Mass Transfer
Bollman extractor

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

Comprises of thin bed of substances of extended surface having high porosity
All of these
Helps in increasing the settling rate of the bubbles
Helps in increasing the bubble size entering the settler

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