Process for the purification of 2-hydroxynaphthalene-6-carboxyli

Details Process for the purification of 2-hydroxynaphthalene-6-carboxyli Process for the purification of 2-hydroxynaphthalene-6-carboxyli

1989-01-12

1990-04-10

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562425, C07C 6334

Patent

active

049162578

ABSTRACT:
The invention relates to a process for purification of 2-hydroxynaphthalene-6-carboxylic acid by recrystallization. In this process, the crude acid is recrystallized from water-miscible linear or cyclic aliphatic ethers, aliphatic polyethers or aliphatic hydroxy ethers or from at least 10% strength by weight aqueous solutions of these ethers. Recrystallization from a 35-90% strength by weight aqueous solutions of 1,4-dioxane is particularly preferred.

REFERENCES:
patent: 1593816 (1926-07-01), Andre
patent: 2287864 (1942-06-01), Burton et al.
patent: 4057576 (1977-11-01), Bachmann
patent: 4287357 (1981-09-01), Mueller et al.
patent: 4374262 (1983-02-01), McGinnis
patent: 4393191 (1983-07-01), East
Beilstein, 4th Edition, vol. 10, IV/2 (1983), p. 1994.

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