PETR 75 |
| Mutagenicity has been related to polynuclear aromatics (PCA). Results from long term mouse skin painting carried out by Shell for base oils demonstrated a correlation between tumor incidence and weight percentage of DMSO (dimethyl sulfoxide) extract. Results showed that base oils containing more than 3% by weight of PCA should be regarded as carcinogens. Two fractions taken from an industrial plant were hydrotreated in a Pilot Plant. This paper shows the effect of the temperature in catalytic activity of PCA removal. Five temperatures were tested. Results of mass spectrometry, associated with PCA determination show that PCA are reduced as the temperature increase. However there is a critical temperature above it the recombination of aromatics takes place increasing the PCA. Determination of this point is important to guarantee PCA below 3%. Based on this, an Hydrogen quench between the two industrial reactors was installed to keep temperatures below the critical one. |
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3rd International Symposium on Hydrotreating/Hydrocracking Technologies
1:30 PM-4:20 PM, Tuesday, August 21, 2007 Boston Park Plaza -- White Hill Rm, Oral
Division of Petroleum Chemistry |