Chemical Engineering :: Mass Transfer
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Agitator is provided in a crystalliser for
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__________ diffusion is used for separating the isotopes of methane.
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Ordinary diffusion process is also called __________ diffusion.
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Pick out the wrong statement.
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Pick out the wrong statement pertaining to the rotary dryer.
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The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
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If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
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Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
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Raoult's law is applicable to the
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Weeping in a distillation column
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A.
Different solids have different equilibrium moisture curves.
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B.
Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column.
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C.
Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column.
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D.
Even a forced draft cooling tower can not cool water below the wet bulb temperature.
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A.
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12% of the inside diameter of shell.
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B.
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.05 to 0.15.
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C.
Rotary dryer is suitable for drying sticky material.
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D.
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute.
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