Method for evaluating the remaining useful life of a hydrocarbon oil
First Claim
1. A method for measuring the remaining useful life of a hydrocarbon oil containing an oil basestock and at least one additive species, comprising the steps of:
- mixing an oil sample with a solvent and a solid substrate to produce an analysis sample wherein said basestock coats said substrate;
permitting said substrate and said basestock coated thereon to settle from said analysis sample;
placing said analysis sample into an electrolytic cell;
applying an electric potential of a first value to said analysis sample to produce an electric current therethrough;
varying said potential from said first value to a second value to produce an oxidation reaction of said additive species within said cell; and
measuring and recording said current during said oxidation reaction.
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Abstract
A method is disclosed for measuring the remaining useful life of a hydrocarbon oil containing at least one additive species. An oil sample is mixed with a solvent, a solid substrate, and in some cases an electrolyte to produce an analysis sample. The analysis sample is placed into an electrolytic cell and subjected to a voltammetric analysis, whereby increasing potential is applied to the cell to produce an oxidation reaction and a varying electric current. The current during the voltammetric analysis is measured and recorded. Remaining useful life for the oil is then determined from the oxidation current wave height produced.
56 Citations
32 Claims
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1. A method for measuring the remaining useful life of a hydrocarbon oil containing an oil basestock and at least one additive species, comprising the steps of:
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mixing an oil sample with a solvent and a solid substrate to produce an analysis sample wherein said basestock coats said substrate; permitting said substrate and said basestock coated thereon to settle from said analysis sample; placing said analysis sample into an electrolytic cell; applying an electric potential of a first value to said analysis sample to produce an electric current therethrough; varying said potential from said first value to a second value to produce an oxidation reaction of said additive species within said cell; and measuring and recording said current during said oxidation reaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for measuring the remaining useful life of a hydrocarbon oil containing an oil basestock and at least one substituted phenol antioxidant species or an oxidation product of a substituted phenol with antioxidant capacity, comprising the steps of:
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mixing an oil sample with a solvent, an inorganic base and a solid substrate to produce an analysis sample wherein said basestock coats said substrate; permitting said substrate and said basestock coated thereon to settle from said analysis sample; placing said analysis sample into an electrolytic cell; subjecting said analysis sample to a voltammetric analysis, whereby a varying electric current is produced during an oxidation reaction within said cell; and measuring and recording said current during said voltammetric analysis. - View Dependent Claims (30, 31)
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32. A method for measuring the remaining useful life of a hydrocarbon oil containing an oil basestock and at least one metal dithiodiphosphate multi-function species or an oxidation product of a metal dithiodiphosphate with antioxidant capacity, comprising the steps of:
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mixing an oil sample with a solvent, an electrolyte and a solid substrate to produce an analysis sample wherein said basestock coats said substrate; permitting said substrate and said basestock coated thereon to settle from said analysis sample; placing said analysis sample into an electrolytic cell; subjecting said analysis sample to a voltammetric analysis, whereby a varying electric current is produced during an oxidation reaction within said cell; and meausring and recording said current during said voltammetric analysis.
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Specification