Process for the recovery of maleic anhydride from distillation residues

摘要

A process for the recovery of maleic anhydride from distillation residues containing the same is described whereby a residue containing phthalic anhydride is added to the residue of maleic anhydride prior to or after distillation of the maleic anhydride residue. By such a process maleic anhydride recovery is improved and the distillation residue remaining from distillation of the maleic anhydride out of the maleic anhydride residue remains removable by simple mechanical means from the distillation vessel.