METHOD FOR REFINING 2,6-NAPHTHALENE DICARBOXYLIC ACID

WIPO Patent Application WO2004013071

A3

The present invention relates to a method for refining 2,6-naphthalene dicarboxylic acid, and particularly to a method for refining 2,6-naphthalene dicarboxylic acid comprising recrystallizing crude 2,6-naphthalene dicarboxylic acid in the form of an amine salt using a solvent comprising a protic polar solvent selected from the group consisting of an alcohol, water, and a mixture thereof, and an acetate. In accordance with the invention, 2,6-naphthalene dicarboxylic acid can be obtained with excellent purity and color, and at the same time, it can be obtained in an economical and environmentally friendly way because the acetate, which is a byproduct of the oxidation process, is used as a solvent.

LEE JONG-IN (KR)
SHIM HYUN-SUP (KR)
SHIN YONG-JUN (KR)
ROH HANG-DUK (KR)

PCT/KR2003/000917

September 10, 2004

May 09, 2003

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SK CHEMICALS CO LTD (KR)
LEE JONG-IN (KR)
SHIM HYUN-SUP (KR)
SHIN YONG-JUN (KR)
ROH HANG-DUK (KR)

C07C51/42; C07C51/43; C07C51/487; C07C63/38; (IPC1-7): C07C63/38; C07C51/43

WO1998012157A2

1998-03-26

US6291707B1	2001-09-18
US5344969A	1994-09-06
EP1055660A1	2000-11-29

PATENT ABSTRACTS OF JAPAN
CHEMICAL ABSTRACTS, vol. 138, no. 18, 5 May 2003, Columbus, Ohio, US; abstract no. 273227U, JIAO N. ET AL.: "Advances in synthesis and purification technology of 2,6-naphthalenedicarboxylic acid" page 1010; column 1011; XP008046862

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