21. The individual mass transfer co-efficients (moles/m2.s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling?
22. As the reflux ratio in a distillation coloumn is increased from the minimum, the
23. As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
24. If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
25. A binary mixture of benzene and cyclohexane is separated by
26. The relative saturation of an unsaturated mixture of gas and vapor is independent of the
27. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
28. Which of the following plays an important role in problems of simultaneous heat and mass transfer?
29. In most of the vacuum crystalliser, vacuum is generally produced by means of a
30. A minimum boiling azeotrope is exemplified by
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