The performance of a packed absorption tower is to be evaluated from the following experimental results. The test tower is 6 ft in diameter and is packed to a depth of 10 ft with 1-in. metal Pall rings. Test runs are made for the absorption of hexane vapor from air into a non-volatile hydrocarbon oil. In the tests, gas and liquid streams enter the tower at 140°F and absorption occurs isothermally. The equilibrium constant  forhexane in the oil is 0.79 on a mole fraction basis at 140°F and 1 atm. The molecular weight of the oil is 200 kg/kmol. Using the data below determine:

(a) The height of an overall gas-phase transfer units, , at 1atm and at 2 atm.

(b) The individual heights of a transfer unit,  and  assuming that they are independent of pressure. Note that K is a function ofpressure.

(c) Determine the mass transfer coefficients  and .

Transcribed Image Text:

K=yA/xA