Purification process for aromatic dicarboxylic acids

Details Purification process for aromatic dicarboxylic acids Purification process for aromatic dicarboxylic acids

1994-12-22

1996-01-02

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562485, C07C 5142

Patent

active

054810337

ABSTRACT:
Disclosed is a process for the purification of aromatic dicarboxylic acids in which the salt of an aliphatic diamine and an aromatic dicarboxylic acid is formed in an aqueous solvent, recrystallized, and contacted with an aliphatic dicarboxylic acid in an aqueous solvent such that the aromatic dicarboxylic acid is recoverable in the form of a purified precipitate. The remaining aqueous solute is a salt of the aliphatic diamine and aliphatic dicarboxylic acid and can be used as a starting material in the manufacture of certain polyamides (nylons). The invention is particularly applicable for purifying 2,6-naphthalene dicarboxylic acid, which is difficult otherwise to purify.

REFERENCES:
patent: 4317923 (1982-03-01), Imai
patent: 5097066 (1992-03-01), Holzhauer et al.
patent: 5149867 (1992-09-01), Chen et al.

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