The most significant processing unit for aviation gasoline (avgas) manufacture at Chevron U.S.A. refineries is the alkylation plant. This plant produces aviation alkylate, the principal component for avgas blending. To understand the alkylation process, a brief description is presented of crude oil distillation and further refinery processing to make alkylation feedstocks. The alkylation process and aviation alkylate recovery is reviewed. Chevron operates both sulfuric and hydrofluoric acid alkylation plants.
Typical aviation alkylate composition requires blending other components into avgas including light naphtha, toluene, and other blend stocks. Constraining elements of the specification that determines blend components for finished avgas are discussed. The refinery method for determining the proper ratio of component addition, blending, and testing to meet specifications are presented.
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