Melting point depression effect with CO2 in high melting temperature cellulose dissolving ionic liquids. Modeling with group contribution equation of state

JOANA M LOPES; FRANCISCO ADRIÁN SÁNCHEZ; SABRINA BELÉN RODRIGUEZ REARTES; MARÍA DOLORES BERMEJO; ÁNGEL MARTÍN; MARÍA JOSÉ COCERO

JOURNAL OF SUPERCRITICAL FLUIDS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 107 p. 590 - 604

0896-8446

TRABAJO DESARROLLADO, ENVIADO Y ACEPTADO DURANTE EL AÑO 2015 (enviado en abril de 2015, aceptado en julio de 2015, tal como figura en la historia del artículo - ver adjunto en Sigeva -).Ionic liquids of the alkylmethylimidazolium chloride family are able to solubilize high amounts of cellulose and other natural polymers and have very good characteristics for their processing. Nevertheless, they present important disadvantages related to their high melting points and viscosities. Dissolution of carbon dioxide (CO2) can reduce the melting point of these ionic liquids. In this work, the effect of pressurized carbon dioxide on the melting point depression of some ionic liquids able to dissolve biopolymers was experi-mentally determined using the first melting point method. Five different ionic liquids were studied using a high-pressure visual cell, up to a pressure of 10 MPa. The ILs studied were four ionic liquids with chloride anion coupled with 1-butyl-3-methylimidazolium cations: [C4mim]+, 1-ethyl-3-methylimidazolium, [C2mim]+, 1-allyl-3-methylimidazolium, [Amim]+ and 1-(2-hydroxyethyl)-3-methylimidazolium, [C2OHmim]+ and one ammonium-based cation choline [C5H14NO]+ combined with dihydrogen phosphate anion, [H2PO4]-. Melting point depression effect observed for these groups of ionic liquids were around 10 K for chloride ILs and went as high as 33.2 K for choline dihydrogen phosphate. To correlate the melting point depression of imidazolium chloride ILs, parameters for the Group Contribution Equation of State (GC-EoS) of Skjold-Jørgensen for the liquid phase plus a fugacity expression for solid phases was employed. Experimental data used for the parameterization includes literature data of binary vapor-liquid, liquid-liquid and solid-liquid equilibria, and activity coefficients at infinite dilution. Melting point depression was calculated with an average deviation of 1.7 K (0.5%) and a maximum deviation of 4.3 K (1.3%).