Developing empirical correlations from basic GPC data and deriving of fundamental GPC parameters for a given system

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Abstract
The Bartlesville Energy Research Center, in cooperation with American Petroleum Institute Research Project 60, used gel permeation chromatography (GPC) in the separation and characterization of the heavy ends of petroleum. The correlations are now being used to characterize oils from other fossil fuel sources such as coal, shale, and tar sands. By the use of retention-volume data for a few compounds, several fundamental parameters were developed and correlated. The parameters involved are expressed in terms of retention volume increments which are additive and allow precise calculation of molecular volumes, densities, and retention volumes of many compounds (without GPC experimentation) based upon retention-volume data on a few compounds. The result is an array of numerical values and groups of selective rules for their combinations. Heteroatomic molecules (N, S, and O analogs of hydrocarbons) could be included. The fundamental GPC parameter correlations can be extended and shown to be of extreme practical importance in characterizing saturate, monoaromatic, diaromatic, and polyaromatic-polar concentrates from 350/sup 0/ to 550/sup 0/C petroleum distillates. Lower boiling (200/sup 0/ to 350/sup 0/C) samples also have been analyzed by this method with excellent success.

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