TWI781785B - Pet化學回收用離子觸媒材料的製備方法及pet化學回收方法 - Google Patents

Pet化學回收用離子觸媒材料的製備方法及pet化學回收方法 Download PDF

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TWI781785B
TWI781785B TW110137404A TW110137404A TWI781785B TW I781785 B TWI781785 B TW I781785B TW 110137404 A TW110137404 A TW 110137404A TW 110137404 A TW110137404 A TW 110137404A TW I781785 B TWI781785 B TW I781785B
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pet
catalyst material
chemical recovery
pet chemical
chloride
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TW202315680A (zh
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廖德超
徐森煌
李祐霖
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南亞塑膠工業股份有限公司
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Priority to CN202111334621.XA priority patent/CN115945222A/zh
Priority to US17/826,195 priority patent/US20230111533A1/en
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Abstract

本發明提供一種PET化學回收用離子觸媒材料的製備方法及PET化學回收方法。PET化學回收用離子觸媒材料的製備方法包括：將氯化金屬添加至烷基咪唑-氯離子液體，以形成雙烷基咪唑-四氯化金屬離子液體，並接枝於多孔性載體上。

Description

PET化學回收用離子觸媒材料的製備方法及PET化學回收方法
本發明是有關於一種PET化學回收用離子觸媒材料的製備方法及PET化學回收方法，且特別是有關於一種可除色、解聚且易回收之PET化學回收用離子觸媒材料的製備方法及PET化學回收方法。
PET(Polyethylene Terephthalate，聚對苯二甲酸乙二酯)是最為廣泛使用的塑料之一，可用於飲料與食品硬質包材以及紡織布料。基於環境保護及防止汙染的全球趨勢，許多國家政府要求公家單位及商家使用回收再製的PET產品，國際各大品牌也制定使用回收材質的目標，這些措施都推動了PET回收技術的發展。
由於市售PET包材複雜化及PET廣泛使用，導致回收操作益發複雜，因此，將使用後的PET廢塑膠回收解聚的化學回收法越來越重要。近年來，全球PET閉環式化學回收技術迅速發展， 包括溶劑輔助化學降解、生物技術降解或微波輔助化學降解的技術，皆達到試量產的開發階段，並可處理不同種類的PET廢塑膠，例如包裝材料以及紡織布料。然而，現階段的PET化學回收技術大部分皆須將解聚與除色分開處理，且存在觸媒不易回收的問題，造成成本大幅增加。
基於上述，發展出一種PET廢塑膠回收解聚的化學回收技術，可同時進行解聚與除色，並可回收觸媒，為目前所需研究的重要課題。
本發明提供一種PET化學回收用離子觸媒材料的製備方法及PET化學回收方法，可達到除色、解聚效果以及易回收目的。
本發明之PET化學回收用離子觸媒材料的製備方法包括：將氯化金屬添加至烷基咪唑-氯離子液體，以形成雙烷基咪唑-四氯化金屬離子液體，並接枝於多孔性載體上。
在本發明的一實施例中，氯化金屬包括氯化鐵、氯化鋅或氯化鈷。
在本發明的一實施例中，多孔性載體包括奈米氧化鐵、氧化矽或活性碳。
在本發明的一實施例中，多孔性載體的接枝率為6%至10%。
本發明的PET化學回收方法，以下步驟。將上述PET化 學回收用離子觸媒材料的製備方法所製備的PET化學回收用離子觸媒材料添加至PET廢料與乙二醇中，並經過加熱與攪拌，以得到解聚與脫色的BHET(bis(2-Hydroxyethyl)terephthalate，對苯二甲酸雙(2-羥乙基)酯)。之後，過濾回收所述PET化學回收用離子觸媒材料。
在本發明的一實施例中，PET廢料包括包裝材料或紡織布料。
在本發明的一實施例中，加熱溫度為180℃至210℃，攪拌速率為100rpm至150rpm，攪拌時間為3小時至6小時。
基於上述，在本發明之PET化學回收用離子觸媒材料的製備方法中，使用了多孔性材料作為載體，以強化對PET廢料(尤其是紡織布料)的除色能力，且使用了雙烷基咪唑-四氯化金屬離子液體，可增強解聚能力。如此一來，本發明以簡單的製程，即可同時達到除色、解聚效果以及易回收目的。
以下，將詳細描述本發明的實施例。然而，這些實施例為例示性，且本發明揭露不限於此。
在本文中，由「一數值至另一數值」表示的範圍，是一種避免在說明書中一一列舉該範圍中的所有數值的概要性表示方式。因此，某一特定數值範圍的記載，涵蓋該數值範圍內的任意數值以及由該數值範圍內的任意數值界定出的較小數值範圍，如同在說明書中說明文寫出該任意數值和該較小數值範圍一樣。
本發明提供一種PET化學回收用離子觸媒材料的製備方法，包括以下步驟。將氯化金屬添加至烷基咪唑-氯離子液體，以形成雙烷基咪唑-四氯化金屬離子液體，並接枝於多孔性載體上。
在本實施例中，氯化金屬可包括氯化鐵、氯化鋅或氯化鈷，但本發明並不以此為限。多孔性載體可包括奈米氧化鐵、氧化矽或活性碳，但本發明並不以此為限，且多孔性載體的接枝率為約6%至10%。
本發明也提供一種PET化學回收方法，包括以下步驟。將上述PET化學回收用離子觸媒材料的製備方法所製備的PET化學回收用離子觸媒材料添加至PET廢料與乙二醇中，並經過加熱與攪拌，以得到解聚與脫色的BHET(bis(2-Hydroxyethyl)terephthalate，對苯二甲酸雙(2-羥乙基)酯)。之後，過濾回收PET化學回收用離子觸媒材料。
在本實施例中，PET廢料可包括包裝材料或紡織布料，但本發明並不以此為限。加熱溫度例如是180℃至210℃，攪拌速率例如是100rpm至150rpm，攪拌時間例如是3小時至6小時。
經由本發明的PET化學回收方法，針對紡織布料的實驗 例中，紡織布料經解聚、純化BHET與聚合，經GPC測試解聚效率為93%，色度L介於85至90、a±1、b值介於1至4。
綜上所述，在本發明之PET化學回收用離子觸媒材料的製備方法中，使用了多孔性材料作為載體，以強化對PET廢料(尤其是紡織布料)的除色能力，且使用了雙烷基咪唑-四氯化金屬離子液體，可增強解聚能力。如此一來，本發明以簡單的製程，即可同時達到除色、解聚效果以及易回收目的，因此，可有效地改善習知PET化學回收技術須將解聚與除色分開處理的缺點以及觸媒不易回收的問題，進一步降低成本。

Claims (6)

  1. 一種PET化學回收用離子觸媒材料的製備方法，包括：將氯化金屬添加至烷基咪唑-氯離子液體，以形成雙烷基咪唑-四氯化金屬離子液體，並接枝於多孔性載體上，其中所述多孔性載體的接枝率為6%至10%。
  2. 如請求項1所述之PET化學回收用離子觸媒材料的製備方法，其中所述氯化金屬包括氯化鐵、氯化鋅或氯化鈷。
  3. 如請求項1所述之PET化學回收用離子觸媒材料的製備方法，其中所述多孔性載體包括奈米氧化鐵、氧化矽或活性碳。
  4. 一種PET化學回收方法，包括：將請求項1至請求項3中任一項所述之PET化學回收用離子觸媒材料的製備方法所製備的PET化學回收用離子觸媒材料添加至PET廢料與乙二醇中，並經過加熱與攪拌，以得到解聚與脫色的BHET(bis(2-Hydroxyethyl)terephthalate，對苯二甲酸雙(2-羥乙基)酯)；以及過濾回收所述PET化學回收用離子觸媒材料。
  5. 如請求項4所述之PET化學回收方法，其中所述PET廢料包括包裝材料或紡織布料。
  6. 如請求項4所述之PET化學回收方法，其中加熱溫度為180℃至210℃，攪拌速率為100rpm至150rpm，攪拌時間為3小時至6小時。
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