The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2001
Filed:
Jul. 30, 1999
Applicant:
Inventors:
Olan Stanley Fruchey, Bad Soden/T.S, DE;
Edward G. Zey, Corpus Christi, TX (US);
Larry O. Wheeler, Corpus Christi, TX (US);
Assignee:
BASF Corporation, Mount Olive, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J 2/002 ;
U.S. Cl.
CPC ...
B01J 2/002 ;
Abstract
A method is provided for purifying a crude N-acetyl-para-aminophenol (APAP) containing color bodies or their precursors, the method comprising: a) forming a hot aqueous solution of the crude APAP; and b) subsequently contacting the hot solution with an acid washed adsorbent carbon, e.g., an activated carbon, which acid washed carbon, prior to such contact, has been pretreated by contacting it with an aqueous solution of a reducing sulfite.