INFLUENCE OF ELEMENTAL SULFUR ON THE DE-NOVO-SYNTHESIS OF ORGANOCHLORINE COMPOUNDS FROM RESIDUAL CARBON ON FLY-ASH

Thermal experiments between 300 degrees C and 500 degrees C were perfo rmed with fly ash of a municipal waste incineration plant which had be en spiked with elemental sulfur. The influence of elemental sulfur on the heterogeneous carbon-decomposition and the de-novo-synthesis of po lychlorinated compounds was investigated. Compounds such as polychlori nated dibenzodioxins, dibenzofurans, benzenes, benzo- and dibenzothiop henes, Cl-4-thiophene, Cl-4-thienothiophene, Cl-7- and Cl-8-phenylthio phene were quantified. Apart from those, other intermediate structures were determined. These compounds are mainly aromatics with a vinyl- o r butadienyl-group, stabilized by perchlorination. In detail, the comp ounds are Cl-7- and Cl-8-styrene, Cl-10-vinylnaphthalenes, Cl-10-pheny lbutadiene, Cl-10-octatetraene, Cl-10-bisbutadienylsulfides and Cl-12- stilbenes. (C)1998 Elsevier Science Ltd. All rights reserved