A. Sorel-Lewis method
B. McCabe-Thiele’s method
C. Ponchon-Savarit method
D. None of these
Related Mcqs:
- 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 - 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. - Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?
A. Flow rates of each fluid
B. Type and size of packing
C. Concentration of each fluid
D. All A, B. & C. - 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 - Souders Brown equation given by, U = Kv √(ρl – ρv)/ρv, is used for the calculation of the ______________ in a continuous distillation column?
A. Diameter of the bubble cap column
B. Diameter of the sieve plate column
C. Tray pressure drop
D. Residence time in the downcomer for the disengagement of entrained vapour - In case of a continuous distillation column, increase in reflux ratio may result in the______________?
A. Lower fixed charges for the column
B. Greater cost for the reboiler heat supply
C. Greater cost for the condenser coolant
D. All A., B. and C. - For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2 - Optimum reflux ratio in a continuous distillation column is determined by the__________________?
A. Maximum permissible vapour velocity
B. Flooding limit of the column
C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
D. None of these - 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 - Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap
C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range
