Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Partial pressure of component A to the total pressure
Vapour pressure of component A to that of component B

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Mass Transfer
Bollman extractor

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

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