Vapor-Liquid Equilibrium Calculation of Multi-Components System with Estimation of Pre-Heat Temperature

Abstract

This general process design for multi-components vapor-liquid equilibrium flash calculation of a two-phase system comprises bubble and dew point calculations, estimation of the flash point, calculations of the vapor split and resulted compositions with flow rates in each of the liquid and vapor phases and estimation of the pre-heat temperature needed for a specific vapor split via unprecedented theories. The technique employed entails prediction of the equilibrium temperature, based on the critical temperatures of the feed’s components, which in turn is used to estimate the corresponding flash pressure. The theories entail accommodate any light hydrocarbons’ mixture and other molecules which are of relatively uncomplicated molecular force fields, as in the case of natural gas liquid. Appropriate gases and liquid properties correlations parameters were obtained from the literatures and used in different equations most suitable for vapor-liquid equilibrium calculations of any light hydrocarbons’ mixture and other mixtures of relatively uncomplicated molecular force fields. The computer implementation puts forward for this design calculation, which can handle up to twelve components, aids the calculations of vapor-split, which requires several iterations, and other results.