Combination of pyrolysis and incineration of solid mixture of oxygen-containing aromatic compounds obtained as residue of manufacture of benzene di- and tricarboxylic acids
US4255590A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Nov 8, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.degree. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.