Mass Transfer
Ammonia present in the coke oven gas is removed by washing with

Dilute HCl
Ethanolamine
Caustic solution
Dilute ammoniacal liquor

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Mass Transfer
Entrainer used in azeotropic distillation should

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 latent heat of vaporisation
Have high viscosity to provide high tray efficiency

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