Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2006-12-26
2006-12-26
Zucker, Paul A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
Reexamination Certificate
active
07153998
ABSTRACT:
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.
REFERENCES:
patent: 5344969 (1994-09-01), Iwane et al.
patent: 5859294 (1999-01-01), Hashimoto et al.
patent: 6291707 (2001-09-01), Lin
patent: 1055660 (2000-11-01), None
patent: 07-118200 (1995-05-01), None
patent: WO 98/12157 (1998-03-01), None
Lee Jong-In
Roh Hang-Duk
Shim Hyun-Sup
Shin Yong-Jun
Gifford, Krass, Groh Sprinkle, Anderson & Citkowski, P.C.
SK Chemical Co., Ltd.
Zucker Paul A.
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