IMPROVING THE TREATMENT OF HEAVY HYDROCARBONS BY THE SRK EOS

A new expression is proposed for the temperature dependence of the att ractive parameter of the SRK equation of state. The new function is a two-parameter extension of the original form and can be applied to pol ar and non-polar compounds. By correlation of vapor pressures generate d by the Lee-Kesler equation, expressions have been derived to predict the parameters of non-polar compounds from the acentric factor. They should allow a more reliable extrapolation of heavy hydrocarbon vapor pressures below their boiling point, with respect to the original SRK equations.