Most Catalytic Condensation operations with SPA catalysts are conducted in a nonselective
mode in which the main objective is to maximize conversion and the yield of
useful products. Nonselective units tend to be operated at higher temperatures, typically
between 160◦C inlet and 200◦C outlet temperatures for propylene or propylene–
butene feeds. The objective is to maximize the yield in the gasoline fraction at a target
octane number with little regard for the occurrence of side reactions that may modify
the skeletal structure of the isomers.