ABSTRACT
Ground level ozone, formed by photochemical reactions of nitrogen oxides and hydrocarbons in the air, is one of the major air pollutants of concern. The need to increase production of light olefins from Fluid catalytic cracking (FCC) and reduce sulfur in FCC products provides an incentive to couple FCC with feed hydrotreating. The addition of a small concentration of ZSM-5 to the fluid catalytic cracking reactor or the incorporation of ZSM-5 in the conventional catalyst boosts the octane rating of the gasoline from the catalytic cracking units by 1 to 3 numbers. Selectoforming was the first commercial molecular shape selective catalytic process. It was designed to upgrade the octane rating of the reformate and produce LPG as the major byproduct. Reactor temperature may vary between 315 degree Celsius and the temperature of the last reformer reactor, depending on the reactor configuration.
