Authors: Shaohong Peng Sha Liang Mei Yu Xia Li
Publish Date: 2013/07/25
Volume: 16, Issue: 1, Pages: 178-185
Abstract
A new recycling process for the supercritical CO2 scCO2 extraction of polybrominated diphenyl ethers from waste high impact polystyrene HIPS was developed in this paper HIPS was first dissolved in dlimonene The remaining decabromo diphenyl ether decaBDE particles in solution were then removed by centrifugation and the PBDEs in the centrifugate solution were further extracted by scCO2 The influence of temperature and pressure the volume ratio of scCO2 to plastic solution and the concentration of decaBDE in the solution on the separating efficiency were investigated The decaBDE particles in 20 of the HIPS solution can be removed by centrifugation at a speed of 10000 r/min at 30 °C The suitable scCO2 fluid conditions were 65 °C and 20 MPa and the optimum volume ratio of the scCO2 to the HIPS solution was 21 More than 97 of the PBDEs were successfully removed and the concentration of PBDE residues in the recycled HIPS was reduced to lower than 01 dry by this recycling process
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