Process for preparing 2,6-naphthalene-dicarboxylic acid

Details Process for preparing 2,6-naphthalene-dicarboxylic acid Process for preparing 2,6-naphthalene-dicarboxylic acid

1991-04-01

1992-12-29

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562480, 562488, C07C 51347

Patent

active

051753545

ABSTRACT:
The process of this invention for preparing 2,6-naphthalene-dicarboxylic acid comprises a reaction step (Step A) wherein 2,6-naphthalene-dicarboxylic acid potassium salts consisting of 2,6-naphthalene-dicarboxylic acid dipotassium salt and/or 2,6-naphthalene-dicarboxylic acid monopotassium salt are allowed to react with benzene-carboxylic acids in the presence of water to yield 2,6-naphthalene-dicarboxylic acid and benzene-carboxylic acid potassium salts and a separation step (Step B) wherein the crystallized 2,6-naphthalene-dicarboxylic acid is separated from the benzene-carboxylic acid potassium salts dissolved in the aqueous solution and provides 2,6-naphthalene-dicarboxylic acid, useful as raw material for polymers, at low cost on a commerical scale with recycle of potassium.

REFERENCES:
patent: 3888921 (1975-06-01), Yamamoto et al.
patent: 3954840 (1976-05-01), Yamashita et al.
Fujishiro et al. The Chemical Society of Japan, vol. 62, No. 3 (1989), pp. 786-790.

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