abstract
This work covers the phase equilibrium characterization of systems containing n-heptane, toluene, and two tricyanomethanide-based ionic liquids (ILs), 1-ethyl-3-methylimidazolium tricyanomethanide ([C(2)C(1)im][TCM]) and 1-butyl-4-methylpyridinium tricyanomethanide ([4-C4C1py][TCM]). Aiming at evaluating these ILs for the n-heptane/toluene extractive distillation, the vapor-liquid-liquid equilibria (VLLE) and vapor-liquid equilibria (VLE) were determined by headspace-gas chromatography (HS-GC) in the whole composition range at temperatures from 323.2 to 423.2 K and solvent to feed (S/F) ratios of 1, 5, and 10. Experimental results were modeled with the Cubic Plus Association (CPA) Equation of State (EoS). ILs' molecular parameters were regressed through density and heat capacity data and further used to describe the binary and ternary mixtures phase equilibria. Extractive distillation with ILs stands as a powerful approach for the dearomatization of liquid fuels, whereas the combination of HS-GC methodology and CPA EoS has been revealed as an ideal strategy to further exploring this new technology.
keywords
EQUATION-OF-STATE; NAPHTHA FEED; PYROLYSIS GASOLINES; RECOVERY SECTION; BINARY-MIXTURE; DESIGN; PLUS; AROMATICS; DESULFURIZATION; BTEX
subject category
Engineering
authors
Navarro, P; Ayuso, M; Palma, AM; Larriba, M; Delgado-Mellado, N; Garcia, J; Rodriguez, F; Coutinho, JAP; Carvalho, PJ
our authors
André Palma
Post-Doc Fellowship
Pablo Navarro Tejedor
Post-Doc Fellowship
Pedro J. Carvalho
Assistant ProfessorProjects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Projeto de Investigação Exploratória: Pedro Carvalho (IF/00758/2015)
acknowledgements
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (ref. FCT UID/CTM/50011/2013) funded by FEDER through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) and by national funds through FCT-Fundacao para a Ciencia e a Tecnologia. We are also grateful to Ministerio de Economia y Competitividad (MINECO) of Spain and Comunidad Autonoma de Madrid for financial support of projects CTQ2017-85340-R and S2013/MAE-2800, respectively. P.N. and P.J.C. also thank FCT for awarding their postdoctoral grant (SFRH/BPD/117084/2016) and contract under the Investigator FCT 2015 (IF/00758/2015), respectively. N.D.-M. also thanks MINECO for awarding her an FPI grant (BES-2015-072855). M.L. thanks Ministerio de Eduacion, Cultura y Deporte of Spain, for awarding him a Jose Castillejo postdoctoral mobility grant (CAS17/00018). We thank Infochem-KBC because the Multiflash program was applied for the CPA EoS calculations.