Improved poly ethylene terephthalate decontamination

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 11/00 (2006.01) C07C 51/09 (2006.01) C07C 63/26 (2006.01) C07C 67/02 (2006.01) C07C 67/03 (2006.01) C07C 69/82 (2006.01) C08J 11/06 (2006.01) C08J 11/18 (2006.01)

Patent

CA 2136080

A process For removing contaminants from PET components by, depolymerising poly ethylene terephthalate ("PET") corraprising transesterifying material containing PET by reacting ethanediol having a temperature at or about the boiling point of ethanediol with the material for a predetermined period of time to form a solution containing soluble short chain PET polymers and/or bis (hydroxy ethyl) terephthalate ester ("BHT"); recovering short chain PET polymers and/or BHT and ethanediol; and hydrolysing the recovered short chain PET polymers and/or BHT at elevated pressure and temperature for a predetermined period of time to form an ethanediol solution and crystals of terephthalic acid.

L'invention décrit un procédé pour éliminer les contaminants des composants en PET, en dépolymérisant le téréphtalate de polyéthylène (PET). Le procédé comprend la transestérification du matériau contenant le PET en faisant réagir l'éthanediol ayant une température proche de son point d'ébullition avec le matériau, pendant un temps prédéterminé de manière à former une solution contenant des polymères PET à chaîne courte solubles et/ou un ester bistéréphtalate (hydroxy éthyle) (BHT); la récupération des polymères PET à chaîne courte et/ou du BHT et de l'éthanediol; et l'hydrolyse des polymères PET à chaîne courte et/ou du BHT récupérés à pression et température élevées pendant un temps prédéterminé pour former une solution d'éthanediol et des cristaux d'acide téréphtalique.

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