Abstract
Deasphalted vacuum residua of heavy and medium Venezuelan crude oils were separated into saturates, aromatics and two types of resins with a preparative high-performance liquid chromatographic system. The separation was achieved with a combination of silica and cyano-bonded silica columns and cyclopentane, chloroform-methanol and chloroform as eluents. The maximum sample load was 250 mg. Automated repetitive injection allowed the unattended separation of 3 g of sample in 8 h. Fractions were totally recovered from the colomns (100.1 ± 1.3%) and the efficiency of the separation was determined by elemental analysis of whole samples and collected fractions.
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