Mass Transfer
Bollman extractor

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
Temperature of the liquid phase is equal to that of the vapor phase
All of these

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