PRODUCTION OF 5-AMINO-2,4,6-TRIIDOISOPHTHALIC ACID

Title:

PRODUCTION OF 5-AMINO-2,4,6-TRIIDOISOPHTHALIC ACID

Document Type and Number:

Japanese Patent JPH10316639

Kind Code:

A

Abstract:

To provide a method for obtaining a high-purity objective substance without requiring a high-pressure condition while preventing the formation of by-product in producing 5-amino-2,4,6triiodoisophthalic acid by using 5- nitroisophthalic acid as a raw material.

5-Nitroisophthalic acid is reduced with hydrogen in the presence of an alkali metal hydroxide in an atmosphere having an isoelectric point of 5-nitroisophthalic acid especially in the range of pH 4-7 to form an alkali metal salt of 5-aminoisophthalic acid, which is made into liberated 5-aminoisophthalic acid with sulfuric acid or phosphoric acid. The liberated 5-aminoisophthalic acid is triiodated by treatment with a hydrochloric acid solution of iodine monochloride.

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Inventors:

TANAKA YOSHINORI
ASASHIGE NAOKI
NAKAMURA MITSUO
SEKI RYOICHI

Application Number:

JP12677697A

Publication Date:

December 02, 1998

Filing Date:

May 16, 1997

Export Citation:

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Assignee:

MITSUI CHEMICALS INC

International Classes:

B01J23/44; B01J25/02; C07B61/00; C07C227/06; C07C229/62; (IPC1-7): C07C229/62; B01J23/44; B01J25/02; C07C227/06

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