Polystyrene depolymerization: Scavenging brominated flame retardants - extension

聚苯乙烯是一种用途广泛的聚合物，生产规模巨大（每年数百万吨），并应用于许多消费品，包括包装。不可生物降解的聚合物，如聚苯乙烯，是一种 ** 环境负担;高抗冲聚苯乙烯（HIPS）是电子工业的主要组成部分，** 是城市固体废物的相当大的一部分。该行业目前正试图从废聚合物和报废聚合物中获取价值，作为原料。高抗冲聚苯乙烯（HIPS）是一种含有聚丁二烯和丙烯腈丁二烯苯乙烯（ABS）的共聚物，是另一种共聚物，是电脑机箱和下水道管道的主要成分。报废聚苯乙烯共聚物含有热稳定剂、** 溴化阻燃剂、过氧化苯甲酰、三氧化锑等化合物。溴化 ** 化合物提供防火性能，满足UL或CSA防火要求。然而，许多 ** 这些化合物现在被禁止。Lavergne集团是一家主要的加拿大公司，生产聚合物和 ** 他们有大量的高抗冲聚苯乙烯供应与溴化化合物，他们必须删除，以满足联邦 ** 要求。去除这些化合物减少了聚苯乙烯对市政垃圾填埋场的负担，但将 ** 维持其客户的原料供应，因为他们有一个可行的业务运作。热裂解和热解是回收有价值的苯乙烯（单体）和碳氢化合物（例如苯）的几种技术之一。然而，我们证明了在热解之后多达20%的固体残留。此外，裂化产物与聚苯乙烯相比具有较低的价值。我们将采用高温（>200 ℃）溶剂工艺 ** 提取溴化化合物。实验计划 ** 将确定溴提取效率与时间、温度、颗粒 ** 尺寸、溶剂类型和催化剂之间的关系。我们将通过HPLC分析仪、GC-MS、FTIR分析液体产品，并通过热重分析评估固相。我们的目标是最大限度地提高聚苯乙烯产量 **（固相）小于1000 ppm溴和确定如何回收/处理可溶性化合物。

Polystyrene is a versatile polymer that is produced at enormous scale (millions of tonnes per year) and applied**in many consumer products including packaging. Nonbiodegradable polymers, like polystyrene, represent an**environmental burden; high impact polystyrene (HIPS) is a major component in the electronics industry and**represents a sizable fraction of municipal solid waste. The industry is now attempting to derive value from**waste polymer and end-of life polymer for a feedstock. High impact polystyrene (HIPS) is a copolymer that**contains polybutadiene and acrylonitrile butadiene styrene (ABS) is another copolymer that is the principal**component of computer cases and sewer pipes. End-of-life polystyrene copolymers contain thermal stabilizers,**brominated fire retardants, benzoyl peroxide, antimony trioxide, among other compounds. Brominated**compounds provide fire proof properties to meet UL or CSA fire resistance requirement. However, many of**these compounds are now banned. Lavergne Group is a major Canadian company that recycles polymers and**they have a large supply of HIPS with the brominated compounds that they must remove to meet federal**requirements. Removing these compounds reduces the burden of polystyrene to municipal landfills but will**maintain their supply of feedstock for their customers as they have a viable business operational. Thermal**cracking and pyrolysis are among several technologies to recover valuable styrene (monomer) and**hydrocarbons (benzene, for example). However, we demonstrated that as much of 20 % of the solids remained**after pyrolyis. Furthermore, the cracked products have less value compared to the polystyrene. We will pursue**extracting the brominated compounds by a high temperature (>200 oC) solvent process. The experimental plan**will identify the relationship between bromine extraction efficiency as a function of time, temperature, particle**size, solvent type, and catalyst We will analyse the liquid products by HPLC analyser, GC-MS, FTIR, and**evaluate the solid phase by thermogravimetric analysis. Our objective is to maximize the polystyrene yield**(solids phase) with less than 1000 ppm Br and identify how to recover/treat the soluble compounds.