4. BALANCES ON MULTIPLE-UNIT PROCESSES
In reality most processes do not consist of just one process unit. There are more than one chemical reactors, units for mixing reactants, blending products, heating and cooling process streams, separating products from each other and from unconsumed reactants, and removing potentially hazardous pollutants from streams prior to discharging the streams to the plant environment.
A system is any portion of a process that can be enclosed in a hypothetical box or boundary. This can include the entire process, an interconnected combination of some of the process units, a single unit, or a point at which two or more process streams come together or one stream splits into branches.
The difference between a multiple-unit process and a single unit process is that the multiple-unit must be isolated and balances must be written on several subsystems of the process to obtain enough equations to determine the unknown variables.
In reality most processes do not consist of just one process unit. There are more than one chemical reactors, units for mixing reactants, blending products, heating and cooling process streams, separating products from each other and from unconsumed reactants, and removing potentially hazardous pollutants from streams prior to discharging the streams to the plant environment.
A system is any portion of a process that can be enclosed in a hypothetical box or boundary. This can include the entire process, an interconnected combination of some of the process units, a single unit, or a point at which two or more process streams come together or one stream splits into branches.
The difference between a multiple-unit process and a single unit process is that the multiple-unit must be isolated and balances must be written on several subsystems of the process to obtain enough equations to determine the unknown variables.
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