A. Plate spacing
B. Depth of liquid above the bubble cap slots
C. Vapour velocity in the volume between the plates
D. All A., B. and C.
Related Mcqs:
- Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?
A. η = 17 – 61.1 log μ
B. η = 24.6 (Δp/μ)
C. η = 1.66 – 0.25 log μ
D. η = 0.25 log μ – 1.67 - Which of the following is used to set the diameter of the distillation column ?
A. Number of theoretical plates
B. Static submergence
C. Allowable vapour velocity
D. Length of straight rectangular weir on cross-flow tray - In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps?
A. 1.3 to 2
B. 1.6 to 2
C. 2.5
D. 1.5 to 3 - In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?
A. Liquid gradient on the tray
B. Lower skirt clearance
C. Lower static submergence
D. Small downcomer liquid seal - Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity?
A. 0.1 to 0.3
B. 0.6 to 0.7
C. 0.85 to 0.95
D. 1.5 to 2 - Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?
A. Relative volatility is close to one (e.g., separation of close boiling isomers)
B. Feed is not at its bubble point
C. Number of equilibrium stages in only stripping section is to be calculated
D. Number of equilibrium stages required is likely to be very small - With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases?
A. Fixed charges initially
B. Running cost of cooling water for condenser
C. Vapour & liquid load both
D. Running cost of steam for reboiler - Pressure drop per tray in the atmospheric distillation column is about ________________ psi?
A. 0.01 – 0.5
B. 0.07 – 0.12
C. 0.5 – 1.0
D. 1 – 3 - Overall tray efficiency of a distillation column is the ratio of the number of ___________________?
A. Overall gas transfer units to the number of ideal trays required
B. Ideal trays required to the number of real trays required
C. Real trays required to the number of ideal trays required
D. None of these - Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?
A. Sensible heat differences are small, because the temperature changes from tray to tray is small
B. Trouton’s rule is applicable
C. Liquid/vapor loading across the column remains constant
D. All A., B. and C.
