abstract
Among new potential solvents for lignocellulosic materials, ionic liquids (ILs) are attracting considerable attention. Hence, the knowledge of the thermophysical properties of such fluids is essential for the design of related industrial processes. Therefore, in this work, a set of thermophysical properties, namely, density, viscosity, and refractive index, as a function of temperature, and isobaric thermal expansivity and heat capacities at a constant temperature, were determined for eight ionic liquids with the 1-ethyl-3-methylimidazolium cation combined with the following anions: acetate, methylphosphonate, methanesulfonate, trifluoromethanesulfonate, dicyanamide, thiocyanate, tosylate, and dimethylphosphate. Imidazolium-based HA were chosen since these are the most studied ionic fluids in biomass dissolution approaches, while a large array of anions was investigated because it was already demonstrated that it is the IL anion that mainly governs the dissolution.
keywords
HEAT-CAPACITIES; COMPOSITION DEPENDENCE; ATMOSPHERIC-PRESSURE; BINARY-MIXTURES; SMALL SAMPLES; CELLULOSE; WATER; TEMPERATURE; DISSOLUTION; DENSITY
subject category
Thermodynamics; Chemistry; Engineering
authors
Freire, MG; Teles, ARR; Rocha, MAA; Schroder, B; Neves, CMSS; Carvalho, PJ; Evtuguin, DV; Santos, LMNBF; Coutinho, JAP
our authors
Ana Rita Ribeiro Teles
Financial Officer
Bernd Schroder
Post-doc Fellowship
Catarina Maia Seco Seiça Neves
Junior Researcher
Dmitry Evtyugin
Associate Professor with Aggregation
Mara Guadalupe Freire Martins
Research Coordinator
Pedro J. Carvalho
Assistant Professoracknowledgements
This work was funded by project QREN SI-I&DT Project No. 11551 from UE/FEDER through the COMPETE program. The authors also thank Fundacao para a Ciencia e a Tecnologia for the postdoctoral Grants SFRH/BPD/41781/2007 and SFRH/BPD/38637/2007 from M.G.F. and B.S., respectively, and Ph.D. Grants SFRH/BD/60513/2009, SFRH/BD/70641/2010, and SFRH/BD/41562/2007 from M.A.A.R., C.M.S.S.N., and PJ.C., respectively.