Process for separating nitroaromatic compounds from spent nitric acid
US4642396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1984 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Aug 7, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention pertains to a process for extracting a nitroaromatic composition from a nitration medium containing nitric acid, water, and nitroaromatic. The process comprises contacting the nitration medium with nitric oxide under conditions such that the nitric oxide will react with the nitric acid to form nitrogen dioxide and water. Gaseous nitrogen dioxide is removed from the reaction medium and accordingly, the dissolved nitroaromatic present in the nitration medium separates to form an organic phase which then can be removed by decantation. Typically, one mole of nitric oxide is added to the nitration medium for every two moles of nitric acid present in said medium. Reaction conditions normally are from about 0.degree. to 90.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.