IMPROVED METHOD FOR DEPOLYMERISING POLYETHYLENE TEREPHTHALATE

The invention relates to a method for depolymerising polyethylene terephthalate ("PET"), in which PET is reacted with electrolytically prepared alkali metal glycolate, in particular sodium or potassium glycolate, to form a mixture M1 comprising bis(2-hydroxyethyl) terephthalate ("BHET...

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Bibliographische Detailangaben
Hauptverfasser:	HORN, Michael, WEINER, Marc, REINSBERG, Philip Heinrich, RUWWE, Johannes
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The invention relates to a method for depolymerising polyethylene terephthalate ("PET"), in which PET is reacted with electrolytically prepared alkali metal glycolate, in particular sodium or potassium glycolate, to form a mixture M1 comprising bis(2-hydroxyethyl) terephthalate ("BHET"). The method according to the invention is characterised in that BHET accounts for a particularly high proportion of the breakdown products in the mixture M1. As a result, the method according to the invention provides a high yield of BHET, which can be used directly for renewed PET production. The present invention also relates to a method for recycling PET, in which the BHET obtained in the method for depolymerising PET is polymerised again to PET, optionally after further purification from M1.