Philadelphia Energy Solutions plans to start operating a new benzene offtake terminal next month at its 335,000-barrel-per-day refinery in Philadelphia, two people familiar with the plans said. While most U.S. refiners are either selling benzene or refining it further, Philadelphia Energy Solutions is using the new terminal to help bring the chemical into the facility, according to an IPO document filed last month. The benzene facility is the latest step in building up infrastructure at a plant that was nearly shuttered in 2012. Benzene boosts the octane level of gasoline and reduces knocking in car engines, but is also a carcinogenic and the federal Environmental Protection Agency requires refiners to strip most of it out of the finished product.