Device and method for removing gas from polycarbonate solutions containing solution

The device has a down pipe evaporator (15) combined with an evaporating extruder i.e. double screw extruder. The down pipe evaporator is directly arranged over the extruder, and water vapor lines (17) are attached to the down pipe evaporator. The evaporator consists of a tube bundle-heat exchanger w...

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Bibliographische Detailangaben
Hauptverfasser:	DE CLEYN, RENE, KOENIG, THOMAS, VANDEN EYNDE, JOHAN, VAES, JOHAN, VAN MEIRVENNE, DIRK, KOHLGRUEBER, KLEMENS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The device has a down pipe evaporator (15) combined with an evaporating extruder i.e. double screw extruder. The down pipe evaporator is directly arranged over the extruder, and water vapor lines (17) are attached to the down pipe evaporator. The evaporator consists of a tube bundle-heat exchanger with tubes, which are heated outwardly. The extruder comprises degassing zones in a conveyor direction. The down pipe evaporator is heated by condensed water vapor by a condensed organic heat medium or a fluid organic heat medium. An independent claim is also included for a method for removing gas from polycarbonate solutions containing solution. Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Entgasen von lösungsmittelhaltigen Polycarbonatlösungen. Durch Anwendung der erfindungsgemäßen Vorrichtung werden Polycarbonate mit niedrigen Restwerte an flüchtiger Bestandteile aus lösungsmittelhaltigen Polymerschmelzen hergestellt, die verbesserte optische Eigenschaften, insbesondere Yellowness Index, mit Hilfe einer Apparate-Kombination aus einem beheizbaren Rohrverdampfer und einem Ausdampfextruder.