Oxychlorination And Combustion Of Propene Of Fly-Ash - Formation Of Chlorinated Benzenes, Dibenzodioxines And Monobenzofurans And Dibenzofurans

Heterogenous gas phase reactions of propene on fly ash in the presence of hydrochloric acid and air between 300-580 degrees C have been investigated. At mild conditions only the formation of polychlorinated C-1, C-2 and C-3 species takes place. At the high temperature end of this study substantial amounts polychlorinated benzenes, dibenzodioxines and mono- and dibenzofurans are observed. This is in contrast with similar experiments using ethene instead of propene.Clearly fly ash behaves not only as a potent catalyst for deep oxidation and chlorination, but accelerates condensation reactions of simple short chain olefins. Under comparable conditions but in the absence of a fly ash bed a low degree of homogeneous propene oxidation was observed at 590 degrees C.