Phthalic Anhydride → Naphthalene

Participants

Reaction Steps

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.

Provenance & Evidence