Abstract :
A new simple equation for the vapour-pressure of pure substances is proposed. It is a three-constant non linear correlation that reproduces with high accuracy the vapor–liquid equilibrium data, even at low reduced temperatures. Applied to 34 fluids with acentric factors varying in the range between image and image, the model is shown to be very performant. The average relative deviation between thee data and the estimated values is in the order of 0.16%, with a maximum at 0.3%. Based on this model an accurate three-parameter generalized vapor pressure correlation which needs image and image as inputs is established.
