Experimental Evidence for Azeotrope Formation from Protic Ionic Liquids.
Chemphyschem
; 19(18): 2364-2369, 2018 09 18.
Article
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| MEDLINE
| ID: mdl-29799151
ABSTRACT
Herein, we present experimental evidence that protic ionic liquids (PILs), derived from 1 1 liquid mixtures of the organic superbases 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) with carboxylic acids, form azeotropic mixtures with acid/base molar fractions different from 1 1. The ability of the carboxylic acids to form strong hydrogen bonds with the PIL ion pair leads to an azeotropic composition richer in the acid component. The results show that the azeotropic composition is ruled by the extent of acid-base equilibrium and the relative volatility of the neutral species in the PIL medium. The PILs show marked negative deviations from Raoult's Law with the stronger superbase (DBU) leading to an azeotropic composition closer to the equimolar 1 1 ratio.
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1
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Chemphyschem
Asunto de la revista:
BIOFISICA
/
QUIMICA
Año:
2018
Tipo del documento:
Article
País de afiliación:
Portugal