Process for the separation of phthalic anhydride contained in the reaction of the catalytic oxidation of the o - xylene or naphthalene

摘要

P for continuously separating the phthalic anhydride contained in the reaction gases of the oxidation. catalyst of the o - xylene and / or naphthalene these gases are treated with maleic anhydride, which may contain up to 85% by weight of phthalic anhydride in an absorption column 2, it is discharged out of the absorption zone of the charged absorbent of phthalic anhydride, it separates the absorbent agent and phthalic anhydride in the vacuum distillation column 5 and is recycled to the absorbent agent in the absorption zone 2b. / p