Mass Transfer
Low viscosity absorbent is preferred for reasons of

All of these
Low pressure drop on pumping
Improved flooding characteristics
Rapid absorption rates and good heat transfer characteristics

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

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

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high
One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent

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Mass Transfer
In a counter-current liquid extractor

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

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