Isobutane as a probe of the structure of 1-alkyl-3-methylimidazolium bistrifluoromethylsulfonylimide ionic liquidsReport as inadecuate




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An experimental study of the solubility and of the thermodynamic properties of solvation, between temperatures 303 and 343 K and at pressures close to atmospheric, of 2-methylpropane isobutane in several ionic liquids based on the bistrifluoromethylsulfonylimide anion and on 1-alkyl-3-methylimidazolium cations, CnC1ImNTf2, with alkyl side-chains varying from two to ten carbon atoms is presented. The isobutane solubility increases with increasing size of the alkyl side-chain of the cation in the ionic liquid and decreases with increasing temperature as typical of an exothermal dissolution process. The mole fraction solubility of isobutane varies from 0.904 . 10-2 in C2C1ImNTf2 at T = 343 K to 1.002 . 10-1 in C10C1ImNTf2 at T = 303 K. The values measured in this work are compared to the behaviour of n-butane in the same ionic liquids published in a previous study Costa Gomes et al., 2012. Isobutane was found to be significantly less soluble than n-butane in all the ionic liquids. The differences found are interpreted in relation to the molecular structures obtained by molecular dynamics simulations for the solutions of n-butane and isobutane in the studied CnC1ImNTf2 ionic liquids.Nota general

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Author: Pison, Laure; - Bernales, Varinia; - Fuentealba Rosas, Patricio; - Padua, Agilio A.H.; - Costa Gomes, Margarida; -

Source: http://repositorio.uchile.cl/



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