The diffusional model for solvent removal from porous rubber particles in aqueous slurries that was derived from batch laboratory experiments gives a good correlation of data obtained in a commercial-scale, continuous-flow vessel. The model accounted for the effects of the major operating variables. Also, the value of the effective crumb radius, the only parameter in the model, was in reasonable agreement between the batch and continuous experiments.However, three simplifying assumptions were required for the analysis of the continuous flow data: (1) the crumb in the vessel is perfectly mixed; (2) the rubber concentration is the same in the vessel as in the feed; and (3) the crumb size does not affect R, the effective crumb radius for diffusion.Approximation of the crumb residence time distribution by an exponential probably does not lead to serious error.Literature Cited