abstract
The description of the critical data of a mixture is of importance for various applications such as supercritical processes, reactions close to the critical temperature, or safety design in piping. In a previous work, we have shown that a modified cubic-plus-association (CPA) equation of state is able to provide an accurate representation of critical points for mixtures of associating compounds or for mixtures of associating compounds with hydrocarbons. In the present work, this study is extended to mixtures containing associating and solvating compounds. Binary and ternary mixtures of alkanols, diethylamine or water with ketones, aromatics, ethers, tetrahydrofuran, or diethyl carbonate are studied. Binary interaction parameters are fitted from subcritical LLE or VLE data. For the binary mixtures, when analyzing the curves of T-c and P-c versus composition, the average deviation on P-c is below 2.4%, while the average Delta T-c is below 2.5 K. Three ternary mixtures are also investigated. For these, deviations are below 4.0% and 4.3 K, respectively.
keywords
VAPOR-LIQUID-EQUILIBRIA; EQUATION-OF-STATE; PERTURBED-CHAIN SAFT; PHASE-EQUILIBRIA; BINARY-MIXTURES; CRITICAL-TEMPERATURES; TERNARY MIXTURES; UNNOTICED PITFALLS; COMPLEX-MIXTURES; CRITICAL-POINTS
subject category
Engineering
authors
Palma, AM; Queimada, AJ; Coutinho, JAP
our authors
André Palma
Post-Doc Fellowship
acknowledgements
This work was funded by KBC Advanced Technologies Limited (A Yokogawa Company). Andre M. Palma acknowledges KBC for his PhD grant. Tony Moorwood is acknowledged for mentoring this project and providing helpful insights. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement.