Combination of pyrolysis and incineration of solid mixture of oxygen-containing aromatic compounds obtained as residue of manufacture of benzene di- and tricarboxylic acids

摘要

Solid residues obtained from the manufacture of benzene di- or tricarboxylic acid by the oxidation of di- or trimethyl substituted benzene with air in the presence of catalysis from a source of bromine in combination with one or both of cobalt and manganese when incinerated can produce bromine-containing particulates whose discharge into the atmosphere may be undesirable. The discharge of such bromine-containing particles into the atmosphere can be avoided by subjecting said solid residue in comminuted form or such form suspended in 30 to 50 weight percent water to continuous pyrolysis in the presence of an inert particulate solid in a zone heated to a temperature of at least 700 DEG C., contacting the gaseous product or a portion thereof after removal of benzene and toluene therefrom with a carbonate, hydroxide or oxide of one or both of calcium and magnesium and then incinerating the gaseous product or said portion thereof.