Liquid-liquid equilibrium of rosemary model essential oil (α-pinene + eucalyptol + camphor) and solvent (ethanol + water) at room conditions
| Autor: | Cíntia Bernardo Gonçalves, Camila Panzarin, Christianne Elisabete da Costa Rodrigues, Daniel Gonçalves |
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| Rok vydání: | 2020 |
| Předmět: |
SOLVENTE
010405 organic chemistry General Chemical Engineering General Physics and Astronomy 02 engineering and technology 01 natural sciences 0104 chemical sciences law.invention Surface tension Solvent chemistry.chemical_compound Camphor Viscosity Eucalyptol 020401 chemical engineering chemistry Chemical engineering law Phase (matter) Non-random two-liquid model 0204 chemical engineering Physical and Theoretical Chemistry Essential oil |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Rosemary essential oil is composed of key components used in pharmaceutical and cosmetics products worldwide. Among several components found in rosemary essential oil, it can be simplified by a mixture of α-pinene, eucalyptol, and camphor. Aiming an enhanced product quality, the separation of eucalyptol and camphor from α-pinene was evaluated employing ethanol + water mixtures as solvents. For that, liquid-liquid equilibrium data of systems composed of α-pinene + eucalyptol + camphor + ethanol + water at T = (298.2 ± 0.1) K were thus assessed. Thermophysical properties of the phases from the equilibrium as density, viscosity, surface tension, and interfacial tension were also evaluated. Increased water amount in the solvent caused decreased distribution coefficients, but higher solvent selectivity and thermophysical properties. Increased oxygenated compounds in the terpene phase also led to enhanced density and viscosity values, but lower solvent selectivity and interfacial tension. Binary interaction parameters of the NRTL adjusted to the experimental data and empirical equations described satisfactorily the phases compositions and thermophysical properties, with relative deviations of 0.73% for NRTL, 0.006% for density, 0.22% for viscosity, 5.78% for surface tension, and 5.88% for interfacial tension. |
| Databáze: | OpenAIRE |
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