Deep eutectic solvents (DESs) have been recognized as a benign solvent in many applications including reaction media, catalyst, and biomass conversion. Since the exciting discovery of DESs by Abbott and coworker in 2003, the amounts of research accomplishments has increased tremendously in terms of published in science and technology, in particular, petroleum engineering. DESs are mixtures of a salt and a hydrogen bond donor (HBD) and a hydrogen bond acceptor (HBA). One of most utilized DESs was prepared by using urea as a HBD and choline chloride (HBA) as well as other DESs in this study.
Owing to similar vapor pressure of both toluene and heptane, it is not realistic to apply distillation column to separate toluene from heptane containing mixture. It has been widely accepted to apply extraction process to enrich toluene from toluene lean mixture containing heptan rich counterpart compounds. Liquid-liquid equilibria (LLE) behavior was determined using an experimental setup, comprising water jacked glass vials, water circulator, and temperature controller. LLE were measured at three different temperatures, 293.13, 303.15 and 313.15 K. The nuclear magnetic resonance (NMR) and gas chromatography with FID detector were used for determination of phase compositions of each phase. The data obtained experimentally were correlated with the NRTL thermodynamic model.
Yoon Kook Park is a Professor at Hongik University at Sejong in S. Korea. He has published more than 40 research articles, a book chapter and several patents. He has been serving as an editorial board member of the Korean Journal of Chemical Engineering.