Modified Ponchon-Savarit and McCabe-Thiele methods for distillation of two-phase feeds

Simon Bolívar University, Baruta, Miranda, Venezuela
Industrial & Engineering Chemistry Process Design and Development 04/1984; 23(1):1-6. DOI: 10.1021/i200024a001


Modified versions of the Ponchon-Savarit and McCabe-Thiele methods are presented which incorporate a correct analysis of the feed region in the case of partly vaporized feeds. The methods proposed are fully graphical, require no additional information or calculations, and do not complicate significantly the traditional procedures. It is shown that for optimal effect, the liquid and vapor parts are introduced to separate but contiguous stages. Numerical examples confirm that a small improvement in column performance is achieved, but the influence on the number of stages or reflux ratio required for a given separation is negligible, except in very special cases.

Download full-text


Available from: Claudio Olivera-Fuentes,
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A portable computer simulator has been developed to aid in the design of distillation columns with either an internal reboiler or an open steam. The program (PANCHN) uses the traditional Ponchon-Savarit method and a modified form which incorporates a more exact analysis of the feed region in the case of a partially vaporized feed. Examples of this simulation program and its computer graphics output are presented to illustrate the program's capability and usefulness in studying the effect of operating parameters in the design of distillation columns. While equilibrium data for some systems are stored in its data bank, the present simulator has the flexibility of reading equilibrium data for other systems, as well as overriding stored data.
    Computers & Education 01/1989; 13(3-13):305-312. DOI:10.1016/0360-1315(89)90028-6 · 2.56 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The heat-integrated distillation column, generally called HIDiC, applies the principle of internal heat integration between the rectifying section and the stripping section of a distillation column by increasing the temperature of the rectifying section with a compressor. In this work, a theoretical stage-to-stage study of a HIDiC based on the Ponchon−Savarit method is performed. Several HIDiC design variables, such as the number of theoretical stages, reboiler (or preheater) duty, minimum overall internal heat-transfer rate, and configuration, can easily be interpreted in the Ponchon−Savarit (Hxy) diagram. Such an approach brings new insights into and better understanding of the features of HIDiC. A preliminary (or shortcut) HIDiC design procedure using Hxy diagrams is also proposed. The obvious advantages are that the proposed method allows the direct design of a HIDiC and avoids trial-and-error design using a commercial simulator. In addition, the proposed graphical method can foresee possible pinch points before requiring use of a rigorous simulator. Furthermore, the proposed graphical estimation of internal stages of a HIDiC is applied to a binary methanol−water system and compared to the rigorous simulation results obtained using Aspen Plus. Moreover, the McCabe−Thiele diagram of the HIDiC is also drawn using the extended Ponchon−Savarit method and presented in this study.
    Industrial & Engineering Chemistry Research 11/2009; 49(1). DOI:10.1021/ie9005468 · 2.59 Impact Factor