Also known as: light straight run naphtha, LSR, natural gasoline, light paraffinic naphtha, pentanes plus, C5+
Light naphtha can refer to either a finished product used as a petrochemical feedstock or a distillation cut commonly called light straight run naphtha. It is composed of pentane and slightly heavier material.
In a refinery, light naphtha is often blended directly into gasoline. However, its low octane and relatively high vapor pressure typically limit it to 5% or less of the gasoline pool. To boost its octane, it is often sent to the isomerization unit before gasoline blending.
As a petrochemical feed stock, light naphtha is used in steam crackers to make ethylene and ultimately make plastics. In this use, it competes with propane and ethane as a feedstock. Highly paraffinic naphtha is preferred in this use as it provides better yields than more naphthenic or aromatic naphthas.