Preparation of on-spec phthalic anhydride

Preparation of on-spec phthalic anhydride

A process for the preparation of on-spec phthalic anhydride by distillative purification of crude phthalic anhydride, where crude phthalic anhydride is passed to a distillation column which is operated at reduced pressure, the low-boiling components are removed at the top or in the vicinity of the t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: RUHL, THOMAS, DISTELDORF, WALTER, MORSBACH, BERND, KUMMER, MATTHIAS, PETERS, JARREN
Format: Patent
Sprache:eng
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Beschreibung
Zusammenfassung:A process for the preparation of on-spec phthalic anhydride by distillative purification of crude phthalic anhydride, where crude phthalic anhydride is passed to a distillation column which is operated at reduced pressure, the low-boiling components are removed at the top or in the vicinity of the top of the distillation column and the on-spec phthalic anhydride is removed from the column via a side take-off, by operating the column at a reflux ratio x where 1/3 < x < 1/1.7.