Process for the synthesis of epsilon-caprolactam

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

C - Chemistry, Metallurgy

07

D

260/241.75

C07D 223/10 (2006.01) B01J 19/26 (2006.01) C07D 201/04 (2006.01)

Patent

CA 1307261

ABSTRACT The invention concerns a two-step process for the synthesis of caprolactam by reaction of cyclohexanone-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 S02, according to usual "cold" techniques, the amount of free S03 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.

560738

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