Mass Transfer
Bollman extractor

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

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Mass Transfer
Dew point of an air-water vapor mixture

At constant humidity & total pressure is fixed
All of the listed here
Decreases with decrease in pressure
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, decreases surface area
Increases pressure drop, decreases surface area
Increases pressure drop, increases surface area
Decreases pressure drop, increases surface area

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