Short residence hydropyrolysis of residues from aromatic carboxylic acid manufacture
US4258227A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1979 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Dec 6, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C1/2078
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Short, less than one second, residence time non-catalytic hydropyrolysis is conducted by rapid heating at more than 600.degree. C. per second of a solid mixture of aldehydo-, carboxy-, keto- and carboxy-, and aldehydo- and carboxy- substituted benzene and toluene and such solid also containing cobalt and/or manganese salts of organic acids and organic and/or inorganic bromides obtained from the manufacture of benzene di- and tricarboxylic acids up to a temperature of at least 700.degree. C. Such short residence hydropyrolysis produces attractive amounts of readily recoverable benzene and toluene as well as lower alkanes and alkenes and a solid carbonaceous char which can be burned to provide heat for the hydropyrolysis. The short residence hydropyrolysis is not subject to short activity and frequent periods of off-stream time as are the catalytic pyrolysis conducted at lower temperatures of from 300.degree. up to 500.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.