Phase equilibria for the mixtures of the deep eutectic solvent L-menthol + thymol plus CO2 at high pressure

Pérez Velilla, Eduardo; Rato, Sergio; Loaisa, Gema; Cabañas Poveda, Albertina

Phase equilibria for the mixtures of the deep eutectic solvent L-menthol + thymol plus CO2 at high pressure

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Official URL

https://doi.org/10.1016/j.jiec.2023.01.034

Publication date

2023

Authors

Pérez Velilla, Eduardo

Rato, Sergio

Loaisa, Gema

Cabañas Poveda, Albertina

Publisher

Elsevier

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URI

https://hdl.handle.net/20.500.14352/92369

Citation

Pérez, E.; Rato, S.; Loaisa, G.; Cabañas, A. Phase equilibria for the mixtures of the deep eutectic solvent L-menthol + thymol plus CO2 at high pressure. Journal of Industrial and Engineering Chemistry 2023, 121, 312-321 DOI:10.1016/j.jiec.2023.01.034.

Abstract

The Vapour-Liquid Equilibrium (VLE) of different mixtures of CO2 + L-menthol, CO2 + thymol and CO2 + L-menthol + thymol has been determined at 35, 40, 50 and 60 °C and pressures up to 220 bar using a variable volume view cell. Menthol + Thymol form a deep eutectic solvent (DES) mixture at a 1:1 molar ratio. For selected conditions, the composition of the vapour phase was determined by 1H NMR. By interpolation of the experimental values, ternary diagrams were built. The mutual solubility between CO2 and DES decreased as the proportion menthol:thymol approached the eutectic composition (1:1). Mutual miscibility also decreased with temperature and increased with pressure. The composition of the mixture of menthol + thymol (1:1) does not remain stable at 60 °C but it does at lower temperatures. The intermolecular interactions between menthol and thymol are responsible for this behaviour. The Peng-Robinson equation of state was used to correlate the results with promising results.