Distillation of a Binary Mixture in the Centrifugal Molecular Still

  • Adnan Murad

    Student thesis: Doctoral Thesis


    This thesis describes an investigation of the transport phenomena of a binary mixture over a rotating disk and under conditions of molecular distillation. These phenomena were studied using a modified version of the commercially designed centrifugal molecular still, CMS-5.

    A mathematical model was developed which relates the equations of maximum evaporation rate, heat and mass transfer of the transport behaviour of fluid on a rotating disk to such parameters as mass flow rate, composition, film thickness, mean velocity, Reynolds number, surface temperature, and relative volatility.

    Numerical techniques have been used in solving the model, and from the computed and the experimentally measured values, it was possible to evaluate the performance of the still in terms of the theoretical molecular plate.

    The mathematical model is also capable of predicting the mean distillation rate and composition of distillate. Reasonable agreement was obtained between the measured and calculated values.

    In order to solve the mathematical model, it was also necessary to evaluate experimentally some physical property data of the binary mixture.

    Mean rates of distillation and compositions of distillate of the binary mixture (di-2-ethylhexyl phthalate - di-2-ethylhexyl sebacate) were measured for a set of feed compositions over a range of temperatures and feed rates. The overall performance of the centrifugal still and the binary mixture were evaluated.
    Date of AwardJun 1982
    Original languageEnglish
    Awarding Institution
    • Polytechnic of Wales

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