Process for purifying PPPBP

Details Process for purifying PPPBP Process for purifying PPPBP

2011-02-08

2011-02-08

Powers, Fiona T (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07884220

ABSTRACT:
A method for decoloring 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (“p,p-PPPBP”) is disclosed. The method comprises contacting a liquid solution containing p,p-PPPBP and the common impurities o,p-PPPBP and aminophenone with activated carbon fibers. The activated carbon fibers adsorb the impurities, resulting in a purified solution of p,p-PPPBP. The activated carbon fibers can then be regenerated, such as with a methanol solution having a highly basic pH.

REFERENCES:
patent: 5310593 (1994-05-01), Tsujimoto et al.
patent: 5344910 (1994-09-01), Sybert
patent: 5980612 (1999-11-01), Kelly
patent: 6423657 (2002-07-01), Wang et al.
patent: 7135577 (2006-11-01), Rai et al.
patent: 7563817 (2009-07-01), Ganesan et al.
patent: 2005/0222334 (2005-10-01), Srinivasan et al.
patent: 2005/0228137 (2005-10-01), Srinivasan et al.
patent: 2005/0288517 (2005-12-01), Rai et al.
patent: 2007/0010619 (2007-01-01), Chatterjee et al.
patent: 2008/0033123 (2008-02-01), Srinivasan et al.
patent: 2008/0058497 (2008-03-01), Ganesan et al.
patent: 2008/0242873 (2008-10-01), Basale et al.
patent: 2008/0286193 (2008-11-01), Bento et al.
patent: 1582549 (2005-10-01), None
patent: 1519027 (1968-03-01), None
patent: 60-211000 (1985-10-01), None
patent: 2007070528 (2007-06-01), None
Bajaj et al., “PAN-based Activated Carbon Fibers: Production, Characterization and Applications”, Chemical Abstracts, 128:168596, 1998.
Tanaka, Eiji, “Decolorization of Sugar Syrups”, Chemical Abstracts, 104:90871, 1986.
Yang, Chin-Ping and Lin, Jiun-Hung, “Syntheses and Properties of Aromatic Polyamides and Polyimides Based on N-Phenyl-3,3-Bis[4-(p-aminophenoxy)phenyl]phthalimidine”, Journal of Polymer Science, Part A: Polymer Chemistry Edition 32 (Jan. 30, 1994), No. 2, New York, US, John Wiley & Sons, Inc. (pp. 369-382).
International Search Report for PCT/US2007/072840 International Filing Date May 7, 2007, Mailing Date Feb. 18, 2008 (6 pages).
Written Opinion of the International Searching Authority for PCT/US2007/072840 International Filing Date May 7, 2007, Mailing Date Feb. 18, 2008 (7 pages).

Affiliated with

Also associated with

Rating

Process for purifying PPPBP 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 purifying PPPBP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for purifying PPPBP will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2638029