Process for producing N,N-disubstituted aminophenol
US5442121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Nov 15, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C213/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing N,N-disubstituted aminophenol which comprises the steps of: obtaining a reaction mixture containing N-substituted aminophenol by reacting a dihydric phenol and an amine; subjecting said reaction mixture to heat treatment so as to thermally decompose quaternary ammonia salt contained in said reaction mixture into a dihydric phenol and an amine, and removing at least said amine by distillation; separating high-boiling impurities by distillation to separate N-substituted aminophenol; and subjecting said separated N-substituted aminophenol to reduction alkylation using an aldehyde compound. According to the present invention, high-purity N,N-disubstituted aminophenol can be obtained in a high yield at high selectivity, and a reduction catalyst can be used repeatedly because its activity can be maintained at a high level and yet it can retain high activity for a long period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.