A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?

Related Mcqs:

Pick out the wrong statement?

A. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in the downcomer, it may entrain some vapour B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding C. The discharge end of the downcomer must project far enough into … Pick out the wrong statement?Read More...

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?

A. Segmental baffle B. Flat plate extending across the wall C. Disk type baffle D. Helical type baffle...

Pick out the wrong statement ?

A. In a flanged and standard dished head, the crown radius is ≤ shell outside diameter B. In a flanged and shallow dished head, the crown radius is > shell outside diameter C. Flat head covers are most suitable for larger vessels operating at very high pressure D. Flanged only head is a type of … Pick out the wrong statement ?Read More...

Liquid gradient over the tray results due to the___________________?

A. Resistance offered to flow of liquids by caps & risers and the flow of gas B. Low gas velocity C. Large plate spacing D. Large reflux ratio...

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...