Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

None of these
If sufficient slot area is not provided, the gas may pass through the skirt clearance
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

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Process Equipment and Plant Design
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

Number of equilibrium stages required is likely to be very small
Feed is not at its bubble point
Number of equilibrium stages in only stripping section is to be calculated
Relative volatility is close to one (e.g., separation of close boiling isomers)

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Geometric mean of the true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD
Differenced of true temperature difference and the LMTD
Ratio of LMTD to the true temperature difference

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