Fractional batch distillation
Fractional batch distillation offers the possibility to separate a multi-substance mixture into its pure substances with one single column. This is demonstrated in the following tutorial using the triple-substance mixture benzene, tolulol and o-xylene.
Here the simulation is stationary, but can also be generated dynamically via CC-DYNAMICS.
Azeotropic rectification is used to separate azeotropic mixtures.
A typical application example here is the separation of an ethanol-water mixture by adding n-pentane as entrainer.
In the following tutorial, the rectification process is completely modelled in CHEMCAD. It also provides a short outlook on possible optimization approaches.
It is expedient to perform a shortcut simulation for the separation of an almost ideally behaving mixture in order to quickly estimate important parameters of the rectification column, amongst others the apparatus-energy curve and the position of the feed tray beforehand. The following tutorial simulates an application example in CHEMCAD and explains the procedure.
Rigorous column simulation – SCDS
Rectification is used to separate a multiple substance mixture with columns. The following tutorial describes the simulation of a rigorous column, the SCDS column, in detail. In contrast to shortcut simulation, it is also possible to simulate non-ideal substance mixtures with the SCDS column. The rectification process is completely simulated in CHEMCAD and also illustrates optimisation approaches for economic operation.
Design of a Plug Flow Reactor (PFR)
Tubular reactors are widely used in order to perform chemical reactions in gas or liquid flows. A common way to model such reactions is to assume an ideal plug flow inside the tube. In this tutorial, the design of a tubular reactor for a non-catalytic gas phase reaction is illustrated based on the plug flow assumption by using the CHEMCAD unit operation KREA (kinetic reactor). In comparison to an equilibrium-based model like implemented in the unit operations GIBS (Gibbs free energy minimization) and EREA (equilibrium reactor based on given stoichiometries) the KREA unit allows a reactor design when kinetic reaction data is available.
Heat exchanger simulation
Heat exchangers can be easily calculated in CHEMCAD by solving the energy and mass balances. This is completely sufficient for a standard flowchart simulation. However, a more detailed examination is required if the heat transfer and the pressure loss in dependence on the flowing media and the geometry of the heat exchanger are to be determined. The CHEMCAD module CC-THERM contains numerous calculation bases for different types of heat exchangers (tube bundles, plates, air coolers etc.) and application cases (condensation, evaporation, natural circulation, etc.). The use of CC-THERM is explained in this tutorial using a simple example: the rating of a tube bundle apparatus.