The dynamic behaviour of these processes involves the relationships between
time de pendent inputs and the output variables which also vary with time.
The unsteady - tate characteristics of processes are important in two
classes of problems; viz :
I - Start up problems
II -Control problems
In the present paper a simplified treatment of the dynamic behaviour of
a mixer - settler unit is considered , first theoretically and then experimentally.
Also the literatuer on solvent - extraction dynamics is reviewed and
discussed .
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