ABSORPTION OF SULFUR-DIOXIDE IN AQUEOUS DISPERSIONS OF DIMETHYL ANILINE

Absorption of sulfur dioxide in aqueous dispersions of dimethyl anilin e has been carried out in a laboratory stirred cell with a flat gas-li quid interface. The effects of liquid loading, gas concentrations and other parameters have been studied. The absorption rate is linear in g as concentration, and increases with increasing dispersed phase concen tration. Substantial enhancement of absorption compared to that in wat er occurs. Emulsification of the liquid by addition of a surfactant do es not increase the absorption rate. The rate of desorption of sulfur dioxide from a loaded solution at 60 degrees C remains essentially con stant. A theoretical model for absorption has been developed assuming each droplet in the film to be enclosed by a spherical shell of the aq ueous phase through which the solute diffuses at steady state. Compari son of the calculated enhancement factors with the experimental values confirms the validity of the model.