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Process Equipment and Plant Design

Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Excessive liquid gradient over the tray
Low gas velocity
Low reflux ratio
High gas velocity

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Process Equipment and Plant Design
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.

30
10
35
20

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Process Equipment and Plant Design
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

4P²/πd
(P² - πd²/4)/πd
Πd/4P²
4(P² - πd²/4)/πd

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Process Equipment and Plant Design
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Vapour & liquid load both
Fixed charges initially
Running cost of steam for reboiler
Running cost of cooling water for condenser

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Process Equipment and Plant Design
In perforated plate towers, the

Pressure drop is less compared is similar bubble cap towers
Hole sizes may be around 1/8" or 3/16"
Total hole area may be around 6 to 15% of tower cross-sectional area
All of these

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Process Equipment and Plant Design
For turbine agitator, the impeller diameter is about

0.65 to 0.85 d
0.3 to 0.5 d
0.95 d
0.1 to 0.2 d

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