Continuous isolation of phthalic anhydride and maleic...

Details Continuous isolation of phthalic anhydride and maleic... Continuous isolation of phthalic anhydride and maleic...

C - Chemistry, Metallurgy

07

D

260/374

C07D 307/60 (2006.01) C07C 51/573 (2006.01) C07D 307/89 (2006.01)

Patent

CA 1194030

ABSTRACT OF THE DISCLOSURE: A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from 115 to 175°C as the solvent in a column, and are then treated with an organic solvent of boiling range from 180 to 290°C in a second column, the phthalic anhydride and maleic anhydride being isolated from the liquid bottom product of the first column.

421118

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