The refiner plans to restart a catalytic cracking unit, a gasoline hydrotreater, an alkylation unit, three sulfur recovery units and a girbotol unit, it said in a filing to the Texas Natural Resource Conservation Commission.

The restart, to take place between Feb. 3 and March 1, will result in estimated emission of about 52,000 pounds of carbon monoxide and 1,700 pounds of sulfur dioxide, Shell said.

The Deer Park refining and petrochemical complex, which is capable of processing 340,000 barrels of oil daily, is the sixth largest refinery in the U.S., according to Shell"s website.

PIN/Bloomberg