Persistent organic pollutants such as brominated flame retardants represent a major problem in the end-of-life of polymer materials. This study investigates the extraction of brominated flame retardants (BFR) from real waste electrical and electronic equipment (WEEE) using supercritical carbon dioxide (sc-CO₂). Sc-CO₂ is a non-toxic solvent which possesses intermediate properties between liquids and gases which confer it high diffusivity and solubility. A batch of WEEE-derived acrylonitrile–butadienestyrene (ABS) was first characterized to determine its bromine and BFR composition which was found to be four times higher than the regulation limit set in 2019. Then, different parameters of the sc-CO₂ process such as temperature, pressure, granulometry and the use of a co-solvent were studied to estimate the effect of each one on the BFR extraction efficiency. With the view to determine the recyclability of the treated polymer, the impact of the extraction process on the polymer material was also studied by Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC) and Size Exclusion Chromatography (SEC). The extraction process performed on <500 µm particle size sample at 40 °C and 500 bars during 6 h and using ethanol as a co-solvent allowed to remove 43.5 ± 0.9% of bromine, which was the maximum extraction rate obtained. Sc-CO₂ extraction was found to be an efficient technique to remove tetrabromobisphenol A (TBBPA) but the tested conditions did not allow to remove enough polybromodiphenylethers (PBDE) to satisfy the regulation. Sc-CO₂ process seems to be a promising pre-treatment method prior to mechanical recycling as no degradation effect on the polymer matrix was observed.

溴化阻燃剂等持久性有机污染物是聚合物材料寿命终结的主要问题。本研究调查了使用超临界二氧化碳 ( sc -CO ₂ )从实际废弃电子电气设备 (WEEE) 中提取溴化阻燃剂 (BFR )。Sc -CO ₂是一种无毒溶剂，它具有介于液体和气体之间的中间性质，使其具有高扩散性和溶解性。首先对一批 WEEE 衍生的丙烯腈-丁二烯苯乙烯 (ABS) 进行表征，以确定其溴和 BFR 的组成，发现其比 2019 年设定的法规限制高四倍。 然后，sc- CO 的不同参数_研究了温度、压力、粒度测定和助溶剂的使用等_{2 个}过程，以估计每个过程对 BFR 提取效率的影响。为了确定处理过的聚合物的可回收性，还通过热重分析 (TGA)、差示扫描量热法 (DSC) 和尺寸排阻色谱法 (SEC) 研究了提取过程对聚合物材料的影响。在 40 °C 和 500 bar 条件下对 <500 µm 粒径样品进行提取过程 6 小时，并使用乙醇作为共溶剂，可以去除 43.5 ± 0.9% 的溴，这是获得的最大提取率。Sc- CO ₂发现萃取是去除四溴双酚 A (TBBPA) 的有效技术，但测试条件不允许去除足够多的多溴二苯醚 (PBDE) 以满足法规要求。Sc- CO ₂工艺似乎是一种有前途的机械回收之前的预处理方法，因为没有观察到对聚合物基质的降解作用。