Maleic anhydride production with recycle treatment

Details Maleic anhydride production with recycle treatment Maleic anhydride production with recycle treatment

C - Chemistry, Metallurgy

07

D

260/365.7

C07D 307/60 (2006.01) C07C 51/215 (2006.01) C07C 51/25 (2006.01)

Patent

CA 1093566

ABSTRACT OF THE DISCLOSURE MALEIC ANHYDRIDE PRODUCTION WITH RECYCLE TREATMENT A process for producing maleic anhydride from a C4 hydrocarbon selected from n-butane and n-butene feed which comprises: (a) feeding the C4 hydrocarbon and air to a reactor; (b) contacting the C4 hydrocarbon and air in the reactor with a catalyst comprising vanadium and phosphorus oxides at reaction conditions including a temperature between 550 and 1000°F so as to obtain a reactor effluent containing maleic anhydride, unreacted butane, nitrogen, oxygen, and acrylic, acetic or maleic acid or mixtures of the foregoing acids; (c) removing maleic anhydride from the reactor effluent to obtain maleic anhydride- lean effluent; (d) removing said acids from at least a portion of the maleic anhydride-1ean effluent to obtain a purified recycle stream containing less than 100 ppm of the acids; and (e) recycling the purified stream to the reactor. Preferably the acids are removed in step (d) by water and/or caustic scrubbing the maleic anhydride-lean effluent.

267822

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