Patent ID: 8481764

Claim:
A process for producing propylene oxide, which comprises supplying an organic hydroperoxide and propylene to an epoxidation reactor in which a solid catalyst is packed thereby continuously producing propylene oxide through epoxidation reaction, wherein said process comprises cooling at least a part of the propylene before supplying to separate and remove water contained in the propylene, and supplying the propylene in which water has been separated and removed to the epoxidation reactor, wherein the propylene to be subjected to cooling contains unreacted propylene recovered from a reaction mixture obtained after the epoxidation reaction, and the propylene to be subjected to cooling contains water and an aldehyde, wherein at least a part of the aldehyde is removed by being contained in water, the concentration of the aldehyde after separating and removing the water, is 100 ppm by weight or less, and the aldehyde is formaldehyde and/or acetaldehyde; and the solid catalyst is a titanium-containing silicon oxide catalyst.