Process for preparing .epsilon.-caprolactone

Details Process for preparing .epsilon.-caprolactone Process for preparing .epsilon.-caprolactone

C - Chemistry, Metallurgy

07

D

C07D 313/04 (2006.01) C07C 67/02 (2006.01)

Patent

CA 2690867

The invention relates to a method for producing .epsilon.-caprolacton at a purity of 99%, wherein 6-hydroxycaproic acid ester having 0.5 to 40 weight % adipic acid diesters is cyclisized in the gas phase at 150 to 450°C in the presence of oxidic catalysts, and .epsilon.-caprolacton is obtained by distillation of the cyclisization product.

L'invention concerne un procédé de fabrication de e-caprolactone ayant une pureté de plus de 99 %, consistant à cycliser un ester d'acide 6-hydroxycapronique contenant 0,5 à 40 % en poids de diester d'acide adipinique dans la phase gazeuse, à une température de 150 à 450 °C, en présence de catalyseurs oxydiques, et à produire du e-caprolactone à partir du produit de cyclisation par distillation.

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