Mass Transfer
______ extractor uses centrifugal force for separating the two phases.

Schiebel
Podbielniak
None of the listed here
Treybal

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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)

More number of trays are required but the residue composition remains unchanged
Composition of the residue remains unchanged
Less number of trays are required
More number of trays are required and the residue composition is more dilute in methanol

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Uses molal units for material and energy balance
Can use any type of units
Is more accurate than Ponchan-Savarit method

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