An epoxidation catalyst, a process for preparing the...

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B01J 23/68 (2006.01) C07C 29/10 (2006.01) C07C 68/06 (2006.01) C07C 213/04 (2006.01) C07D 301/10 (2006.01)

Patent

CA 2685512

A catalyst for the epoxidation of an olefin comprising a carrier and, deposited on the carrier, silver, a rhenium promoter, a first co-promoter, and a second co-promoter; wherein the quantity of the rhenium promoter deposited on the carrier is greater than 1 mmole/kg, relative to the weight of the catalyst; the first co-promoter is selected from sulfur, phosphorus, boron, and mixtures thereof; the second co-promoter is selected from tungsten, molybdenum, chromium, and mixtures thereof; and the total quantity of the first co-promoter and the second co-promoter deposited on the carrier is at most 3.8 mmole/kg, relative to the weight of the catalyst; a process for preparing the catalyst; a process for preparing an olefin oxide by reacting a feed comprising an olefin and oxygen in the presence of the catalyst; and a process for preparing a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, or an alkanolamine.

L'invention concerne un catalyseur d'époxydation d'une oléfine qui comprend un support et, déposé sur le support, de l'argent, un promoteur de rhénium, un premier co-promoteur et un second co-promoteur; la quantité de promoteur de rhénium déposée sur le support est supérieure de 1 mmole/kg, par rapport au poids du catalyseur; le premier co-promoteur est sélectionné parmi le soufre, le phosphore, le bore et des mélanges de ceux-ci; le second promoteur est sélectionné parmi le tungstène, le molybdène, le chrome et des mélanges de ceux-ci; et la quantité totale du premier et du second co-promoteur déposé sur le support équivaut au plus à 3,8 mmole/kg, par rapport au poids du catalyseur; un procédé de préparation d'un oxyde d'oléfine par mise en réaction d'une charge contenant une oléfine et de l'oxygène en présence du catalyseur; et un procédé de préparation d'un 1,2-diol, d'un éther de 1,2-diol, d'un 1,2-carbonate ou d'une alcanolamine.

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