Mass Transfer
Low viscosity absorbent is preferred for reasons of

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency

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