Method for recovering pure metahydroxybenzoic acid

Details Method for recovering pure metahydroxybenzoic acid Method for recovering pure metahydroxybenzoic acid

1981-09-08

1982-09-21

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6501

Patent

active

043508278

ABSTRACT:
A method for recovering purified m-hydroxybenzoic acid from crude m-hydroxybenzoic acid alkali metal salt. The method comprises dissolving the crude m-hydroxy benzoic acid alkali metal salt in water at a ratio of between about 13 and 20 milliliters of water per gram of pure m-hydroxybenzoic acid alkali metal salt contained in the crude salt; acidifying the resulting solution to a pH of below 2 with a mineral acid to neutralize all alkali metal hydroxide present and to convert the m-hydroxybenzoic acid alkali metal salt to free m-hydroxybenzoic acid; and cooling the solution to from about 0.degree. C. to about 15.degree. C. for a sufficient time to crystallize purified m-hydroxybenzoic acid from the solution.
The method is particularly effective for removing impurities of parahydroxybenzoic acid, alkali metal hydroxide and water soluble inorganic salts.

REFERENCES:
patent: 3468942 (1969-09-01), Blum

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