Method of preparing high purity 2,6-naphthalene dicarboxylic aci

Details Method of preparing high purity 2,6-naphthalene dicarboxylic aci Method of preparing high purity 2,6-naphthalene dicarboxylic aci

1994-12-23

1995-09-12

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 543

Patent

active

054498201

ABSTRACT:
The present invention provides a method of preparing high purity 2,6-naphthalene dicarboxylic acid in which the contents of coloring substances, heavy metal and bromine compounds can be reduced by dissolving coarse crystals of 2,6-naphthalene dicarboxylic acid containing impurities in supercritical or subcritical water containing an entrainer composed of an organic solvent containing oxygen and having a specific solubility parameter, and by cooling an obtained solution to cause crystals to precipitate so as to separate the crystals from mother liquor.

REFERENCES:
patent: 4345976 (1982-08-01), Peter
patent: 4514574 (1985-04-01), Inoue et al.
patent: 4550198 (1985-10-01), Myerson
patent: 4964995 (1990-10-01), Chum et al.

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