Module-oriented and equation-oriented simulators
Process simulators

The fundamental aspect of process simulation is the identification of the elementary components whose assembly enables the process model to be built. At the conceptual level, and as a direct consequence at the numerical level, there are two opposing approaches: the "module-oriented" (MO) approach and the "equation-oriented" (EO) approach.

• The OM approach has been adopted by the majority of commercial simulators. The most widely used are: Aspen Plusä, Chemcadä, Aspen HYSYSä, Pro/IIä and ProSimPlusä.

  In the OM approach, the basic element for building the process model is the unit operation model known as a "module". This approach corresponds to the classical and natural vision of the process, which results from the arrangement of unit operations dedicated to a precise function such as reaction or separation. The user...