Dedicated to DECHEMA on the occasion of its 50th anniversary An account of the occurrence of pyrolyzable material and the state of development of pyrolysis processes in the USA and Japan is followed by a description of laboratory and pilot-scale experiments designed to exploit the raw material content of pyrolyzable substances rather than the heating value. Plastic waste and scrap tires can be pyrolyzed to give up to 40% by weight of aromatic compounds in fluidized sand beds which are surprisingly insensitive to the unit size of the feed material.

Industrial prototypes for the pyrolysis of used tyres and waste plastic materials. The increasing amounts of old tyres and waste plastics are creating problems regarding their disposal and recycling. Such wastes, however, can be converted by pyrolysis into almost residue‐free organic raw materials. Various processes, particularly for the pyrolysis of old tyres, are described which have been tested in Japan, the USA, Great Britain and the Federal Republic of Germany. In indirectly heated fluidized sand beds whole automobile tyres can be decomposed to give up to 20 wt‐% gas, 30 wt‐% aromatics, 40 wt‐% carbon black, and 10 wt‐% steel scrap.

Nach einer Übersicht über den Anfall an pyrolysierbarem Material und den Stand der Pyrolyseverfahrensentwicklung in den USA und Japan werden Labor‐ und Technikumsversuche beschrieben, die nicht die Ausnutzung des Heizwertes, sondern des Rohstoffgehaltes pyrolysierbarer Produkte zum Ziele haben. In Sandwirbelschichten, die erstaunlicherweise unempfindlich gegen die Eingabestückgröße sind, können Abfallplastik und Autoreifen bis zu 40 Gew.‐% zu Aromaten pyrolysiert werden.

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