AN ACID WASHED ADSORBENT CARBON USED IN A METHOD FOR THE PURIFICATION OF ACETAMINOPHEN

An acid washed adsorbent carbon which has been contacted with an aqueous solution of a reducing sulfite is provided which may be used in a method for purifying a crude N-acetyl-para-aminophenol (APAP) containing color bodies or their precursors, the method comprising: a) forming a hot aqueous soluti...

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Bibliographic Details
Main Authors WHEELER, LARRY O, FRUCHEY, OLAN STANLEY, ZEY, EDWARD G
Format Patent
LanguageEnglish
French
Published 27.01.2004
Edition7
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:An acid washed adsorbent carbon which has been contacted with an aqueous solution of a reducing sulfite is provided which may be used in a method 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.
Bibliography:Application Number: CA19912413901