Flash point prediction of binary totally and partially miscible water-alcohol mixtures by cubic-plus-association (CPA) equation of state

In this study, a vapor pressure-based model is applied to predict the flash points of binary partially miscible aqueous-organic mixtures including 1-butanol-water, 2-butanol-water, isobutanol-water, and 1-pentanol-water. The high non-ideality of these systems is taken into account by cubic-plus-association equation of state using two known combining rules in association energy term, Elliot combining rule (ECR) and CR-1 combining rule. The model by ECR was utilized to totally miscible aqueous-organic in literature, while this study also examines CR-1 combining rule in predicting the flash point of these mixtures. The obtained results by ECR are much more accurate than CR-1 ones for all studied mixtures. Moreover, the average absolute deviation and root mean square deviation of ECR results are less than 1 K and 1.18 K, respectively, for all studied mixtures, which indicates that the predictive model can accurately predict the flash point of these systems at the studied composition ranges.