Effect of surface resistance on gas absorption accompanied by a chemical reaction in a gas—liquid contactor

Abstract

An analysis of gas absorption accompanied by chemical reaction in the presence of interfacial resistance is presented. The analysis indicates that the effect of interfacial resistance on interphase mass transfer is significantly higher in presence of a reaction compared to the pure absorption case. For fixed values of surface resistance and contact time, the difference between the amount of gas transferred across the interface with and without surface resistance increases as the value of reaction velocity increases. For ranges of contact time and surface resistance of practical relevance, the influence of surface resistance is too high to be neglected while designing gas‐liquid contactors.

The effect of interfacial resistance on gas absorption with chemical reaction: The film theory model

“…1, it is seen that the present closed-form solution using the film theory is in good agreement with that of Ref. [1] using penetration theory. The advantage of the present analysis over the penetration theory analysis is that it is easy to apply avoiding the time dependence, and provides a very simple closed-form solution requiring less computational effort.…”

“…1 and 2, respectively. The results indicate that the interfacial resistance significantly retards the gas absorption rate, with a higher reaction rate 10"° 10" 10 9 10"' 10 6 10' 5 10" 10" [1] are also shown in Fig. 1.…”

“…(9) becomes R, _ YM R tank (10) The effect of interfacial resistance on gas absorption rate may be elucidated in terms of the reduction factor which is the ratio of the amount of gas absorbed with interfacial resistance in a given time to that without interfacial resistance [1]. …”

“…Most of them have been confined to physical absorption examining the interfacial resistance either for an uncontaminated surface [6,8,11,17,18] or for a contaminated surface [2-5, 7, 9, 10, 12-16]. Recently, Asolekar et al [1] extended the analysis to the case of chemical absorption. Their results [1] indicate that the effect of interfacial resistance on interphase mass transfer is more significant in the chemical absorption case than in the pure physical absorption case.…”

“…Recently, Asolekar et al [1] extended the analysis to the case of chemical absorption. Their results [1] indicate that the effect of interfacial resistance on interphase mass transfer is more significant in the chemical absorption case than in the pure physical absorption case. The results are of importance for the proper design of gas-liquid contacting systems, especially for gaseous pollutant removal systems where chemical solvents are generally used to improve the absorption rate which, however, may be greatly affected by the inherent impurity contamination.…”