Process design and optimization are fundamental steps to
ensure the economic sustainability of chemical processes. Suitable description
of the performance of the various unit operations of the plant should be made
and integrated, to understand the mutual interferences both under steady state
conditions and under unsteady operation. Process simulation tools are helpfulto compute both situations. The stationary case can be simulated with packages
dealing with material and energy balances applied to each unit and extended to
the whole plant.
More complex is the unsteady state case, which needs dynamic
modelling to describe the time-dependent evolution of the system. Separation
equipment are simulated using algorithms embedded in process simulators, which
may be more or less complex and adequate to represent the system with the
desired approximation. A key issue in this case is the correct choice of a thermodynamic
package able to cope with the system complexity in sufficient detail, in order
to make reliable previsions on phase equilibria and components partition among
them.(Read more)
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