Process for the purification of n-caprolactam

Details Process for the purification of n-caprolactam Process for the purification of n-caprolactam

C - Chemistry, Metallurgy

07

D

202/88

C07D 201/16 (2006.01) B01D 3/14 (2006.01)

Patent

CA 1182775

ABSTRACT 1. Process for the purification of .epsilon.-caprolactam, obtained through rearrangement of cyclohexanone oxime by means of sulphuric acid or oleum, by subjecting the caprolactam to be purified to distilla- tion under reduced pressure, with separation of low-boiling and high-boiling impurities. The distillation is carried out in two steps with at least in the 1st step an evaporator with a rec- tification column containing packing material with a pressure drop of less than 2.5 mbar per theoretical tray. The caprolactam to be purified is supplied to the rectification column of the 1st step, the low-boiling impurities are carried off from this column, the bottom product remaining in the 1st step is supplied to the 2nd step and in this step the high-boiling impurities are carried off as bottom product. The purified caprolactam is recovered as top product.

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