Abstract
An experimental study was conducted to investigate the relative efficiency of phenol-water-ether mixture and nitrobenzene system for deasphalting low-asphaltic crude oil residue. Results obtained from the gas-liquid, adsorption-elution and gel permeation chromatographic analyses of the raffinate and extract products revealed an upward trend of the solubility power and the selectivity of the phenol system (for asphaltic material) with solvent-to-residue ratio (SRR). This led to an oil recovery efficiency of 98% at an SRR of 6 compared to 93% achieved with nitrobenzene. However, the deasphalted oil (raffinate) obtained with nitrobenzene contains more of the most desirable saturates. There is also an evidence of improved oil composition at lower solvent-to-residue ratio, due principally to the decline in the selectivity of nitrobenzene toward the asphaltic component at higher solvent proportions. Judging by all the information obtained from this study, phenol-water-ether mixture appears to be a more efficient solvent system than nitrobenzene for deasphalting low-asphaltic crude oil residue.
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