Flow sheets sequential operations

In a sequential-modular program the executive program sets up the flow-sheet sequence, identifies the recycle loops, and controls the unit operation calculations interacting with the unit operations library, physical property data bank and the other sub-routines. It will also contain procedures for the optimum ordering the calculations and routines to promote... 

Assuming that the annual production requirement has been established, one of the first problems faced in process design is to choose a process cycle so that material and energy balances on a time basis can be worked out and all of the necessary flow sheets prepared. Questions related to a 24-hr or 8 hr/day operation and production by sequential batch operation or on a steady-state continuous basis must be resolved. 

Simulation of S5mgas processes are performed using flow sheeting [82], where the individual unit operations are connected by streams and the heat and mass balances for the entire process are solved sequentially. Well-proven commercial tools and solution methods for many processes are available as described in [82], but to design catal c processes both simplified and rigorous reactor models are key items and for this purpose a dedicated tool such as the one described in [116] can be used. 

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