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SAFT Equation of State for Vapor-liquid Phase Equilibria of Associating Fluid Mixtures

SAFT 상태 방정식과 회합성 유체 혼합물의 기액 상평형

  • Chang, Jaeeon (Department of Chemical Engineering, University of Seoul)
  • 장재언 (서울시립대학교 화학공학과)
  • Received : 2018.07.16
  • Accepted : 2018.09.12
  • Published : 2018.10.01

Abstract

We review SAFT equation of state (EOS) which is based on TPT theory and statistical-mechanical principles, and confirm that it can be used as a useful tool to predict vapor-liquid phase equilibria of associating fluid mixtures. We examine theoretical structure of PC-SAFT EOS in great detail, and then assess the applicability and performance of the EOS while applying it to various mixtures containing nonpolar components, polar components and associating components in a stage-wise manner. In contrast to the conventional engineering EOS, PC-SAFT EOS can accurately predict nonideal behaviors of those mixtures without using semi-empirical binary interaction parameter. This is because the SAFT theory is based on a rigorous theoretical framework at molecular level which effectively accounts for various intermolecular interactions, and it thus provides substantial benefits in applying the SAFT EOS to complex thermodynamic phenomena of multi-component mixtures.

Keywords

SAFT;PC-SAFT;TPT;Equation of state;Association;VLE

Acknowledgement

Supported by : 서울시립대학교

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