Process for the preparation of a mixture of...

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C - Chemistry, Metallurgy

07

D

C07D 223/10 (2006.01) C07C 227/18 (2006.01) C07C 229/08 (2006.01) C07C 231/08 (2006.01) C07C 237/06 (2006.01) C07D 201/08 (2006.01) C07D 201/12 (2006.01)

Patent

CA 2247459

Process for the preparation of a mixture of .epsilon.-caprolactam, 6- aminocaproic acid and 6-aminocaproic amide by heating an aqueous mixture containing ammonia and oligomers of 6-aminocaproic acid and/or of 6- aminocaproic amide, the aqueous mixture containing 0.5-7 wt.% of equivalent ammonia (calculated as NH3) and the temperature lying between 280 °C and 330 °C, in which by "equivalent ammonia" is meant free ammonia and ammonia present in the form of a terminal amide group of one of the compounds present in the aqueous mixture.

Ce procédé de préparation d'un mélange de epsilon -caprolactame, d'acide 6-aminocaproïque et d'amide 6-aminocaproïque, consiste à chauffer, à une température se situant entre 280 et 330 DEG C, un mélange aqueux contenant de l'ammoniaque, des oligomères de l'acide 6-aminocaproïque et/ou de l'amide 6-aminocaproïque, la teneur en ammoniaque équivalente (sous la forme de NH3) étant de l'ordre de 0,5 à 7 % en poids. Par "ammoniaque équivalente" on entend ammoniaque libre et ammoniaque présente sous la forme d'un groupe amide terminal de l'un des composés du mélange aqueux.

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