ILThermo:  A Free-Access Web Database for Thermodynamic Properties of Ionic Liquids

Ionic Liquids: Theory, Properties, New Approaches, 2011

Pure and Applied Chemistry, 2000

ACS Symposium Series, 2017

Twenty years ago, research involving ionic liquids was a minor field of interest. Only a few chemists and even fewer engineers were interested in salts with melting points near room temperature. In April 2000, the first NATO advanced research workshop on ionic liquids was held in Heraklion, Crete. The conference was the first international meeting devoted to ionic liquids and attracted most of the active researchers at that time. Following that meeting, activity in the field began to flourish and the first books and international conferences devoted to ionic liquids began to appear. Today, over 75,000 publications and 12,000 patents have been published involving ionic liquids! This symposium series book based on the ACS conference, Ionic Liquids: Current State and Future Directions held in San Diego, California in 2016 attempts to propel the field forward by bringing together contributions from some of the foremost researchers on ionic liquids. Recent products and new largescale processes using ionic liquids, both in operation and being announced, indicate that an exciting new chapter in this field is about to begin. This introductory chapter summarizes some of the history, applications, conferences, books, databases, issues related to data quality and toxicity for researchers working in the field of ionic liquids and includes an overview for each proceeding chapter with an introduction about the authors.

RSC Advances, 2012

While the design of products and processes involving ionic liquids (ILs) requires knowledge of the thermophysical properties for these compounds, the massive number of possible distinct ILs precludes their detailed experimental characterization. To overcome this limitation, chemists and engineers must rely on predictive models that are able to generate reliable values for these properties, from the knowledge of the structure of the IL. A large body of literature was developed in the last decade for this purpose, aiming at developing predictive models for thermophysical and transport properties of ILs. A critical review of those models is reported here. The modelling approaches are discussed and suggestions relative to the current best methodologies for the prediction of each property are presented. Since most of the these works date from the last 5 years, this field can still be considered to be in its infancy. Consequently, this work also aims at highlighting major gaps in both existing data and modelling approaches, identifying unbeaten tracks and promising paths for further development in this area.

Fluid Phase Equilibria, 2013

Ionic liquids, owing to their unique characteristics grasp many researchers' attention in both academia and industrial fields. In this communication, the attention is focused on the heat capacity of ionic liquids, as one of the most basic and important thermophysical properties. The simple 5-term temperature dependent correlation based on basic molecular parameters is presented to predict heat capacities of ILs. A total data set of 2940 experimental data belonging to 56 ionic liquids was used to develop a general correlation. The global absolute average deviation of the model results from experimental values is 2.5%. The proposed model could be safely applied for thermodynamic and industrial applications.

Room temperature ionic liquids (RTILs) are organic salts, liquids at room temperature in their neat state. Due to their interesting properties such as negligible vapour pressure, suitable viscosity, and high solvent power for both polar and nonpolar organic and inorganic substances, they represent a class of materials whose employment in several applications is considered as a green alternative to toxic chemicals. Despite their interest, a deep knowledge of thermophysical properties of liquid mixtures containing RTILs, which is important for the design of any technological processes, has not yet fully accomplished by the scientific community. 1-3 In this work we report the experimental measurements of H E and V E of different RTILs (1) (ethylammonium formate, EAF; etylammonium propionate, EAP; and etylammonium butyrate, EAB) + water (2) with the aim to evaluate the effect of the kind of the anion and in particular the effect of alkyl chain length on some thermodynamic properties of ...

Journal of Solution Chemistry, 2015

One may ask what is the reason for this special issue of the Journal of Solution Chemistry being dedicated both to the fashionable topic of ionic liquids and to the memory of Prof. Eduard Hála. A prominent personality and internationally renowned thermodynamicist, Prof. Hála is the author of more than 50 original papers and, more importantly, of two seminal and timeless monographs [1, 2]. In the early 1960s, while he was still a young pedagogue at the Institute of Chemical Technology Prague, he wrote with his faculty colleague and longtime friend Arnost Reiser the first modern Czech textbook of physical chemistry that was inspired by similar university textbooks published in English. Later, he summarized his deep knowledge in a book entitled Vapor-Liquid Equilibria, which is commonly called ''a chemical engineer's cookbook''. Shortly after its publication in Czech, Vapor-Liquid Equilibria was translated into English and published by Pergamon Press. Since then this publication has become compulsory reading material of every thermodynamicist and engineer dealing with distillation processes. Prof. Hála was also among the first in Czechoslovakia to have grasped the importance of computer programming in science and later of the increasing significance of statistical thermodynamics. As an outstanding university educator and co-founder with Prof. Reiser of the so-called Prague School of Physical Chemistry, Prof. Hála is therefore worth remembering time and time again. Prof. Hála passed away in 1989 and even though ionic liquids were already a known class of compounds at that time, a pronounced interest in their properties and applications only started to show itself in the early 1990s. However, Prof. Hála was known throughout

Accounts of chemical …, 2007

2010

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Journal of Chemical & Engineering Data, 2009

It has been proved in the past, with common liquids, that the values of their thermophysical properties have a significant effect on the design of physicochemical processing and reaction units, influencing directly the design parameters and performance of equipment like heat exchangers, distillation columns, and reactors. In this paper we have analyzed the effect of the uncertainty of thermophysical data of ionic liquids (density, heat capacity, thermal conductivity, and viscosity) in the design of some current equipment, used in processes as solvents or heat transfer fluids. Data have been collected from the IL Thermo database for alkylmethylimidazolium (C n mim) liquids, with [BF 4 ] and [PF 6 ] anions. Results obtained show that the influence of actual errors in the thermophysical properties of ionic liquids can render any future design as not working or excessively costing. Moreover, the heat storage capacity of these ionic liquids has been analyzed, and it is possible to consider them as possible replacements of current silicon-based heat transfer fluids. The results obtained support that the implementation of those applications needs a careful selection of experimental data, otherwise equipment will be either under-or overdimensioned, with the consequent ill operation or increased capital costs. In addition, they recommend a revision of the present methods of measurement of thermophysical properties of ionic liquids and the establishment of reference data on thermophysical properties with low uncertainty, to avoid the actual status of experimental data.

Pure and Applied Chemistry, 2000

This report presents the systematic study on the solubilities of 1-alkyl-3-methylimidazolium hexafluorophosphate [e, or bmim][PFThe data were correlated by means of the UNIQUAC and modified nonrandom two-liquid (NRTL) equations utilizing parameters derived from the solid–liquid equilibrium (SLE). The root-mean-square deviations of the solubility temperatures for all calculated data depend on the particular system and the equation used.The solubilities of [C

Thermochimica Acta, 2005

Large-scale solar energy collectors intended for electric power generation require a heat-transfer fluid with a set of properties not fully met by currently available commercial materials. Ionic liquids have thermophysical and chemical properties that may be suitable for heat transfer and ...

Journal of Chemical & Engineering Data, 2008

The density of ionic liquids (ILs) as a function of pressure and temperature has been modeled using a group contribution model. This model extends the calculations previously reported (Jacquemin et al. J. Chem. Eng. Data 2008) which used 4000 IL densities at 298.15 K and 600 IL densities as a function of temperature up to 423 K at 0.1 MPa to pressures up to 207 MPa by using described data in the literature and presented in this study. The densities of two different ionic liquids (butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [N 1114 ][NTf 2 ], and 1-butyl-1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl)imide, [C 4 mPyrro]-[NTf 2 ]) were measured as a function of temperature from (293 to 415) K and over an extended pressure range from (0.1 to 40) MPa using a vibrating-tube densimeter. The model is able to predict the ionic liquid densities of over 5080 experimental data points to within 0.36 %. In addition, this methodology allows the calculation of the mechanical coefficients using the calculated density as a function of temperature and pressure with an estimated uncertainty of ( 20 %.