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NEW YORK, May 4 (Reuters) – Marathon Petroleum will

shut a sulfur recovery unit (SRU) at the 212,000-barrels-per-day

refinery in Catlettsburg, Kentucky, on Saturday for minor

maintenance, the state regulator said.

The unit will be brought back online on May 23, according to

the state regulator.

Marathon spokesman Robert Calmus declined to comment on the

planned work at the refinery.

The company, the largest refiner in the Midwest, had

reported its planned shutdown of an Coal Tar Light Oil and

aromatics desulfurizing unit (CTLO/ADS) last week for planned

work that will last 45 days.

The refiner also experienced a malfunction at the plant,

which resulted in emissions of sulfur dioxide, according to

another filing with the Kentucky regulator.