In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?

Related Mcqs:

1. In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?

   A. 2.5 B. 5 C. 12.5 D. 17.5...

2. 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...

3. In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?

   A. 2.5 B. 7.5 C. 15 D. 20...

4. The minimum tray spacing in distillation column of diameter less than 3 ft is normally _____________ inches?

   A. 6 B. 18 C. 24 D. 34...

5. In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio?

   A. 1.1 to 1.5 B. 1.6 to 2 C. 2.2 to 2.6 D. 2.7 to 3...

6. A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?

   A. 19 B. 38 C. 67 D. 95...

7. What is the value of ‘q’ for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ?

   A. 0 B. 1 C. 1...

8. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?

   A. 0 B. ∞ C. > 1 D. < 1...

9. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?

   A. 1/10-1/15th B. 1/5-1/10th C. 1/20-1/30th D. 1/2 to 1/4th...

10. 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...