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Process Equipment and Plant Design

Process Equipment and Plant Design
Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.

5-7.5
2.5-3.0
10-12.5
15-20

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Process Equipment and Plant Design
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

An increase in relatived volatility for rectification columns
All of these
Decrease in gas solubility for absorbers
An increase in liquid viscosity

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Process Equipment and Plant Design
In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

1.2 Aa = 1.2 Sa
Aa = 1.5 Sa
Sa = 1.5 Aa
Aa = Sa

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Process Equipment and Plant Design
Bubble cap plate column is

A continuous contactor
A finite stage contactor
Used only for distillation, not for absorption
A differential stage contactor

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Process Equipment and Plant Design
A cylinderical pressure vessel of volume 6 πm³ has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm² and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

5 mm
10 mm
8 mm
6 mm

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Process Equipment and Plant Design
Le/D for fully open globe value may be around

10
75
25
300

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