Preparation of substantially anhydrous propylene oxide

Details Preparation of substantially anhydrous propylene oxide Preparation of substantially anhydrous propylene oxide

C - Chemistry, Metallurgy

07

D

C07D 303/04 (2006.01) C07D 301/32 (2006.01)

Patent

CA 2142062

In a distillation method for the purification of crude propylene oxide containing contaminating quantities of water and methanol wherein the crude propylene oxide is partially purified in a plural stage distillation zone to provide a vaporized overhead distillate propylene oxide fraction consisting essentially of propylene oxide and a minor contami- nating amount of vaporized water, the improvement which comprises the step of: passing said propylene oxide vapor fraction through a drying chamber containing a porous hygroscopic solid absorbent to selectively absorb water vapor onto the absorbent, and liquefying and recovering the thus-dehydrated purified propylene oxide.

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