Title:
PROCESS FOR THE RECOVERY OF NAPHTHALENEDICARBOXYLIC ACID FROM POLY(ALKYLENE NAPHTHALENEDICARBOXYLATE)
Document Type and Number:
WIPO Patent Application WO1999000351
Kind Code:
A8
Abstract:
Disclosed is a process for the recovery of naphthalenedicarboxylic acid (NDA) from polyester materials prepared from and/or containing residues of NDA such as a poly(alkylene naphthalenedicarboxylate). In one embodiment, the process comprises contacting a polyester material prepared from and/or containing residues of NDA with water at a temperature of about 125 to 400 DEG C in a pressured vessel to obtain an aqueous slurry of NDA and recovering the NDA. A second embodiment of the process comprises contacting such a polyester with an aqueous, alkali metal base solution to obtain an aqueous solution of a di-akali metal naphthalenedicarboxylate salt, then neutralizing the aqueous solution with an acid to obtain an aqueous slurry or dispersoin of NDA and recovering the NDA. The process is particularly useful for recovering 2,6-naphthalenedicarboxylic acid (2,6-NDA) from poly(ethylene naphthalenedicarboxylate) polyesters.
Inventors:
LONG TIMOTHY EDWARD
HUDNALL PHILLIP MONTGOMERY
BRADLEY JAMES RODNEY
HUDNALL PHILLIP MONTGOMERY
BRADLEY JAMES RODNEY
Application Number:
PCT/US1998/013674
Publication Date:
April 01, 1999
Filing Date:
June 30, 1998
Export Citation:
Assignee:
EASTMAN CHEM CO (US)
International Classes:
C07C51/09; (IPC1-7): C07C51/09; C07C63/38
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