Method of manufacturing alkali metal salt of 2,3,6,7-naphthalenetetracarboxylic acid
US4942257A · kind A · utility
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Key dates
| Filing date | Aug 31, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Aug 31, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/416
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of manufacturing an alkali metal salt of 2,3,6,7-naphthalenetetracarboxylic acid. Either a sodium salt or a mixture of sodium salt and potassium salt of at least one naphthalenecarboxylic acid selected form the group consisting of naphthoic acids and naphthalenepolycarboxylic acids is heated to an elevated temperature in an inert gas atmosphere in the presence of a Henkel reaction catalyst and halogenated sodium.
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