PROCESS FOR PRODUCING PROPYLENE OXIDE Russian patent published in 2018 - IPC C07D301/12 C07D301/36 C07D303/04 B01J29/70 B01J29/89 B01J27/18 B01J37/02 B01J37/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a continuous process for the production of propylene oxide which comprises (i) providing a liquid feed stream comprising propene, hydrogen peroxide, acetonitrile, water, dissolved potassium dihydrogen phosphate, and optionally propane; (ii) passing the liquid feed stream provided in (i) into an epoxidation reactor comprising a catalyst comprising a titanium zeolite of structure type MWW, and subjecting the liquid feed stream to epoxidation reaction conditions; (iii) removing an effluent stream from the epoxidation reactor. In accordance with the invention, the concentration of the dissolved potassium dihydrogen phosphate in the liquid feed stream in step (i) is at least 10 % of the solubility limit of potassium dihydrogen phosphate in the liquid feed stream and the titanium zeolite of structure type MWW contained in step (ii), contains zinc. Invention also relates to a catalyst system for producing propylene oxide.

EFFECT: technical result is a high selectivity of the process with respect to propylene oxide, a high degree of conversion of hydrogen peroxide and a long operating time of the catalyst without deactivation.

23 cl, 4 tbl, 4 ex