Mass Transfer
Bollman extractor

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

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Mass Transfer
Blowdown in a cooling tower

Increases the scale forming tendencies of water
All of these
Is undesirable
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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