Thermodynamics of associated solutions: vapour-liquid equilibrium for the acetic acid-propanoic acid and propanoic acid-water systems with association

Geometric Structures of Associating Component Optimized toward Correlation and Prediction of Isobaric Vapor–Liquid Equilibria for Binary and Ternary Mixtures of Ethanal, Ethanol, and Ethanoic Acid

“…Ethanoic acid as the associating component has been the subject of many previous theoretical studies. − However, what is the formation state of existence for the ethanoic acid in both phases? Generally speaking, we do not know which is the formation state of existence for ethanoic acid in monomers, dimers, trimers, or even higher polymerizations.…”

“…Wisniak et al presented the new strategies for VLE data of extreme deviation from ideal behaviors containing carboxylic acid were systematically explored to solve the problem of the correlation and prediction of multicomponent systems containing the associating carboxylic acid and created the new theory, model, and consistency test of associating systems. − Moreover, Marek and Standart explored the correlation and prediction of vapor and liquid phase components containing ethanoic acid associating systems, which wholly formed the theory and model for the ethanoic acid associating nonideal behaviors in vapor and liquid phases. , In addition, Nagata et al studied an association model was developed to correlate the isothermal VLE data of the binary systems containing carboxyl acid associating component. The model uses a concentration-dependent mole fraction association constant for carboxylic acids in the liquid phase, with allowance for molecular interactions between the true chemical species expressed by the NRTL (nonrandom two-liquid) equation. − In our recent work, we have concluded that the VLE data of the systems containing the associating carboxylic acid were correlated and predicted based on Tpx data. , Though there are many VLE systems containing the associating components investigated by the different research groups in this field, respectively, novel strategies have been extensively exploring to build the theory and model for the ternary and constituent binary systems containing the associating carboxylic acid, owing to the extensively associating effects occurring to them resulting in the most stable formation state for associating component unknown and the difficulty of model correlation and prediction. That is to say, from the appearance point of view, the binary system containing the associating component is binary; however it is actually ternary, quaternary, and even higher multicomponent.…”