Abstract
1. The rich-mixture performance number of aviation gasolines depends on the contents of aromatic and naphthenic hydrocarbons. The higher the concentrations of these hydrocarbon groups, the higher the rich-mixture performance number. 2. Catalytically reformed naphthas are high in knock resistance and therefore are promising base stocks for producing aviation gasolines. The presence of o-xylene in the naphthas reduces the rich-mixture performance numbers. 3. Rich-mixture ratings on aromatic hydrocarbons show high lead susceptibilities, with the exception of oxylene, which has a negative lead susceptibility. Lean-mixture ratings on aromatic hydrocarbons show only very slight lead susceptibilities.
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