resumo
The alkanolammonium ILs are protic ionic liquids (PILs) with huge potential in a variety of industrial fields. Among other advantages, these PILs have low cost of preparation, simple synthesis and purification methodologies and low toxicity. This study aims at obtaining significant data on the fundamental thermophysical properties of hydroxyethylammonium-based PILs with carboxylate anions. The density was measured within the temperature and pressure intervals (298.15-343.15) K and (0.1-35.0) MPa for 2-hydroxyethylammonium propionate, [2-HEA][Pr]. The speed of sound was determined in the ranges (303.15-353.15) K and (0.1-20.0) MPa for the same substance. The estimated combined standard uncertainties are +/- 0.45 kg.m (3) for density and +/- 1.6 m.s(-1) for speed of sound. The experimental pVT data were fitted using the Goharshadi-Morsali-Abbaspour equation of state (GMA EoS) with average relative absolute deviation (%AARD) of 0.03%. Thermomechanical coefficients as the thermal expansivity, isothermal compressibility, and internal pressure, were calculated using GMA EoS with the internal pressure being further compared with calculated values of cohesive energy density. The experimental pVT data were further successfully described by the predictive methods of Gardas and Coutinho and Paduszynki and Domanska. (C) 2018 Elsevier Ltd.
palavras-chave
COHESIVE ENERGY DENSITY; EQUATION-OF-STATE; INTERNAL-PRESSURE; KNOEVENAGEL CONDENSATION; TRIETHANOLAMINE STEARATE; THERMODYNAMIC PROPERTIES; ACOUSTICAL PROPERTIES; ALDOL CONDENSATIONS; ETHANOLAMINE OLEATE; PHYSICAL-PROPERTIES
categoria
Thermodynamics; Chemistry
autores
Sarabando, JA; Magano, PJM; Ferreira, AGM; Santos, JB; Carvalho, PJ; Mattedi, S; Fonseca, IMA
nossos autores
Pedro J. Carvalho
Professor AuxiliarProjectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Projeto de Investigação Exploratória: Pedro Carvalho (IF/00758/2015)
agradecimentos
This work was developed in the scope of the project CICECO Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement. P. J. Carvalho acknowledges FCT for a contract under the Investigador FCT 2015, contract number IF/00758/2015. S. Mattedi acknowledges the finantial support from CNPq (grant No 306640/2016-3).