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
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Both liquids can have any desired flow rate
Both liquids flow at fixed rate
Liquid's flow rate depends upon the temperature and pressure

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