Process for the synthesis of epsilon-caprolactam

Details Process for the synthesis of epsilon-caprolactam Process for the synthesis of epsilon-caprolactam

1988-03-07

1988-12-06

Bond, Robert T.

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

Organic compounds

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

C07D20104

Patent

active

047897414

ABSTRACT:
The invention concerns a two-step process for the synthesis of caprolactam by reaction of cylcohexanone-oxime with an excess of oleum, carried out in a first step with only a portion of the oxime and in the presence of liquid SO.sub.2, according to usual "cold" techniques, the amount of free SO.sub.3 in the oleum being equal to or greater than 50% by weight, wherein said "cold" step is completed by a second "hot" step, by adding a second portion of oxime, the ratio between said second portion and said first portion ranging from 0.5 to 1.2.

REFERENCES:
patent: 2716114 (1955-08-01), Blaser et al.

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