By Hendrik A. Kooijman and Ross Taylor

For more information on latest version of Chemsep click here

Department of Chemical Engineering, Clarkson University, Potsdam, NY



  • ChemSep is a program for performing multicomponent
    separation process calculations. ChemSep was created
    specifically for use in courses on thermodynamics and/or separation
  • ChemSep integrates flash, the classic equilibrium stage
    column model and a nonequilibrium or rate-based column model in one
    easy to use program.
  • Graphical User Interface: New in Release 5.0 is a
    graphical user interface for Windows that retains much of the look and
    feel of the classic ChemSep interface. Problem solving is even
    easier with the new version however; new features make navigation
    within the interface much faster and the novice is taken through the
    problem solving process in a natural way. Input may include simple
    algebraic calculations as well as units. ChemSep checks your
    input, lets you know when each phase of problem setup is complete, and
    flags potential sources of difficulty before running a simulation.
  • Nonequilibrium column model: Taking the guesswork out of
    column simulation, ChemSep features a sophisticated
    nonequilibrium or rate-based model. The model in ChemSep
    includes the only available rate-based model for liquid-liquid
    extraction. The built in Design Mode allows the engineer to
    use proven rate-based technology in preliminary design.
    ChemSep features more column mass transfer coefficient
    correlations than any other similar model.
  • Databank: ChemSep comes with a databank of 189
    common chemicals. Available at additional cost is a license to the
    industry standard DIPPR databank of over 1000 chemicals. Users can
    create their own libraries of physical property data. Chemical formula,
    structure, CAS number, or one of 50+ property values including
    temperature dependant properties can be used to select components.
  • Thermodynamic and Physical Property Models:
    ChemSep includes almost all of the most widely used
    thermodynamic models: 7 K-value models including DECHEMA (modified
    Raoult’s law), Equation of State, and Chao-Seader; 10 Activity
    coefficient models including UNIFAC; and 8 equations of state including
    Peng-Robinson and Hayden-O’Connell (with chemical theory). ChemSep also
    includes a large number of physical property models (viscosity, thermal
    conductivity, surface tension, diffusivity) that are needed in
    nonequilibrium column modeling.
  • Performance Correlations: ChemSep includes over
    40 correlations for mass transfer coefficients in different types of
    column, as well as 18 different ways to estimate pressure drop and 16
    for holdup.
  • Degrees of Freedom Analysis: ChemSep tells you
    the number of degrees of freedom and identifies how many variables
    remain to be specified.
  • Powerful plotting capabilities: ChemSep has
    extensive support for plotting almost any kind of column profile
    including composition, flow, temperature, pressure, K-values, and much
    more. The plots are completely configurable. ChemSep uses the
    Open Source package Gnuplot (for Windows) to display a plot in its own
    separate window. Plots may be pasted directly into a word processor.
    Users can design their own plots and include them in the pull-down plot
    selection list for future use. From the results of a nonequilibrium
    simulation one can plot profiles of any physical property as well as
    numerous design-related variables such as froth height in a tray
    column, approach to flooding, or specific interfacial area (these are
    just a few of many variables that can be plotted).
  • McCabe-Thiele Diagrams are a standard feature in
    ChemSep (even for multicomponent systems).
  • Export: Simulation results may be saved in a variety of
    formats such as text, html and csv. Tables and graphs may be sent
    directly to a text editor such as Notepad or spreadsheet program such
    as Excel.

A great deal more information about ChemSep may be
found on our web



A version of ChemSep with limited functionality is
available for free download from
ChemSep-Lite is limited to no more than four components, a
databank with a limited number of components, no more than 50 stages in
a column simulation, and no nonequilibrium model.


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