Production method of 2-methyl-5-nitrophenol
By producing 2-methyl-5-nitrophenol directly from o-toluidine, the 2-methyl-5-nitroaniline stage is avoided, solving the problems of high cost and large wastewater volume of the existing process, and achieving a more efficient production and environmental protection effects.
Patent Information
- Application Number
- CN201610205000.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2016-04-05
- Publication Date
- 2016-08-10
- Estimated Expiration
- 2036-04-05
AI Technical Summary
The existing 2-methyl-5-nitroaniline-diazotization-hydrolysis process has high costs and a large amount of wastewater, resulting in high costs and serious environmental pollution in the production of 5-nitro-o-cresol.
A new process is adopted to directly produce 5-nitro-o-cresol using o-toluidine as raw material without going through the 2-methyl-5-nitroaniline stage, by using alumina and manganese tetroxide under the conditions of concentrated sulfuric acid and nitric acid. As a catalyst, combine sodium nitrite for reaction. After cooling, concentrated nitric acid and sodium nitrite are added dropwise to perform diazotization and denitrification. Finally, it is heated and kept warm to obtain 2-methyl-5-nitrophenol.
It significantly reduces production costs and environmental pollution, increases product yield, and reduces equipment investment and raw material consumption.