화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.14, No.2, 219-223, March, 2008
DOI10.1016/j.jiec.2007.09.006  Export Citation
Liquid-liquid equilibrium correlations using lattice fluid equation of state with hydrogen bonding
Alexander Breitholz, Ki-Pung Yoo, Jong Sung Lim, Chul Soo Lee1, and Jeong Won Kang1, †
  • Department of Chemical and Biomolecular Engineering, Sogang University, Sinsu-Dong, Mapo-Gu, 121-742 Seoul, Korea
  • 1Department of Chemical and Biological Engineering, Korea University, 5-Ga Anam-dong, Sungbuk-Gu, 136-701 Seoul, Korea
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The nonrandom lattice equation of state with hydrogen bonding (NLF-HB EOS) was examined for the correlation of liquid-liquid equilibria (LLE) for binary alcohol and hydrocarbon mixture in a wide pressure range. For hydrocarbon + alcohol mixtures the consideration of a hydrogen-bonding term in the lattice equation of state clearly improves the prediction for vapor-liquid equilibrium (VLE) as shown in previous works, but the prediction of LLE is still in question. In this paper, LLE data for alcohols (methanol and ethanol) + hydrocarbons (n-hexane to n-hexadecane) were correlated by NLF-HB EOS and results were compared with a cubic equation of state (Peng-Robinson EOS with the T-K Wilson based G E model). Both equations of state showed similar degree of accuracies but with different number of adjustable parameters. The Peng-Robinson EOS based approach requires six temperature dependent coefficients for accurate calculation whereas NLF-HB EOS requires only two temperature dependent coefficients. The effects of varying hydrogen-bonding energies for NLF-HB EOS are discussed. (C) 2008 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Keywords:liquid-liquid equilibrium;correlation;lattice fluid;equation of state;hydrogen bonding;alcohols;hydrocarbons
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