Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

Better flow characteristics
Low pumping pressure drop
All of these
Rapid absorption rates

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Mass Transfer
Steam distillation is not recommended to be used, if the

Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Liquids decompose, if distilled directly at atmospheric pressure

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