Mass Transfer
Channelling is most severe

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

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Mass Transfer
Steam distillation is used to

Increase the efficiency of separation
Avoid thermal decomposition of a component
Reduce the number of plates
Increase the total pressure of distillation

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Mass Transfer
Bollman extractor

Is a static bed leaching equipment
Is used for extraction of oil from oilseed
Is a centrifugal extractor
Employs only counter-current extraction

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