An Experimental Investigation Into the Effects of Chemical type on CO2/Heavy-Hydrocarbon Phase Behavior

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Abstract
Summary: This paper provides PVT and compositional data for seven CO2/synthetic-oil systems. The oils were composed of light paraffins plus heavy hydrocarbons selected from three chemical types: paraffins, naphthenes, and aromatics. Results for the different oils are contrasted with a comparison basis of equivalent molar-averaged normal boiling point. This parameter is easy to calculate and provides a means by which chemical effects can be quantified in the presence of oil volatility effects. The results demonstrate that two oil compositional effects control the extent of hydrocarbon extraction by CO2. The major effect is usually the oil volatility, but effects of hydrocarbon chemical type can be dominant. The data suggest a trend for the influence of chemical type on oil miscibility with CO2: paraffins are beneficial, aromatics are less beneficial than paraffins, and naphthenes are detrimental. The effect of chemical type on oil swelling is also significant.

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