Modeling the viscosity versus temperature and pressure of light hydrocarbon solvents

Our viscosity-temperature correlation (Miadonye and D'Orsay,J. Mater Eng. Perform., 2006, 15(1), p 13–18; Ref 1) has been extended in this work to estimate the viscosity of light hydrocarbons between a temperature range of 223.15 and 433.15 K and a pressure range from 0.1 to 240 MPa. The correlation was modified to include a pressure term that contains the pressure parameters Ψ and Ω. The value for Ω was obtained as a constant, and the value of the parameter Ψ was derived from viscosity-temperature-pressure relationship and is unique for each hydrocarbon sample. With the pressure parameter, Ψ, and the shape factor constant, Φ, the model produces an average absolute deviation of 2.3% for a total number of 503 data points, an improvement of 46% on correlations with similar simple characteristics. The value of Ψ has been determined for several light hydrocarbon samples, including crude oil fractions.