An Improved Method for Determining the Hydrocarbon Fraction of Diesel Particulates by Vacuum Oven Sublimation 872136
A new vacuum-oven sublimation method (PVOS) for measuring the hydrocarbon fraction of diesel particulates has been developed to overcome problems with the standard vacuum-oven sublimation technique (VOS). VOS gave extremely low (negative at 15:1 A/F) results for diesel particulate samples taken at medium to high load (25:1 or lower A/F). The low results are due to the adsorption by the samples of trace amounts of continuously regenerated (from test samples and oven seals) heavy-hydrocarbon oven contaminants. PVOS corrects the problem by using a nitrogen gas purge to sweep hydrocarbons from the oven during testing. Comparisons among PVOS, VOS and methylene chloride extraction (MCE) over a range of A/F and engine speeds showed that PVOS results correlate more closely with MCE results than do results determined by the standard VOS technique.
Citation: Halsall, R., McMillan, M., and Schwartz, B., "An Improved Method for Determining the Hydrocarbon Fraction of Diesel Particulates by Vacuum Oven Sublimation," SAE Technical Paper 872136, 1987, https://doi.org/10.4271/872136. Download Citation
R. Halsall, M. L. McMillan, B. J. Schwartz
GM Res. Labs., GMC, Univ. of California
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition
SAE 1987 transactions: Fuels and Lubricants-V96-7