A generalized vapor pressure equation for heavy hydrocarbons

摘要: Abstract Twu, C.H., Coon, J.E. and Cunningham, J.R., 1994. A generalized vapor pressure equation for heavy hydrocarbons. Fluid Phase Equilibria, 96: 19-31. Pitzer's acentric factor is widely used in physical property estimations; one important area that of correlations. Since defined terms the at a reduced temperature equal to 0.7, using this approach generalize gives excellent accuracy temperatures between 0.7 1.0, but predicts pressures less accurately lower temperatures. To improve prediction hydrocarbons low temperatures, definition re-examined modified proposed. Two sets equations are presented, with factor, respectively, as third corresponding states parameter. These two applied from triple point critical point. Both correlations give more accurate predictions than Lee-Kesler (1975) 2 correlation, especially correlation parameter being most accurate. Additionally, an internally consistent proposed estimating normal boiling point, petroleum fractions single data The procedure uses either work estimation use state.