Process to prepare .epsilon.-caprolactam

C - Chemistry – Metallurgy – 07 – D

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C07D 201/08 (2006.01)

Patent

CA 2281981

Process to prepare .epsilon.-caprolactam by treating 6-aminocaproic acid, 6- aminocaproate ester or 6-aminocaproamide or mixtures comprising at least two of these compounds in the presence of superheated steam in which a gaseous mixture comprising .epsilon.-caprolactam and steam is obtained, wherein the process is carried out in the absence of a catalysts at a temperature between 250 and 400 ~C and at a pressure of between 0.5 and 2 MPa. The invention also encompasses a process to prepare .epsilon.-caprolactam starting from 6- aminocapronitrile by performing a hydrolysis and a subsequent step as described above.

La présente invention concerne un procédé de préparation de .epsilon.-caprolactame par traitement portant sur de l'acide 6-aminocaproïque, du 6-aminocaproate ester, ou du 6-aminocaproamide ou certains de leurs mélanges comportant au moins deux de ces composés, en présence de vapeur surchauffée, ce procédé aboutissant à l'obtention d'un mélange gazeux composé d'.epsilon.-caprolactame et de vapeur. Ce procédé convient en l'absence de catalyseur, dans des conditions de température et de pression respectivement comprises entre 250 ·C et 400 ·C et 0,5 à 2 MPa. L'invention concerne également un procédé de préparation d'.epsilon.-caprolactame à partir de 6-aminocapronitrile en réalisant d'abord une hydrolyse, et en menant ensuite les opérations précédemment décrites.

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