PROPYLENE OXIDE PRODUCTION METHOD Russian patent published in 2020 - IPC C07D301/19 C07D301/32 C07D303/04 

FIELD: chemical or physical processes.

SUBSTANCE: present invention relates to a method of producing propylene oxide, comprising steps (1)–(4): (1)—oxidation station: step for producing a reaction mixture containing cumene hydroperoxide, by contacting cumene with an oxygen-containing gas to cause a reaction between cumene and oxygen in said gas; (2)—distillation stage: reaction mixture distillation stage, containing cumene hydroperoxide obtained at the oxidation step for its separation into a concentrate containing cumene hydroperoxide, and a distillate, on which the reaction mixture is continuously distilled under the condition that the ratio of the flow rate of the distillate (D) to the flow rate of the distillation reaction mixture (F), D/F, is 0.037 or higher and 0.13 or less, where the flow rate of the reaction mixture is a weight of the reaction mixture distilled per unit time, while flow rate of distillate is weight of distillate distilled per unit time; (3)—epoxidation step: a step for producing a reaction mixture containing propylene oxide and cumyl alcohol, by contacting a concentrate containing cumene hydroperoxide obtained at the distillation step with propylene in the presence of a catalyst in one or more reactors in order to cause reaction between propylene and cumene hydroperoxide in concentrate, wherein temperature at outlet of final reactor from said one or more reactors is maintained in range of 115 °C or more and less than 140 °C; and (4) a separation step: a step for separating crude propylene oxide by distillation of a reaction mixture containing propylene oxide and cumyl alcohol obtained at the epoxidation step.

EFFECT: disclosed method reduces concentration of methyl formate in the reaction mixture obtained at the epoxidation step.

3 cl, 10 ex, 1 dwg