Name: Dr. Eleni C. Panteli
Tel:  +30 210 772 32 30
Address: Heroon Polytechniou 9, 157 80 Zographou, Athens, GREECE
epanteli@chemeng.ntua.gr



Diploma, Chemical Engineering, National Technical University of Athens, Greece, 2004.

Ph.D., Chemical Engineering, National Technical University of Athens, Greece, 2010.

  Research Assistant, National Technical University of Athens, 2011-today.



Full CV


 
Research Activities
Experimental solubility measurements of antioxidant compounds in ionic liquids (ILs), organic solvents (OS) & mixtures of ILs/OS


Antioxidants are a class of compounds widely used in several applications, mainly encountered in the food and drug industry, due to their ability to retard the rate of oxidation in autoxidizable materials.

Organic solvents occupy most of the solvent market in industry but their volatile nature participates in the atmospheric pollution. Ionic Liquids on the other hand, a relatively new class of compounds, are salts in which the ions are poorly coordinated, resulting in their liquid nature around room, or even lower, temperature. Some of their advantageous properties, especially in comparison to the classical organic solvents, is their negligible vapour pressures, non flammability, stability up to high temperatures, high solvating power for both polar and non-polar compounds etc. One of their most important characteristic though is that it is possible to tune their properties, such as density, viscosity, etc., in order to meet a specific application by simply selecting the appropriate anion and cation (designer solvents).

The scope of the specific project is:
a) to study the solvating capacity of ILs for various antioxidant compounds and to compare it with the corresponding one of classic organic solvents. Moreover, the adjustment of the solvating capacity by using mixtures of ILs and organic solvents is examined.
b) Application of classical thermodynamic models, like NRTL and UNIQUAC, and more advance tools, like the COSMO-RS which is a quantum chemical calculation tool, in mixtures containig antioxidants, ILs and organic ssolvents.
c) Extension of the UNIFAC method, which is a semi-empirical group contribution model developed for non-electrolyte solutions, to mixtures containing ILs.


More information and detailed results can be found in:

- E.K. Panteli, E.K. Voutsas, "Solubilities of Cinnamic Acid Esters in Ionic Liquids", J. Chem. Eng. Data, 54/3 (2009) 812.
- E. Alevizou, G. Pappa, E. Voutsas, "Prediction of phase equilibrium in mixtures containing ionic liquids using UNIFAC", Fluid Phase Equil., 284/2 (2009) 99.
- E. Panteli, P. Saratsioti, H. Stamatis, E. Voutsas, "Solubilities of Cinnamic Acid Esters in Organic Solvents", J. Chem. Eng. Data, 55 (2010) 745.
- E. Panteli, E. Voutsas, "Solubilities of Cinnamic Acid Esters in Binary Mixtures of Ionic Liquids and Organic Solvents", Fluid Phase Equilib. 295 (2010) 201.

Phase equilibrium of natural gas mixtures (The project is financially supported by STATOIL, Norway)


The knowledge of the hydrocarbon dew point is of great importance for the oil & gas industry as it is one of the gas quality specifications used for ensuring safe transport of natural gas. Avoiding hydrocarbon condensation is crucial as the presence of liquids in the pipelines increases the pressure drop and introduces operational problems resulting from the two phase flow in pipelines designed for single phase transportation. Thus, accurate prediction of hydrocarbon dew point temperatures and pressures are of great importance to obtain a safe and effective utilization of the natural gas pipelines.

Cubic equations of state (EoS), such as the Peng-Robinson (PR) and Soave-Redlich-Kwong, coupled with the classical van der Waals mixing rules, are routinely used by the oil and gas industry for the design of recovery and processing operations of natural gases.

Previous studies have pointed out that currently all thermodynamic models have difficulty in representing correctly the whole phase envelope with both the cricondentherm and the cricondenbar.

In the framework of this project the performance of the UMR-PRU model that has been developed in our laboratory is tested in the prediction of experimental dew point data of synthetic and real natural gases.

The Universal Mixing Rule (UMR) is a mixing rule for cubic equations of state (CEoS) applicable to all type of system asymmetries. For the cohesion parameter of the CEoS the mixing rule involves the Staverman-Guggenheim part of the combinatorial term and the residual term of the original UNIFAC Gibbs free energy expression. For the co-volume parameter of the CEoS the quadratic concentration dependent mixing rule is used with the combining rule for the cross parameter. The UMR is applied to the Peng-Robinson equation of state leading to what is referred to as the UMR-PRU model. Very satisfactory results are obtained using the existing interaction parameters of the Original UNIFAC model for fluid phase equilibrium predictions at low and high pressures for a wide range of system asymmetries including mixtures containing polymers.

More information and detailed results can be found in:

- E. Voutsas, K. Magoulas and D. Tassios, Ind. Eng. Chem. Res., (2004), 43, 6238-6246.
- E. Voutsas, V. Louli, C. Boukouvalas, K. Magoulas and D. Tassios, Fluid Phase Equil., (2006), 241, 216-228.
- V. Louli, C. Boukouvalas, E. Voutsas, K. Magoulas and D. Tassios, Fluid Phase Equil., (2007), 261, 351-358.