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    • 1. 发明授权
    • Process for improving the selectivity of an EO catalyst
    • 提高EO催化剂选择性的方法
    • US09174928B2
    • 2015-11-03
    • US13456774
    • 2012-04-26
    • Wayne Errol EvansJeffrey Michael KobeMarek Matusz
    • Wayne Errol EvansJeffrey Michael KobeMarek Matusz
    • C07D301/03C07C213/04C07D301/12
    • C07C213/04C07D301/12Y02P20/52C07C215/08
    • Processes for the epoxidation of ethylene are provided in which, following start-up, an epoxidation catalyst is contacted with a feed comprising ethylene, oxygen, carbon dioxide in an amount below 2.0 vol. %, and a chloride moderator to achieve a desired work rate at a first operating temperature T1. The composition of the feed is subsequently adjusted (e.g., by decreasing the ethylene concentration, decreasing the oxygen concentration, increasing the carbon dioxide concentration and/or adjusting the concentration of the chloride moderator) so as to increase the first operating temperature T1 to a second operating temperature T2 while maintaining the desired work rate. As the catalyst activity declines, the composition of the feed is further adjusted so as to maintain the desired work rate at the second operating temperature T2.
    • 提供了用于环氧化乙烯的方法,其中在启动之后,将环氧化催化剂与包含乙烯,氧,二氧化碳的进料接触,其量低于2.0体积%。 %和氯化物调节剂,以在第一工作温度T1达到所需的加工速率。 随后调整进料的组成(例如,通过降低乙烯浓度,降低氧浓度,增加二氧化碳浓度和/或调节氯化物调节剂的浓度),以便将第一操作温度T1增加至第二 工作温度T2,同时保持所需的工作速率。 随着催化剂活性的降低,进料的组成进一步调节,以便在第二工作温度T2保持所需的加工速率。