A Generalised and Easily Adoptable Gas Chromatographic Method for the Analysis of Gaseous Hydrocarbons

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Abstract
The existing methods for the gas chromatographic analysis of C1-C5 hydrocarbons have been reviewed and were noted to be deficient in one or more of the essential parameters, such as analysis time, (less than half an hour) reproducible elution with undistorted peak, and most importantly, the nonamenability to the application of the tremendous identification power of retention index system. It has been demonstrated that the chemically bonded oxypropionitrile (OPN)/Porasil-C phase can give acceptable resolution of gaseous hydrocarbons in about 10 minutes from a 10 ft × 1/8 in column, and a much improved resolution in less than 30 minutes from a 25 ft × 1/8 in column. Retention characteristics of unsaturated hydrocarbons have been found to be radically different in the phenylisocyanate/Porasil-C column. Problems of peak identification in an unknown sample have been solved by using both the bonded columns complimented with subtraction for mono-olefins, diolefins, and acetylenes. Thereafter, the routine analysis of gaseous hydrocarbons of all complexities can be completed in less than half an hour by simultaneously chromatographing from both the chemically bonded columns in a dual gas chromatograph. The retention indices and their derivatives for the C1-C5 hydrocarbons have been compared in five stationary phases.

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