Process for the preparation of 1-nitroanthraquinone
US3959317A · kind A · utility
2Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1975 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C50/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of 1-nitroanthraquinone by nitration of anthraquinone in the presence of highly concentrated nitric acid, characterised in that nitration is carried out at temperatures of 20.degree. to 80.degree.C, the reaction is terminated by lowering the nitric acid molar fraction in the reaction mixture to .ltoreq.0.85 by distilling off concentrated nitric acid and 1-nitroanthraquinone is precipitated by subsequently adjusting the nitric acid molar fraction to .ltoreq.0.7 to 0.4 and is separated off in a manner which is in itself known.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.