Process for the preparation of 1,4-naphthoquinone
US4035399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Apr 30, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C46/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In the process for the preparation of 1,4-naphthoquinone by vapor phase oxidation of naphthalene with a molecular oxygen containing gas using a solid catalyst consisting essentially of an inert carrier supporting thereon a catalyst composition comprising as essential active components vanadium pentoxide, an alkali metal sulfate and an alkali metal pyrosulfate, the improvement which comprises supplying to the raw material feed sulfur or a sulfur compound capable of yielding sulfur trioxide in a system as to maintain the equilibrium between the alkali metal sulfate and the alkali metal pyrosulfate in the catalyst composition and keep the proportion of the active components constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.