(231d) Reduced Order Modeling of Rate-Based Distillation Columns
AIChE Spring Meeting and Global Congress on Process Safety
Thursday, April 10, 2008 - 9:45am to 10:10am
This work presents an application of orthogonal collocation to a rigorous, nonequilibrium rate-based packed column. The low order model is constructed with a focus on the feed discontinuity, which is treated as a separate adiabatic flash.
An objective function is defined as the model solution to a combination of degrees of freedom. This definition allows for multiple solutions to a single separation specification to be found. The optimal solution can be subsequently found using an optimization routine. The construction of the objective function ensures that there is always a solution to the design problem.
The resulting low order model has potential use in for the design of distillation trains. If a full-order model is used, numerical difficulties ensue due to the resulting high degree of problem stiffness.
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