公开(公告)号：US10807961B2

公开(公告)日：2020-10-20

申请号：US16320329

申请日：2017-07-25

申请人： Sumitomo Chemical Company, Limited

发明人： Hirofumi Koike ,  Tomonori Kawabata ,  Takuo Takemoto ,  Motoshi Nakamura ,  Satoru Takemoto

IPC分类号： C07D303/04 ,  B01J21/08 ,  C07D301/19 ,  C07D301/32 ,  C07D301/08

摘要： A method for producing propylene oxide involves an oxidation step, a distillation step, an epoxidation step, and a separation step. The distillation step involves distilling the reaction mixture containing cumene hydroperoxide to separate it into a concentrate containing cumene hydroperoxide and a distillate. The reaction mixture is continuously distilled so that the ratio of the flow rate of the distillate to the flow rate of the reaction mixture to be distilled is 0.037 to 0.13. The epoxidation step involves obtaining a reaction mixture containing propylene oxide and cumyl alcohol by contacting the concentrate with propylene in the presence of a catalyst in one or more reactors to cause a reaction between propylene and cumene hydroperoxide in the concentrate, in which the outlet temperature of the final reactor is adjusted to 115° C. or more and less than 140° C.