METHOD FOR PREPARING RECYCLED BIS(2-HYDROXYETHYL) TEREPHTHALATE THROUGH MULTI-STEP DEPOLYMERIZATION
A method, according to one embodiment, depolymerizes waste polyester by means of a multi-step reaction, wherein a latter reaction is carried out at a low temperature, and ion exchange, etc., is further carried out, thereby enabling the provision of high-purity and high-quality recycled bis(2-hydroxy...
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| Format: | Patent |
| Sprache: | eng ; fre ; kor |
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| Zusammenfassung: | A method, according to one embodiment, depolymerizes waste polyester by means of a multi-step reaction, wherein a latter reaction is carried out at a low temperature, and ion exchange, etc., is further carried out, thereby enabling the provision of high-purity and high-quality recycled bis(2-hydroxyethyl) terephthalate having reduced generation of diethylene glycol-derived impurities and oligomers.
Selon un mode de réalisation de la présente invention, un procédé dépolymérise des déchets de polyester au moyen d'une réaction en plusieurs étapes, une dernière réaction étant effectuée à basse température, et l'échange d'ions, etc. étant en outre mis en œuvre, ce qui permet d'obtenir du téréphtalate de bis(2-hydroxyéthyl) recyclé de haute pureté et de qualité élevée ayant une génération réduite d'impuretés et d'oligomères dérivés de diéthylène glycol.
일 구현예에 따른 방법은 폐 폴리에스테르를 다단 반응으로 해중합하되 후단 반응을 저온에서 수행하고 이온교환 등을 더 거침으로써, 디에틸렌글리콜 유래 불순물과 올리고머류의 발생이 저감된 고순도 및 고품질의 재생 비스(2-히드록시에틸)테레프탈레이트를 제공할 수 있다. |
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