A spouted mixer-settler



A new type of mixer-settler is described wherein the heavy liquid phase is spouted upward through a depth of light liquid phase and allowed to settle below the light phase. The method does not require mechanical agitation, allows both mixing and settling to occur continuously in the same chamber, and is simple in design.

Optimum conditions have been determined for bench-scale extraction of benzoic acid from toluene by means of a water spout. Independent variables studied were water rate, toluene rate, spout pipe diameter and wall effect. Dependent variables measured were spout height, spout spread, initial entrainment points and stage efficiency. Murphree spoutedphase efficiencies up to 96% were obtained.