Ionic liquids/ZnO nanoparticles as recyclable catalyst for polycarbonate depolymerization

IF 5.062 Journal of Molecular Catalysis A: Chemical Pub Date : 2017-01-01 DOI:10.1016/j.molcata.2016.11.006

Francesco Iannone , Michele Casiello , Antonio Monopoli , Pietro Cotugno , Maria Chiara Sportelli , Rosaria Anna Picca , Nicola Cioffi , Maria M. Dell’Anna , Angelo Nacci

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引用次数: 76

Abstract

A useful protocol for waste bis-phenol A-polycarbonates (BPA-PC) chemical recycling is proposed based on a bifunctional acid/basic catalyst composed by nanostructured zinc oxide and tetrabutylammonium chloride (ZnO-NPs/NBu₄Cl) in quality of Lewis acid and base, respectively. Retro-polymerization reaction proved to be of general application for several nucleophiles, including water, alcohols, amines, polyols, aminols and polyamines, leading to the complete recovery of BPA monomer and enabling the PC polymer to function as a green carbonylating agent (green phosgene alternative) for preparing carbonates, urethanes and ureas. A complete depolymerization can be obtained in seven hours at 100 °C and ZnO nanocatalyst can be recycled several times without sensible loss of activity. Remarkably, when polycarbonate is reacted with glycerol, it is possible to realize in a single process the conversion of two industrial wastes (BPA-PC and glycerol) into two valuable chemicals like BPA monomer and glycerol carbonate (the latter being a useful industrial solvent and fuel additive).

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离子液体/ZnO纳米颗粒作为聚碳酸酯解聚的可回收催化剂

基于纳米氧化锌和四丁基氯化铵(ZnO-NPs/NBu4Cl)组成的双功能酸/碱催化剂，提出了一种有效的双酚A-聚碳酸酯(BPA-PC)废弃物化学回收方案。反聚合反应被证明是几种亲核试剂的普遍应用，包括水、醇、胺、多元醇、胺和多胺，导致双酚a单体的完全回收，使PC聚合物作为绿色羰基化剂(绿色光气替代品)用于制备碳酸盐、聚氨酯和尿素。在100℃条件下，7小时内可实现完全解聚，且氧化锌纳米催化剂可多次循环使用，且活性无明显损失。值得注意的是，当聚碳酸酯与甘油反应时，有可能在一个过程中将两种工业废物(BPA- pc和甘油)转化为两种有价值的化学物质，如BPA单体和碳酸甘油(后者是一种有用的工业溶剂和燃料添加剂)。

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来源期刊

Journal of Molecular Catalysis A: Chemical 化学-物理化学

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审稿时长

2.8 months

期刊介绍： The Journal of Molecular Catalysis A: Chemical publishes original, rigorous, and scholarly full papers that examine the molecular and atomic aspects of catalytic activation and reaction mechanisms in homogeneous catalysis, heterogeneous catalysis (including supported organometallic catalysis), and computational catalysis.