A method for producing propylene oxide

The present invention discloses a process for producing propylene oxide. Into the reactor in proportion to added feed of propylene, hydrogen peroxide and a solvent such as methanol and titanium silicalite catalyst, adjusting the reactor temperature and pressure, the establishment of circulation; the starting material and the solvent from the outside of the reaction vessel was continuously fed pipe reactor to react, and then by after mixing the static mixer sufficiently fed into the reaction kettle. In the lower portion of the reaction vessel, at a certain pressure, the reaction products of ethylene oxide separated from the catalyst, propylene oxide is separated into the subsequent step, an external catalyst circulation was pumped into the autoclave reactor piping and other equipment recycled to reactor continue to participate in the reaction. A reaction kettle, an interval of 10 ~ 300s for a recoil, in order to ensure the continuity of the separation reaction. The present invention, feedstock is contacted with the catalyst sufficiently, the conversion of hydrogen peroxide ≥96%, selectivity to propylene oxide ≥95%. The reaction separation apparatus reasonable structure, a smooth reaction.