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A multidimensional gas chromatographlc system Is descrlbed for obtalnlng the content of paraffln, naphthene, and aromatlcs (PNA) accordlng to both grouptype separation and separation by the number of carbons In hydrocarbon mixtures. Several examples of measured PNA results for callbration standards and practical process/product streams are glven to Illustrate the accuracy, reproduclblllty, and repeatability of the method.The Importance of uslng purified hydrogen as the carrier gas and a speclally prepared molecular sieve 13X wall-coated capillary column for Improved PIN separatlon is stressed.

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A true boiling point gas liquid Chromatograph (GLC) has been designed to measure simply and conveniently GLC data for all types of petroleum streams, including crude oils and residual fuels which contain considerable portions of high-boiling materials. The instrument generates simultaneous carbon and sulfur boiling point profiles up to 538°C (C42). A quantitative measure of the nonvolatile organic portion of the sample is achieved by backflushing and combusting the material remaining in the inlet. Thus, identification of oil pollution samples is facilitated by obtaining data on the carbon and sulfur distribution and the amount of residue in a single, rapid analysis. Under certain circumstances, the total recovery capability also permits the extent of weathering of oil pollution samples to be determined directly from the chromatographic results.