Abstract
Two rapid high-performance liquid chromatographic techniques (< 15 min) for separating light and heavy gasolines into saturated, olefinic and aromatic compounds are described. The first one involves adsorption chromatography, and the choice of stationary phase (silica gels of various specific surface areas) and mobile phase (nature, water content) is discussed in terms of chromatographic performance and the characteristic of the petroleum product (boiling point, solubility, etc.). The second method is based on charge-transfer chromatography with silver-coated silica gel or silver chemically bonded to silica gel and n-pentane as mobile phase. The water content is not so critical as in adsorption chromatography. Both methods offer a significant improvement in resolution, especially between saturated and olefinic compounds.
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