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In relation to this article, we declare that there is no conflict of interest.
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Received August 29, 2008
Accepted November 17, 2008
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Measurement of excess enthalpies using a high-pressure flow microcalorimeter and determination of binary interaction parameters for thermodynamic models

Department of Applied Chemical Engineering, Korea University of Technology and Education, 307 Gajeon-ri, Byeongcheon-myeon, Cheonan-city 330-708, Korea 1Department of Chemical System Engineering, Hongik University, Jochiwon-up, Yongi-gun 339-701, Korea
Korean Journal of Chemical Engineering, January 2009, 26(1), 220-224(5), 10.1007/s11814-009-0036-7
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Abstract

While an equation of state (EOS) plays a critical role in estimating thermodynamic properties, employing it in the determination of binary interaction parameters is extremely important. In general, these parameters can be determined from phase equilibrium data. However, data collection from experiments is a time-consuming and tedious process. In this study, after measuring the excess enthalpies of binary systems containing CO2 by high-pressure flow_x000D_ isothermal microcalorimetry (IMC), we determined the EOS binary interaction parameters, specifically, the Peng-Robinson EOS binary interaction parameters. These binary interaction parameters obtained by IMC were compared with those obtained by vapor-liquid equilibrium (VLE) experiments. Hence, high-pressure flow IMC appears to be an effective method for the determination of interaction parameters that are used in the estimation of thermodynamic properties. Further, the Flory-Huggins interaction parameters of a binary mixture CO2 containing with various mole compositions were also estimated by employing high-pressure IMC.

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