Process for preparing 1,4-naphthoquinone

Details Process for preparing 1,4-naphthoquinone Process for preparing 1,4-naphthoquinone

1975-07-09

1977-06-28

Garner, Vivian

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252416, 2603464, C07C 4966

Patent

active

040325482

ABSTRACT:
1,4-Naphthoquinone is prepared by reacting naphthalene with molecular oxygen in a gaseous phase in the presence of a catalyst containing vanadium. Prior to reacting the naphthalene with oxygen, the catalyst is pre-treated with molecular oxygen at 300.degree. to 400.degree. C in the absence of organic compounds and immediately thereafter a gas mixture containing naphthalene and molecular oxygen is passed over the pretreated catalyst at temperatures in the range of 300.degree. to 400.degree. C. The catalyst pre-treatment can be carried out in the presence of water vapor and the subsequent reaction of naphthalene with molecular oxygen can also be carried out in the presence of water vapor.

REFERENCES:
patent: 2765323 (1956-10-01), Dixon et al.
patent: 3095430 (1963-06-01), Wittstein
patent: 3232955 (1966-02-01), Nonnenmacher et al.
patent: 3402187 (1968-09-01), Kaiser et al.

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