Abstract
Two chromatographic methods for the SAR (saturates, aromatics, and resins) separation of crude oil samples are compared. Open column chromatography (OPC) using silica and subsequent elution with heptane, toluene, and toluene/methanol is contrasted with flow reversal (back-flushing) high-performance liquid chromatography (HPLC) using an amino-modified silica column with heptane, dichloromethane, and chloroform as elution solvents. The fractions obtained in both methods have been characterized with gel permeation chromatography−THF and FTIR. It is demonstrated that the OPC system is unable to effectively separate the aromatic nonpolar hydrocarbons in crude oil from the resin fraction. The OPC toluene mobile fraction corresponds mostly to resin-type material, but some nonpolar aromatics are present. The toluene/methanol mobile fraction from OPC corresponds only to the most polar part of the resin fraction. Different sample:silica mass ratios from 1:4 to 1:20 were tested for the OPC system. Similar separation...
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