Discussion
Identify an example of a classical diffusional mass transfer process without involving heat, among the following.
Answer: B
The example is carbonation of beverages.
In carbonation, carbon dioxide dissolves into the chilled beverage and diffuses into the liquid, driven by its concentration difference under pressure. It is a gas absorption, a pure mass transfer process, with no heat supplied to drive it.
Drying of food grains and concentration of fruit juice remove water by evaporation, which needs heat for the latent heat of vaporisation. Distillation of alcohol separates components by boiling and condensing, so heat transfer is essential to all three.
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