Thermophysical characterization of N-methyl-2-hydroxyethylammonium carboxilate ionic liquids
authors Talavera-Prieto, NMC; Ferreira, AGM; Simoes, PN; Carvalho, PJ; Mattedi, S; Coutinho, JAP
nationality International
journal JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords Ionic liquids; Density; GMA equation of state; Heat capacity; Thermal stability
keywords ETHYLAMMONIUM NITRATE; PHYSICOCHEMICAL PROPERTIES; HEAT-CAPACITY; FUSED SALT; TRIETHANOLAMINE STEARATE; KNOEVENAGEL CONDENSATION; ETHANOLAMINE OLEATE; PHASE-BEHAVIOR; WIDE-RANGE; ACID SOAP
abstract The thermophysical properties including density, heat capacity, thermal stability and phase behaviour of protic ionic liquids based on the N-methyl-2-hydroxyethylammonium cation, [C2OHC1NH2](+), with the carboxylate anions (propionate, [C2COO] , butyrate, [C3COO] , and pentanoate, [C4COO] ) are reported and used to evaluate structure-property relationships. The density was measured over the temperature and pressure ranges, T = (298.15 to 358.15) K and p = (0.1 to 25) MPa, respectively, with an estimated uncertainty of +/- 0.5 kg . m(-3). The pressure dependency of the density for these ionic liquids (ILs) is here presented for the first time and was correlated using the Goharshadi-Morsali-Abbaspour (GMA) equation of state, from which the isothermal compressibility, thermal expansivity, thermal pressure, and internal pressure were calculated. The experimental PVT data of the protic ILs were predicted by the methods of Gardas and Coutinho (GC), and Paduszynki and Domanska (PD). The thermal stability was assessed by high resolution modulated thermogravimetric analysis within the range T = (303 to 873) K. The heat capacity was measured in the temperature range T = (286.15 to 335.15) K by modulated differential scanning calorimetry with an uncertainty in the range (1 to 5) J . K-1 . mol(-1). The Joback method for the prediction of ideal gas heat capacities was extended to the ILs and the corresponding states principle was employed to the subsequent calculation of liquid heat capacity based on critical properties predicted using the modified Lydersen-Joback-Reid method. The Valderrama's mass connectivity index method was also used for liquid heat capacity predictions. This series of N-methyl-2-hydroxyethylammonium was used to establish the effect of the anion alkyl chain length on the ionic liquid properties. (C) 2013 Elsevier Ltd. All rights reserved.
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn 0021-9614
year published 2014
volume 68
beginning page 221
ending page 234
digital object identifier (doi) 10.1016/j.jct.2013.09.010
web of science category Thermodynamics; Chemistry, Physical
subject category Thermodynamics; Chemistry
unique article identifier WOS:000326271100029
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 2.631
5 year journal impact factor 2.531
category normalized journal impact factor percentile 63.559
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg