Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1997-05-19
1998-06-23
Barts, Samuel
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562414, 562416, C07C 5116
Patent
active
057707642
ABSTRACT:
Economical processes are disclosed for preparing relatively pure polycarboxylic acid from typical crude products of liquid phase oxidation, which do not involve intermediate steps of ester formation or require any alkanol containing solvent, for purification of "crude" polycarboxylic acid containing impurities which include one or more monofunctional aromatic compounds, trifunctional aromatic compounds, and/or color causing organic compounds formed by oxidation of a corresponding substituted aromatic compound in a liquid phase, e.g. 2,6-naphthalene dicarboxylic acid by liquid phase oxidation of 2,6-dimethyl naphthalene. The invention provides integrate processes which comprise reacting crude oxidation product with a polyalkyl amine amine, e.g. trialkylamine, forming an aqueous solution of the salts thus obtained, separating deleterious compounds from the solution, and recovering the polyalkyl amine and a relatively pure polycarboxylic acid product.
REFERENCES:
patent: 3870754 (1975-03-01), Yamashita et al.
patent: 4933491 (1990-06-01), Albertins et al.
patent: 4950786 (1990-08-01), Sanchez et al.
patent: 5262560 (1993-11-01), Behrends et al.
Behrens Paul K.
Hoover Stephen V.
Sikkenga David L.
Zeitlin Martin A.
Amoco Corporation
Barts Samuel
McDonald Scott P.
Nemo Thomas E.
Oliver Wallace L.
LandOfFree
Process for preparing purified aromatic polycarboxylic acids does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing purified aromatic polycarboxylic acids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing purified aromatic polycarboxylic acids will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1395906