Process for purifying caprolactam

Details Process for purifying caprolactam Process for purifying caprolactam

2008-04-29

2008-04-29

Kifle, Bruck (Department: 1624)

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

Reexamination Certificate

active

10565774

ABSTRACT:
The invention relates to a process for purifying caprolactam, said process comprising (a) subjecting the caprolactam to a hydrogenation by treating the caprolactam with hydrogen in the presence of a heterogeneous nickel containing hydrogenation catalyst, (b) distilling at least a portion of the hydrogenated caprolactam in a distillation column containing nickel in an amount sufficiently low such that ΔPANNi≦3, wherein ΔPANNi=ΔPAN−ΔPANNi=0, ΔPAN=increase of the PAN number of caprolactam during distilling, ΔPANNi=0increase of the PAN number of caprolactam during distilling under the same conditions in a distillation column free of nickel. Nickel is removed from the caprolactam solution prior to the distillation step.

REFERENCES:
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Thomissen et al, U.S. Appl. No. 10/557,771, filed Nov. 29, 2006.
Smeets et al, U.S. Appl. No. 10/557,770, filed Nov. 21, 2005.

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