Difference between batch,mixed flow & plug-flow reactor
- 1. Difference between batch ,PFR & MFR(CSTR)
- 2. Batch Reactor In the batch reactor, or BR the reactants are initially charged into a container, are well mixed, and are left to react for a certain period. The resultant mixture is then discharged. This is an unsteady-state operation where composition changes with time
- 3. Plug flow reactor • In the PFR thr flow of fluid through the reactor is orderly with no element of fluid overtaking or mixing with any other element ahead or behind. Actually, there may be lateral mixing of fluid in a plug flow reactor
- 4. Mixed flow reactor (CSTR) • ideal steady-state flow reactor is called the mixed reactor, the backmix reactor, the ideal stirred tank reactor. , it is a reactor in which the contents are well stirred and uniform throughout. Thus, the exit stream from this reactor has the same composition as the fluid within the reactor
- 5. Continuous and non continous
- 6. Steady or un steady Steady state reactor both the plug flow and mixed flow reactor are steady state reactor Unsteady state reactor batch reactor is a unsteady state reactor because it depends upon time
- 7. Agitated • MFRs and batch reactor usually are equipped with an agitating device (stirrer, agitator) for mixing the reactants but in case of PFRs mixing takes place pependicular to the direction of flow of reactants and they do not have any agitating device as such.
- 8. Composition • in a PFR composition varies along the length of the reactor whereas in a MFR composition of the reactant mixture is uniform throughout the reactor and same as that in the exit line.
- 9. Concentration • in a MFR the concentration of the reactant drops to a low value at a time whereas for PFR the concentration of the reactant decreases progressively (i.e stepwise)and higher conversions can be obtained than MFR for a given reaction.
- 10. Performance equation or design equation
- 11. ApplicationBatchreactor • used in the process industry • laboratory applications • fermentation for beverage • medical production Plugflowreactor • Large-scale production • Continuous production • Fast reactions • High- temperature reactions MFR(CSTR) • waste water treatment processes. • facilitate rapid dilution • both high pH and low pH volatile fatty acid wastes
- 12. Note • CSTRs are less efficient compared to other types of reactors as they require larger reactor volumes to achieve the same reaction rate as other reactor models such as Plug Flow Reactors.