RT Dissertation/Thesis
T1 Phase Equilibria for extraction processes with designer solvents
A1 Lago García de Dios, Sara
A2 E.T.S. de Enxeñaría. Departamento de Enxeñaría Química, 
K1 Extraction
K1 Equilibrium
K1 Designer solvents
AB In recent years, there has been an increasing concern about the effectsof toxic chemicals in the environment. In response to this concern,there is a growing impetus to develop chemical manufacturingprocesses which can reduce or eliminate the use or generation ofhazardous substances. Within this aspect of green chemistry, in thisThesis, Ionic Liquids (ILs) and Deep Eutectic Solvents (DESs) have beentested as greener alternatives in different chemical processes.In a first stage, the capability of using ILs as solvents for citrusessential oil deterpenation by liquid-liquid extraction was investigated.The liquid-liquid equilibria of ternary systems limonene + linalool + ILwere determined. Results were analysed in terms of the solutedistribution ratio and selectivity, allowing to draw conclusions aboutthe influence of the structure of the ILs in these thermodynamicparameters. Experimental data were correlated by means of the NRTLand UNIQUAC equations.To evaluate the capability of some ILs to act as surfactants inEnhanced Oil Recovery, two of these salts showing surfactant behaviourwere tested. Liquid-liquid equilibria of ternary systems water + IL + ndodecanewere determined. Winsor Type III systems were found, andthe interfacial tensions between phases were measured to prove theability of these salts to reduce the water – oil interfacial tension.Physical and transport properties of the phases involved, such asdensity and viscosity, were also experimentally measured.In a last stage, an introductory study on the processing oflignocellulosic biomass with DESs was carried out. Different renewableDESs were prepared from hydrogen bond donor and hydrogen bondacceptor starting materials. Solubility tests of pine wood and wheatstraw in these solvents were carried out.From the thermodynamic studies that were carried out in thisThesis, it turns out that designer solvents can be used to developgreener and/or more efficient chemical processes.
YR 2013
FD 2013-12-27
LK http://hdl.handle.net/10347/9570
UL http://hdl.handle.net/10347/9570
LA eng
DS Minerva
RD 4 may 2026