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 − 0.4 and + 0.4 , 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 P c , T c and ω as inputs is established.
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