REGENERATION OF TITANIUM-CONTAINING ZEOLITE Russian patent published in 2018 - IPC B01J29/90 B01J29/89 B01J37/06 C07D301/12 C07D303/04 B01J37/10 B01J29/70 B01J35/00 B01J37/00 B01J37/02 

FIELD: chemical or physical processes.

SUBSTANCE: invention describes a method for regenerating a catalyst comprising a titanium-containing zeolite as a catalytically active material, wherein said catalyst is used in a process for producing olefin oxide, which comprises: (i) providing a mixture comprising an organic solvent, an olefin, an epoxidising agent and at least a partially dissolved potassium-containing salt; (ii) exposing the mixture provided in step (i) in a reactor to epoxidation conditions in the presence of a catalyst to produce a mixture comprising an organic solvent and olefin oxide and to obtain a catalyst containing a potassium salt precipitated thereon; said regeneration process comprising: (a) separating the mixture obtained in step (ii) from the catalyst; (b) washing the catalyst obtained in step (a) with a liquid aqueous system which contains less than 0.1 wt. % of compounds with pKa value of 8 or less; (c) optionally drying the catalyst obtained in step (b) in a gas stream containing an inert gas at a temperature below 300 °C; (d) calcining the catalyst obtained in step (b) or (c) in a gas stream containing oxygen at a temperature of at least 300 °C.

EFFECT: technical result of the disclosed process is to efficiently regenerate the catalyst for subsequent reuse in the epoxidation of olefins.

19 cl, 17 ex, 2 tbl, 6 dwg