Mass Transfer
Steady state equimolal counter diffusion is encountered in

All of these
Separation of a binary mixture by distillation
All liquid-liquid diffusion systems
Absorption of NH₃ from air by water

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Mass Transfer
An example of elutioh is

Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds
Separation of sugar from sugar beet by hot water

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases

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