Method of purifying aromatic polycarboxylic acid

Details Method of purifying aromatic polycarboxylic acid Method of purifying aromatic polycarboxylic acid

2006-02-28

2006-02-28

Tsang, Cecilia J. (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S486000, C562S487000

Reexamination Certificate

active

07005540

ABSTRACT:
Crude polycarboxylic acid is slurried in an aqueous medium and the slurry is brought into contact with a metal catalyst while preventing catalyst components thereof from contaminating crystals. Since hydrogenation or decarbonylation of a polymerization inhibitory substance or a substance causing coloration can efficiently proceed at a low temperature while suppressing side reactions, a product having such a quality as to permit direct use thereof as such for polymerization can be obtained with good productivity. Also, since the contact temperature can be lowered, simplification of apparatus and energy saving may be attained.

REFERENCES:
patent: 5362908 (1994-11-01), Schroeder et al.
patent: 07-017903 (1995-01-01), None
patent: 2000-001456 (2000-01-01), None
patent: 2001-096157 (2001-04-01), None
patent: WO 94/20447 (1994-09-01), None
Aldrich Catalog Handbook of Fine Chemicals, p. 187, 1998-1999.

Affiliated with

Also associated with

Rating

Method of purifying aromatic polycarboxylic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of purifying aromatic polycarboxylic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of purifying aromatic polycarboxylic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3703528