Title | Azeotropic Distillation in a Middle Vessel Batch Column. 1. Model Formulation and Linear Separation Boundaries |

Publication Type | Journal Article |

Year of Publication | 1999 |

Authors | Cheong W, Barton PI |

Journal | Industrial & Engineering Chemistry Research |

Volume | 38 |

Pagination | 1504-1530 |

Abstract | A mathematical model for the middle vessel batch distillation column ({MVC}) is developed using the concept of warped time analysis and used to study the qualitative dynamics of the {MVC} when it is used to separate multicomponent azeotropic mixtures. A limiting analysis is then developed for a {MVC} with an infinite number of trays, operated under infinite reflux/reboil ratios, under the assumption of linear separation boundaries. It is determined that, under limiting conditions, the distillate product drawn from the {MVC} is given by the alpha limit set of the {MVC} still pot composition, while the bottoms product drawn from the {MVC} is given by the omega limit set of the {MVC} still pot composition. The net product composition is determined by taking a convex combination of the two products. The notions of steering the still pot composition, the vector cone of possible motion for the still pot composition, and the equivalency of the {MVC} to the combined operation of a batch rectifier and a stripper are also explored. The definition of batch distillation regions for the {MVC} operated at a given value of the middle vessel parameter lambda, and the bifurcation of these regions with the variation of lambda, are investigated. Lastly, a mathematical model incorporating the concept of warped time is developed for a multivessel column. The {MVC} can be viewed as a specific case of the multivessel column. |

URL | http://dx.doi.org/10.1021/ie980469r |

DOI | 10.1021/ie980469r |

# Azeotropic Distillation in a Middle Vessel Batch Column. 1. Model Formulation and Linear Separation Boundaries

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