Simultaneous production and purification of 4-nitro-omicron-phthalic anhydride
US4138412A · kind A · utility
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2References
14Claims
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Inventors
Key dates
| Filing date | Jul 11, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Jul 11, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/89
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the simultaneous production and purification of 4-nitro-o-phthalic anhydride which comprises subjecting an impure mixture containing 4-nitro-o-phthalic acid to azeotropic dehydration with selected azeotroping agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.