Process for producing propylene oxide

C - Chemistry – Metallurgy – 07 – D

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C07D 301/19 (2006.01) C07B 61/00 (2006.01) C07D 303/04 (2006.01)

Patent

CA 2402739

A process for producing propylene oxide, characterized in that it comprises the following steps and the concentration of water in the isopropylbenzene hydroperoxide solution to be subjected to the epoxidization step is 1 wt.% or lower. Oxidation step: a step in which isopropylbenzene is oxidized to obtain isopropylbenzene hydroperoxide. Epoxidization step: a step in which the isopropylbenzene hydroperoxide obtained in the oxidation step is reacted with propylene to obtain propylene oxide and cumyl alcohol. Hydrogenolysis step: a step in which the cumyl alcohol obtained in the epoxidization step is subjected to hydrogenolysis to obtain isopropylbenzene, and the isopropylbenzene is recycled as a feed material to the oxidation step.

L'invention concerne un procédé de production d'oxyde de propylène, caractérisé en ce qu'il comprend plusieurs étapes décrites ci-dessous et la concentration de l'eau dans la solution d'hydroperoxyde isopropylbenzène à soumettre à l'étape d'époxydation est inférieure ou égale à 1 % en poids. L'étape d'oxydation : une étape au cours de laquelle l'isopropylbenzène est oxydé afin d'obtenir de l'hydroperoxyde isopropylbenzène. L'étape d'époxydation : une étape au cours de laquelle l'hydroperoxyde isopropylbenzène obtenu lors de l'étape d'oxydation est mis en réaction avec le propylène afin d'obtenir de l'oxyde de propylène et de l'alcool de cumyle. L'étape d'hydrogénolyse : une étape au cours de laquelle l'alcool de cumyle obtenu lors de l'étape d'époxydation est soumis à l'hydrogénolyse, afin d'obtenir un isopropylbenzène, lequel est recyclé en tant que substance de base vers l'étape d'oxydation.

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