Effect of Pressurized Carbon Dioxide on Mutual Miscibility Temperatures for Methanol + Hydrocarbon Binary Liquid Mixtures

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  • Saito Tohru
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Iwai Yoshio
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Arai Yasuhiko
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Nakadai Futoshi
    Department of Material and Applied Chemistry, Nihon University
  • Taniguchi Daisuke
    Department of Material and Applied Chemistry, Nihon University
  • Ochi Kenji
    Department of Material and Applied Chemistry, Nihon University
  • Furuya Takeshi
    Nanotechnolgy Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

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Abstract

An apparatus has been developed for the measurement of mutual miscibility temperatures of binary liquid mixtures coexisting with a high pressure gas to examine to what extent the phase behavior changes. Methanol + hydrocarbon (cyclohexane, hexane, octane, and decane) binary mixtures were selected as typical polar and non-polar mixtures. And their mutual miscibility temperatures were measured at temperatures from 275.4 to 363.9 K and pressures up to 2.2 MPa with pressurized carbon dioxide (CO2). The experimental results were correlated with the NRTL equation by adopting a pseudo-binary mixture treatment. The NRTL interaction parameters between methanol and hydrocarbons were assumed to vary due to the presence of CO2. A good agreement between the experimental and the correlated mutual miscibility temperatures is obtained.

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