Simple predictive procedure calculates heptane K-value

04/07/2003
A simple equation presented here provides good estimates of C7+ K-values, also known as equilibrium ratios. The equation is based on ethane and n-heptane K-values. It only requires the linear slope from a graph of the log of K-values vs. the square of normal boiling point.The only required information is the C7+ fraction normal boiling point. The choice of ethane and n-heptane is arbitrary; one can use any other pair of components such as methane and n-hexane.We tested the equation's accuracy against experimental data using the Soave-Redlich-Kwong equation of state. The overall average absolute error for the experimental data and the SRK was 7.41%.For Winn's equation1 the error wa...
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