It is desired to recover hexane vapor (solute A) from air using an absorption process. The absorption solvent is a nonvolatile mineral oil, which has a mass density of 0.80 g/cm^{3}and a molecular weight of 180 g/gmole. In the dilute concentration range, the equilibrium relationship for the dissolution of hexane vapor in the mineral oil at 20°C is described by p_{A,i}= H x_{A,i}, where H = 0.15 atm. At the present conditions of operation, the hexane partial pressure in the bulk gas stream is 0.0 15 atm, and the dissolved hexane in the bulk absorption solvent is 5.0 mole%. The total system pressure is 1.50 atm, and the temperature is 20°C. The liquid film mass-transfer coefficient k_{x}is 0.01 kgmole/m^{2}· s, and the gas film mass-transfer coefficient is k_{y}0.02 kgmole/m^{2}· s.

a. What is the overall mass-transfer coefficient based on the liquid phase, K_{L}, and molar flux N_{A}?

b. What is the composition of hexane at the gas€”liquid inter face, in terms of p_{A,i} and x_{A,i}?

Fundamentals Of Momentum Heat And Mass Transfer

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

ISBN: 9781118947463

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