Mass Transfer
Perforated plate towers are unique for solvent extraction because, they provide

Better contact of the phase
Repeated coalescence & redispersion of the drop phase
None of these
Higher contact area

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Mass Transfer
The wetted wall tower is used to determine

The overall M.T.C. of the system
M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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