Document type
Conference papers
Document subtype
Abstract
Title
Thermophysical Properties of Choline Acetate + Water Mixtures
Participants in the publication
A.L.C. Silva (Author)
Carla S.G.P. Queirós (Author)
Dep. Química e Bioquímica
CQE
Ana F. Cristino (Author)
Dep. Química e Bioquímica
CQE
Xavier Paredes (Author)
Dep. Química e Bioquímica
Carlos A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
Fernando J.V. Santos (Author)
Dep. Química e Bioquímica
CQE
Summary
The growing awareness on the effects of climate change, along with the increase in energy consumption worldwide, makes it urgent to find renewable energy alternatives and improve and develop more efficient equipment, since the majority of the energy produced is generated from burning fossil fuels [1,2]. In the case of absorption refrigeration, ionic liquids (ILs) were proposed as alternative absorbents due to their unique properties such as low flammability, negligible vapor pressure, high chemical and thermal stabilities and easy recycling. In recent studies, the most common ILs (imidazolium and pyridinium based) presented high toxicity and nonbiodegradability [3] although choline based ILs show that can be a less toxic and biodegradable alternative to common ILs [4,5].\n\nIn this work, the thermophysical properties of the binary system water and choline acetate [Cho][OAc] with an assay ≥ 95%, have been measured to analyze its possible use as working mixtures for absorption refrigeration. The thermophysical properties studied are density, speed of sound, viscosity, electrical conductivity and refractive index (and derived excess properties), for temperatures between 283 to 353 K.\n\n[1] M.S. Fernandes, G.J.V.N. Brites, J.J. Costa, A.R. Gaspar, V.A.F. Costa, “Review and future trends of solar adsorption refrigeration systems”, Renewable and Sustainable Energy Reviews, 39 (2014) 102–123. \n[2] I. Horuz, B. Kurt, “Absorption heat transformers and an industrial application”, Renewable Energy, 35 (2010) 2175–2181.\n[3] D. Coleman, N. Gathergood, “Biodegradation studies of ionic liquids”, Chemical Society Reviews, 39 (2010) 600-637.\n[4] S. P. F. Costa, P. C. A. G. Pinto, R. A. S. Lapa, M. L. M. F. S. Saraiva, “Toxicity assessment of ionic liquids with Vibrio fischeri: An alternative fully automated methodology”, Journal of Hazardous Materials, 284 (2015), 136–142.\n[5] M. Sakamoto, Y. Ohama, S. Aoki, K. Fukushi, T. Mori, Y. Yoshimura, A. Shimizu, “Effect of Ionic Liquids on the Hatching of Artemia Salina Cysts”, Australian Journal of Chemistry, 71 (2018), 492.
Editor(s)
NIST
Date of Publication
2021-06-20
Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Event
21st Symposium on Thermophysical Properties, Boulder, CO, USA
Publication Identifiers
Address
online (COVID19)
Organizers
NIST