C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
202/91
C07D 201/16 (2006.01)
Patent
CA 1216813
ABSTRACT This invention is a method of purifying crude caprolactam. The improved method comprises taking a portion of a process stream of crude caprolactam having low boiling impurities and distilling the stream in the presence of water by fractional distillation into an overhead containing water and low boiling impurities and bottoms of caprolactam having improved purity and low water content. The improvement also comprises taking a low water content stream of crude caprolactam having low boiling impurities and adding water to the stream and distilling the stream by fractional distillation as described above.
460839
Crescentini Lamberto
Decaprio Joseph D.
Fisher William B.
Lilley Roy J. Jr.
Allied Corporation
Gowling Lafleur Henderson Llp
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