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UNIT - II 3 . ( a ) Write a note on pressure drop in packed towers for absorption . ( b ) A gas
UNITII
a Write a note on pressure drop in packed towers for absorption
b A gas from a petroleum distillation column has its concentration of reduced from mole moles inert gas to of its value by scrubbing with a tri ethanol amine with water as a solvent in a counter current tower of height operating at and atm. The equilibrium relation is Pure solvent enters the tower and leaves containing mole mole of solvent. If the flow of inert hydrocarbon gas is kgmol and the gas phase controls the mass transfer. Calculate the overall coefficient for absorption
a Explain sieve trays and bubble cap trays.
b It is desired to recover ammonia from airammonia mixture containing ammonia at and at atm by scrubbing with water in a tower packed with rasching rings. If the gas flow rate is min at the inlet and liquid flow rate is times the minimum. Estimate the height of packed tower for countercurrent operation. Absorption is assumed to be isothermal. The equilibrium relation is given by where are gas and liquid phase composition of ammonia in mole fraction respectively. The overall mass transfer coefficient is mole
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