Fully self-cleaning reactor/mixer with a large usable volume

A disc reactor comprising:

• a surrounding housing;
• two or more parallel, axially directed, counter-rotating shafts disposed in said housing;
• each said shafts having respective groups of intermeshing toothed discs spaced apart and consecutively mounted on said shafts;
• each disc including a plurality of circumferentially spaced apart radially extending teeth, and scrapers;
• each scraper extending along an axial direction having a first end fixed to one of the tooth discs, and a second end of each scraper pointing to a circumferential space between said teeth of a consecutively mounted toothed disc on the same shaft;
• said scrapers further having surfaces wherein any radial section the surfaces of the scrapers are either epicycloids or circles around the center of rotation of the shaft, and every second scraper of one shaft lying in the same radial section is connected to the axially preceding toothed disc, while the other scrapers are connected to the axially consecutively mounted disc, wherein all surfaces of the scrapers perpendicular to the shafts are wiped by toothed discs, all other surfaces of the scrapers of one shaft is wiped by scrapers of the other shaft.