Mass Transfer
Desulphurisation of petrol is done in a

Bollman extractor
Rotating disc extractor
Plate type extraction column
Packed extraction column

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Mass Transfer
The wetted wall tower is used to determine

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
M.T.C. of liquid in liquid-gas system

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