A new assault on ozone

07/11/2011
A new round of changes under consideration by the US Environmental Protection Agency for gasoline chemistry requires assessment on two levels: cost and necessity.EPA is meeting with officials of the automobile, refining, and gas processing industries to discuss a tightening of standards for gasoline sulfur content and volatility. The sulfur limit for refiners now is 30 ppm average with an 80 ppm cap. A 95 ppm sulfur cap applies downstream of the refinery gate. EPA is discussing a 10 ppm sulfur refinery average with a 20-25 ppm cap. The volatility change would eliminate a 1 psi rvp waiver for gasoline containing 10 vol % ethanol (E10), now most of the fuel sold in the US.According to oil a...
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