Non-Newtonian shear-thinning viscosity of carbon monoxide-selective ionic liquid 1-hexyl-3-methylimidazolium chloride doped with CuCl

Abstract: The rheological properties of the ionic liquid 1-hexyl-3-methylimidazolium chloride ([hmim][Cl]) along with that of its mixtures with CuCl, which form the corresponding chlorocuprate(I)-based ionic liquids ([hmim][Cu(Cl)x]) are reported. In addition, the flow behaviour of these ionic liquids is thoroughly described for the first time. In previous works we have reported that these Lewis-acid-based ionic liquids exhibit high chemisorption capacity towards carbon monoxide which can be employed to design novel ionic liquid-based CO separation processes. Therefore, accurate knowledge of the transport properties is of utmost importance given the considerable influence of viscosity on mass transfer. Results showed that both [hmim][Cl] and [hmim][Cu(Cl)x] ionic liquids exhibited shear-thinning non-Newtonian behaviour associated to the presence of a hydrogen-bonding network. However, the onset of shear-thinning progressively shifted to higher frequencies upon increasing temperature for all measured samples. Moreover, a drastic [hmim][Cl] viscosity decrease from 14.2 to 3.98 Pa s was observed after addition of 2 mol CuCl L-1 at 293 K. In addition, the parameters of Cross model that describes shear-dependant viscosity have also been obtained.

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 Autoría: Zarca G., Fernández M., Santamaría A., Ortiz I., Urtiaga A.,

 Fuente: Separation and Purification Technology, 2015, Volume 155, 96–100

Editorial: Elsevier

 Fecha de publicación: 01/11/2015

Nº de páginas: 5

Tipo de publicación: Artículo de Revista

DOI: 10.1016/j.seppur.2015.07.032

ISSN: 1383-5866,1873-3794

Proyecto español: ENE2010-15585 ; CTQ2012-3139

Url de la publicación: https://doi.org/10.1016/j.seppur.2015.07.032