Bloomberg reports that ConocoPhillips has shut the main sulfur recovery unit at its Lake Charles refinery in Westlake, Louisiana. The unit was shut after a leak was discovered. The refinery shut a unit because hydrogen sulfide was leaking from piping, according to a filing with the National Response Center. The filing didn’t identify the unit. Sulfur recovery units capture and hold sulfur removed during desulfurization. The refinery processes mostly heavy, high-sulfur crude oil. Its main products are transportation fuels such as gasoline and jet fuel. The plant, near Lake Charles in southwestern Louisiana, has a capacity of 252,400 barrels of oil a day, according to the Energy Department.