Mass Transfer
In a counter-current liquid extractor

Liquid's flow rate depends upon the temperature and pressure
Both liquids flow at fixed rate
Both liquids can have any desired flow rate
Only one of the liquids may be pumped at any desired rate

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Mass Transfer
Channelling is most severe

At very high liquid flow rate
In towers packed randomly with crushed solids
In towers packed with stacked packing
In dumped packing of regular units

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Mass Transfer
The wetted wall tower is used to determine

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

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