A type of impeller used for gas dispersion such as in biochemical reactors and consists of a flat disc with six vertical flat blades mounted on the circumference (see Fig. 54). It therefore provides radial-flow mixing. It is named after American chemical engineer John Henry Rushton (1905–85), who was noted for his work on mixing. There have been many subsequent modifications and improvements to the basic design.

Fig. 54 Rushton impeller