Patent ID: 7973183
Filing Date: 2011-07-05
Classification: C07D,Y02P

Abstract:
1. A continuous process for the preparation of an olefin oxide comprising a stage (a) (a) reacting an olefin with a hydroperoxide in the presence of a catalyst to obtain a mixture (Ma) comprising olefin oxide, wherein stage (a) comprises at least one reaction stage (i) wherein in (i) (1) the reaction is carried out in at least 3 reactors R1, R2, . . . Rn connected in parallel, wherein each reactor contains the catalyst and wherein the standard catalyst load LS of a given reactor deviates not more than ±5% from the average standard catalyst load LSA; (2) at any given point in time during carrying out the reaction, at least one of the at least 3 reactors R1, R2, . . . Rn is out of operation for regenerating the catalyst present in this at least one reactor so that at least 2 reactors remain in operation; and (3) at this point in time, the at least 2 reactors in operation are operated so that wherein the catalyst load L of a given reactor is the molar amount of hydroperoxide fed per kilogram catalyst and per hour into this reactor; wherein the standard catalyst load LS of a given reactor is the catalyst load which, if constantly applied for a given reaction period T to this reactor containing the catalyst, results in the maximum yield of olefin oxide based on hydroperoxide; wherein the average standard catalyst load LSA is the sum of the standard catalyst loads of all reactors R1, R2, . . . Rn divided by n; and wherein the average catalyst load LA at a given point in time is the sum of the catalyst loads of the reactors in operation at this point in time divided by the number of these reactors, wherein n is the number of reactors.