Process for the preparation of propylene oxide

Details Process for the preparation of propylene oxide Process for the preparation of propylene oxide

C - Chemistry, Metallurgy

07

D

260/372.3

C07D 301/12 (2006.01) C07C 409/24 (2006.01) C07D 301/14 (2006.01)

Patent

CA 1087619

Process for the preparation of propylene oxide ABSTRACT OF THE DISCLOSURE Process for continuous production of propylene oxide (Fig. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5, 12), and following dry- ing of the benzene solution (16), the perpropionic acid in the solution is reacted with propylene (18) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (25, 27, 31, 33), and the latter two are recycled. In the benzene extraction (5, 12), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst. Water is removed from the aqueous raffinate (8) and the concentrate is recycled to the propionic acid reactor. Make-up hydrogen peroxide can be added to the aqueous raffinate before the removal of water.

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