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Influence of Fuel Properties on Lubricant Oxidative Stability: Part 2 - Chemical Kinetics Modelling
Technical Paper
2007-01-0003
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Previously reported tests (SAE 2005-01-3839) suggest that lubricant oxidative stability can be improved by running a spark ignition engine with fuels rich in light olefins (e.g. from a catalytically cracked refinery stream).
To further our understanding, we have modelled the influence of fuel chemistry on the kinetics of lubricant oxidation. In the hypothesis presented here, the olefins interfere with key chain branching reactions in the lubricant oxidation process and react to form epoxides, which are sufficiently volatile to leave the lubricant.
The modelling also predicts that ethanol has a directionally beneficial effect on lubricant oxidative stability. The effect of this will be limited because ethanol is much less soluble in lube-oil under prevailing engine conditions than heavier hydrocarbon components.
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Cracknell, R. and Stark, M., "Influence of Fuel Properties on Lubricant Oxidative Stability: Part 2 - Chemical Kinetics Modelling," SAE Technical Paper 2007-01-0003, 2007, https://doi.org/10.4271/2007-01-0003.Also In
References
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- The ASTM sequence VE test specifies a fuel, the “Philips J” which is known to cause sludge formation. This is rich in aromatics, olefins, and has a high final boiling point
- Cracknell R. F. Head R. A. “Influence of Fuel Properties on Lubricant Oxidative Stability” SAE Technical paper 2005-01-3839