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* Oily residue drifts to adjacent neighborhood
* Rest of refinery operating normally (Adds company comment)
NEW YORK, Sept 27 (Reuters) - Sunoco Inc (SUN.N) shut down one of its hydrodesulfurization units at its 335,000 barrel-per-day refinery in Philadelphia early Saturday morning, the company said on Monday.
"At about 2:00 AM Saturday morning, we experienced an upset at one of our hydrodesulfurization units at the Philadelphia refinery which resulted in a diesel mist being released into the atmosphere," said Thomas Golembeski, a spokesman for the company.
Trade sources said the unit shutdown was a diesel hydrotreater.
Golembeski said the diesel mist was carried by the wind into a neighborhood adjacent to the refinery where residents awoke to find a clear, oily residue on about 100 to 150 cars.
The rest of the refinery was operating normally, the company said. (Reporting by Janet McGurty)