Phase boundaries for synthetic light oils and gas condensate mixtures using predictive equations of state with a solid solution model

Abstract

AbstractPhase boundaries for five synthetic paraffinic mixtures were predicted using a previously developed Gibbs energy minimization algorithm. In this method, the vapour and liquid phases were described by cubic equations of state (EoS). These EoS employed a predictive temperature‐dependent group‐contribution binary interaction parameter model. The solid phase was described using a universal quasi‐chemical activity coefficient (UNIQUAC) solid solution model. Using this algorithm, the phase boundaries were calculated from a temperature‐search strategy. The predicted phase boundaries were found to be in good agreement with experimental phase boundaries for vapour‐liquid (VL), solid‐liquid (SL), solid‐vapour (SV), and solid‐vapour‐liquid (SVL) regions. The model was also used to predict the phase boundaries at low temperatures where no experimental data were available.