Gas-Liquid Interphase Mass Transfer Theory of Absorption Processes

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Abstract The present paper aims at the understanding on the gas-liquid mass transfer mechanism of absorption process.On the basis of molecule thermodynamics,combining the general chemical potential driving force equation of mass transfer flux,a concentration corrrelation at interface between two phases is derived and solved under different bulk liquid concentrations in absorption process.The computational results show that the interfacial concentration of absorbed component on liquid side is strongly affected by a Biot number Yo and is also bulk concentration dependent.For the absorption process in which the gas phase resistance to mass transfer between two phases is neglectable,the mass transfer rate is mainly dominated by liquid bulk concentration and thickness of liquid film.The CO_2 interfacial concentration on liquid side in stationary absorption by pure methanol,ethanol and n-propanol absorbent respectively are measured using micro laser holographic interference technique to validate the model proposed,the experimental values are in good agreement with the calculated ones.

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Received 2007-05-15; published 2007-05-15

Cite this article:

GAO Xi-qun~.Gas-Liquid Interphase Mass Transfer Theory of Absorption Processes[J] Chemcial Industry and Engineering, 2007,V24(3): 203-206

[1]	WHITMAN W G.The two-film theory of absorption[J].Chemistry and Metal Engineering,1923,29(1):147-157.
[2]	HIGBIE R.The rate of absorption of a pure gas into a stillliquid during short periods of exposure[J].Transactions ofthe American Institute of Chemical Engineers,1935,31(2):365-377.
[3]	DANCKWERTS P V.Significance of liquid-film coefficientsin gas absorption[J].Industrial Engineering and Chemistry.1951,43(6):1-
[4]	TOOR H L,MARCHELLO J M.Film-penetration model formass and heat transfer[J].AIChE Journal.1958,4(1):97-101
[5]	LAMONT J C,SCOTT D S.An eddy cell model of masstransfer into the surface of a turbulent liquid[J].AIChEJournal,1970,16(3):513-519.
[6]	LEVICH V G.Physicochemical Hydrodynamics[M].NewYork:Prentice-Hall,1962.
[7]	LOCHIEL A C,CALDERBANK P H.Mass transfer in thecontinuous phase around axisymmetric bodies of revolution[J].Chemical Engineering Science.1964,19(7):471-484
[8]	PETERA J,WEATHERLEY L R.Modelling of masstransfer from falling droplets[J].Chemical EngineeringScience,2001,56(16):4 929-4 947.
[9]	TOM P.Oxygen absorption into moving water and tensidesolutions[J].Water Research,2000,34(9):2 569-2 581.
[10]	KHAN A R,DIMITRIOS G,NICHOLAS A K,et al.Fluxof gases across the air-water interface studied by reversed-flow gas chromatography[J].Journal of Chromatography A.2001,934:31-49
[11]	PIEROTTI R A.The solubility of gases in liquids[J].JPhys Chem.1963,67:1-
[12]	BENNETT C O,MYERS J E.Momentum,Heat and MassTransfer[M].Third ed.New York:McGraw-Hill BookCompany,1982.495-498.
[13]	MA Y G,CHENG H,YU K T.Measurement ofconcentration fields near the interface of a rising bubble byholographic interference technique[J].Chinese J ChemEng,1999,7(4):363-367.
[14]	YONG S W,DONG K C,ANTHONY F M.Density,viscosity,surface tension,and carbon dioxide solubility anddiffusivity of methanol,ethanol,aqueous propanol,andaqueous ethylene glycol at 25��[J].J Chem Eng Data.1981,26:140-141