Rdv. Bhat et al., Mass transfer with complex chemical reaction in gas-liquid systems - II: Effect of unequal diffusivities on consecutive reactions, CHEM ENG SC, 54(1), 1999, pp. 137-147
A fundamental description of gas-liquid mass transfer with reversible conse
cutive reaction has been given. The Higbie penetration theory has been used
and numerical simulations were carried out for isothermal absorption. Alth
ough the model can be adapted to reactions of general stoichiometric and ki
netic orders, results have been provided for unit orders only. In Part I, r
esults have been presented for the case of equal diffusivities of all the c
hemical species involved. In Part II, the effect of unequal diffusivity on
the absorption rate and, hence, the overall enhancement factor in consecuti
ve reaction systems has been presented in detail. Results presented here ar
e dedicated to the case where both reaction steps are considered to be reve
rsible. Finally, the model presented in this paper has been used to determi
ne the selectivity towards the intermediate species using data previously r
eported in literature. The model system of chlorination of p-cresol in 1,2,
4-dichlorobenzene has been used for this purpose. The strong influence of t
he mass transfer parameters on the selectivity of the intermediate has been
shown. (C) 1998 Elsevier Science Ltd. All rights reserved.