Category: Mass Transfer

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?

Mass Transfer 16/08/2021
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A. Less number of trays are required
B. Composition of the residue remains unchanged
C. More number of trays are required but the residue composition remains unchanged
D. More number of trays are required and the residue composition is more dilute in methanol

Pick out the wrong statement ?

Mass Transfer 10/08/2021
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A. With decrease in feed temperature, the number of plates required for binary distillation
decreases for a given ‘L/V’ ratio
B. The extraction per unit of total height for a short packed column is more effective than for a
tall column, in case of liquid-liquid extraction
C. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the
bottom
D. Vander wall adsorption is also called chemisorption