Bloomberg reports that Exxon Mobil Corp. restarted a unit at its Baton Rouge, Louisiana, chemical plant, according to a filing made with the National Response Center. Benzene was released from a vapor recovery system after an equipment failure yesterday, the filing showed. U.S. refineries must notify the center if they release hazardous substances in excess of reportable quantities, according to the Comprehensive Environmental Response, Compensation and Liability Act, commonly known as Superfund. Bloomberg News couldn’t immediately verify that the information in the filing was accurate. The plant receives feedstock from the adjacent 503,000- barrel-a-day Exxon refinery.