of conventional analytical methods; (c) obtaining spectra of samples of marine diesel lubricating oil of unknown concentration of asphaltenes over a frequency range substantially equivalent to that of ultraviolet-visible light; and (d) processing the obtained spectral raw data of step (c) and applying the developed calibration model to the processed data in order to determine the parameters reflecting the level of asphaltenes present in the marine diesel lubricating oil.

Method for determining asphaltenes contamination in used marine engine lubricants using UV-visible spectroscopy and chemometrics

A method for determining contamination in marine diesel lubricating oils. The method has been found to have particular utility in estimating residual fuel and insolubles contamination in marine diesel lubricating oils. The method includes the steps of: (a) obtaining spectral raw data over a frequency range substantially equivalent to that of ultraviolet-viable light for reference lubricating oil samples with known properties and concentrations of residual fuel and insolubles; (b) performing chemometric techniques to the spectral raw data obtained in step (a) to develop a calibration model and calibrate the spectral data with actual values for parameters reflecting the level of residual fuel and insolubles contamination of the reference samples, the actual values determined by means of conventional analytical methods; (c) obtaining spectra of samples of marine diesel lubricating oil of unknown concentration of residual fuel and insolubles over a frequency range substantially equivalent to that of ultraviolet-viable light; and (d) processing the obtained spectral raw data of step (c) and applying the developed calibration model to the processed data in order to determine the parameters reflecting the level of residual fuel contaminants and insolubles present in the marine diesel lubricating oil.

Method for determining residual fuel and insolubles contamination in used marine engine lubricants using UV-visible spectroscopy and chemometrics

A method to employ instrumentation to effectuate variation in lubricant flow rate or properties in response to actual engine conditions. Preferably, the present invention provides a method for the in situ monitoring of the lubricating oil's effectiveness in a two-stroke diesel engine by measuring the used lubricant's Fe content and fuel sulfur content with XRF technology and the used lubricant's BN with an IR measurement device, and for efficiently modifying the lubricant's properties and/or flow rate to the equipment in response to the actual wear or corrosion needs of the machinery or engine.

Method of employing instrumentation to efficiently modify a lubricant's flow rate or properties in an operating all-loss lubricating system

Vanadium in marine diesel lubricating oils resulting from raw fuel dilution is detected and quantified by way of an analytical technique employing electron spin resonance (ESR). Dilution of the lubricating oil with residual fuel oils results in the presence of vanadium in the lubricating oil in a form which is capable of being observed by ESR; by contrast, vanadium resulting from the presence of fuel oil combustion products (pentavalent vanadium) in the lubricating oil is not observed by ESR. The method therefore enables fuel vanadium, typically present as vanadyl porphyrins, to be differentiated from vanadium resulting from blow-by in the engine so that the operating condition of the engine may be monitored.

Method for detecting fuel dilution of marine lubricating oils

Zeolite Y and other faujasite type zeolites are made stable to acid by calcination in a steam-containing atmosphere with a slow, controlled heating rate in the temperature range at which chemically bound water in the zeolite is given off, generally from 500.degree. C. to 650.degree. C. The stabilized product may be extracted with acid to produce a zeolite having a higher silica:alumina ratio. The high silica forms of zeolite ZSM-20 which may be produced by this method are novel materials.

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Lambertville, NJ, United States of America

Paul Thomas Reischman