Patent ID: 7754925
Filing Date: 2010-07-13
Classification: C07C

Abstract:
1. A process for reacting a composition I, comprising cyclododeca-4,8-dien-1-one obtained by reacting 1,5,9-cyclododecatriene with dinitrogen monoxide and further comprising polyunsaturated C12 aldehydes as a result of the preparation process of the cyclododeca-4,8-dien-1-one, with hydrogen in the presence of a heterogeneous Pd catalyst in a main reactor and a postreactor to afford a mixture comprising cyclododecanone, and removing the cyclododecanone from this mixture via at least one distillation; wherein at least 50% of the fresh hydrogen fed to the reaction system is fed into the postreactor; and wherein in the preparation process of the cyclododeca-4,8-dien-1-one, 1,5,9-cyclododecatriene is reacted in continuous mode with dinitrogen monoxide in a single reactor at a temperature in the range from 200 to 300° C., a pressure in the range from 50 to 200 bar and a residence time of the reactants in the range from 0.25 to 10 h, wherein in the feed which is fed to the reaction of dinitrogen monoxide with the 1,5,9-cyclododecatriene, the molar ratio of dinitrogen monoxide to 1,5,9-cyclododecatriene is in the range from 0.1 to 0.4.