METHOD FOR PRODUCING PHTHALIC ANHYDRIDE ACCORDING TO SPECIFICATIONS

The invention relates to a method for producing phthalic anhydride according to specifications by the distillative purification of crude phthalic anhydride. According to said method, crude phthalic anhydride is fed to a distillation column which is operated at a reduced pressure, then the lowboiling...

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Bibliographische Detailangaben
1. Verfasser:	BERND BESSLING
Format:	Patent
Sprache:	eng ; spa
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:	The invention relates to a method for producing phthalic anhydride according to specifications by the distillative purification of crude phthalic anhydride. According to said method, crude phthalic anhydride is fed to a distillation column which is operated at a reduced pressure, then the lowboiling constituents at the head or in the vicinity of the head of the distillation column are removed and the phthalic anhydride which conforms to specifications is recovered from the column through a lateral vent. Se prepara anhidrido ftalico de acuerdo con especificaciones por purificacion destilativa de anhidrido ftalico crudo por un proceso en el que el anhidrido ftalico crudo se alimenta a una columna de destilacion que se opera a presion reducida, las sustancias de punto de ebullicion bajo se retiran en la parte superior o en las cercanias de la parte superior de la columna de destilacion y el anhidrido ftalico de acuerdo con especificaciones se retira de la columna por una toma lateral.