Abstract
A new method is presented for the correlation and prediction of the effect of temperature on viscosity of liquid hydrocarbons and their mixtures. A one-parameter viscosity-temperature equation is described that has been validated with data for approximately 360 pure liquid hydrocarbons, including paraffins, olefins, cyclopentanes, cyclohexanes, naphthenes and aromatics. The viscosity data for all hydrocarbons are represented well by: log (μ + 0.8) = Θ(ΦT)b, where μ is in mPa s, T in kelvin, and Θ = 100; Φ = 0.01 for pure hydrocarbons. For most compounds, parameter b follows systematic trends with several properties, such as molar mass, boiling point, critical temperature and acentric factor. The usefulness of the one-parameter equation is extended to the viscosity of oil-sand bitumens diluted with light gases or liquid diluents. This is accomplished by combining the viscosity equation with simple mixing rules. The predictions for mixture viscosity, spanning several orders of magnitude, are in excellent agreement with data over wide ranges of temperature and composition.
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