Method for the purification of acetaminophen

Details Method for the purification of acetaminophen Method for the purification of acetaminophen

1994-03-15

1999-11-09

Kumar, Shailendra

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

Organic compounds

Amino nitrogen containing

564223, C07C23124

Patent

active

059817992

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.

REFERENCES:
patent: 3042719 (1962-07-01), Hahn
patent: 3113150 (1963-12-01), Young
patent: 3748358 (1973-07-01), Baron
patent: 3781354 (1973-12-01), Kosak
patent: 4524217 (1985-06-01), Davenport et al.

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