Influence of temperature and pressure on the density and speed of sound of N-ethyl-2-hydroxyethylammonium propionate ionic liquid

authors	Sarabando, JA; Magano, PJM; Ferreira, AGM; Santos, JB; Carvalho, PJ; Mattedi, S; Fonseca, IMA; Santos, M
nationality	International
journal	JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords	N-ethyl-2-hydroxyethylammonium propionate; Density; Speed of sound; GMA equation of state; Sun equation
keywords	THERMODYNAMIC PROPERTIES; ACOUSTICAL PROPERTIES; ETHANOLAMINE OLEATE; CATALYTIC-ACTIVITY; AQUEOUS MIXTURES; ACID
abstract	The alkanolammonium ILs are protic ionic liquids (PILs) with low cost of preparation, simple synthesis and purification methodologies and low toxicity. The knowledge of high-pressure density and speed of sound are fundamental properties either to understand the nature of molecular interactions, structure and packing effects or to determine other thermodynamic properties useful in chemical and industrial processes. Herein, the density, up to 35 MPa along isotherms ranging from (298.15 to 343.15) K, and the speed of sound up to 20 MPa, along isotherms in the range (303.15 to 353.15) K, are reported for the N-ethyl-2-hydroxyethylammonium propionate, [E2HEA][Pr] PIL. The experimental pVT data were further correlated with the Goharshadi-Morsali-Abbaspour equation of state (GMA EoS) with average absolute deviation (%AARD) of 0.03%. From GMA EoS the thermal expansivity and isothermal compressibility were determined. The speed of sound was correlated with Sun equation with %AARD = 0.08%. The isentropic and molar compressibilities were also calculated from the density and speed of sound. (C) 2018 Elsevier Ltd.
publisher	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn	0021-9614
isbn	1096-3626
year published	2019
volume	131
beginning page	303
ending page	313
digital object identifier (doi)	10.1016/j.jct.2018.11.005
web of science category	Thermodynamics; Chemistry, Physical
subject category	Thermodynamics; Chemistry
unique article identifier	WOS:000454515300031