Adiabatic process for making mononitrobenzene
US8692035B2 · kind B2 · utility
1Cited by
5References
19Claims
0Family size
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Inventor
Key dates
| Filing date | Nov 10, 2008 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Dec 14, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An adiabatic process for making mononitrobenzene by the nitration of benzene which minimizes the formation of nitrophenols and dinitrobenzene by-products. The process uses a mixed acid having less than 3 wt % nitric acid, 55 to 80 wt % sulfuric acid, and water. The initial temperature of the mixed acid is in the range of 60 to 96° C. The nitration reaction is complete in about 300 seconds and produces less than 1,200 ppm nitrophenols and less than about 80 ppm dinitrobenzene. The reaction can be carried out in a plug-flow or a stirred pot reactor, or a combination of such reactors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.