Solid catalyst and process for producing unsaturated glycol...

B - Operations – Transporting – 01 – J

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B01J 23/44 (2006.01) B01J 27/057 (2006.01) C07C 67/04 (2006.01) C07C 67/055 (2006.01) C07C 69/16 (2006.01)

Patent

CA 2218216

A process for producing an unsaturated glycol diester is disclosed which comprises reacting a conjugated diene with a carboxylic acid and molecular oxygen in the presence of a solid catalyst, comprising an inorganic porous material with palladium and tellurium supported thereon as active ingredients, to thereby produce the corresponding unsaturated glycol diester. The solid catalyst, when analyzed with an X-ray microanalyzer (EPMA), has active-ingredient distributions in which: (a) at least about 80% of all palladium supported on the catalyst and at least about 75% of all tellurium supported on the catalyst are present in a surface layer extending from the outer surface of the support to a depth corresponding to about 30% of the radius of the support; and (b) at least about 50% of the palladium present in the surface layer extending from the support surface to a depth corresponding to about 30% of the radius of the support coexists with tellurium in a tellurium/palladium atomic ratio of from about 0.15 to about 0.35. This process is industrially advantageous in producing unsaturated glycol diesters while attaining a high catalytic activity.

Méthode pour préparer un diester de glycol insaturé, consistant à faire réagir une diène conjuguée avec un acide carboxylique et de l'oxygène moléculaire en présence d'un catalyseur solide constitué d'une substance minérale poreuse, support pour du palladium et du tellure, ingrédients actifs, permettant d'obtenir ainsi le diester de glycol insaturé correspondant. Par microanalyse aux rayons X (EPMA), le catalyseur solide a révélé les distributions d'ingrédients actifs suivantes : a) au moins 80 % environ de tout le palladium sur le support du catalyseur et au moins 75 % environ de tout le tellure sur le support se situent dans une couche superficielle s'étendant de la surface externe du support jusqu'à une profondeur correspondant à environ 30 % du rayon du support; b) au moins 50 % environ du palladium présent dans la couche superficielle s'étendant de la surface du support jusqu'à une profondeur correspondant à environ 30 % du rayon du support coexistent avec le tellure dans un rapport atomique approximatif de 0,15 à 0,35. Ce procédé est avantageux pour l'industrie, car il permet de produire des diesters de glycol insaturés avec un fort taux d'activité catalytique.

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