Separation of WPCBs by dissolution of brominated epoxy resins using DMSO and NMP: A comparative study

Emissions of brominated compounds and polycyclic aromatic hydrocarbons during pyrolysis of E-waste debrominated in subcritical water

“…Xing and Zhang (2013) studied the degradation of PCBs in supercritical water achieving a maximum removal of 97.8% of the bromine with a S/L ratio equal to 1:4 g mL -1 at 400 o C for 120 min. Wath et al (2015) used two organic solvents (N-methyl-2-pyrrolidone (NMP) and dimethyl sulfoxide (DMSO)) as supercritical fluids for degradation of waste PCBs, obtaining better results for the debromination with NMP. Additionally, Wang and Zhang (2012) showed the excellent efficiencies obtained using different supercritical fluids (water (97.6%) > methanol (69.2%) > isopropanol (63.6%) > acetone (46.8%)) for the debromination of computer housing plastic at 400 o C for 60 minutes.…”

Comparative study of printed circuit board recycling by cracking of internal layers using organic solvents-dimethylformamide and dimethylacetamide

“…Liberation of metals by solvent eliminates the need of down-sizing of WPCBs to fine size and metal-nonmetal separation and thus, it offers more economical processing, relatively. Previous studies also expressed that solvent DMF is better than other reported solvents viz.-dimethylsulfoxide (Zhu et al, 2013) and N, N-dimethyl pyrrolidone (Wath et al, 2015). DMF offers lower energy consumption, better mass transfer, and lower evaporation rates, comparatively.…”

Characterization of waste printed circuit boards recycled using a dissolution approach and ultrasonic treatment at low temperatures

“…This was the main reason to use ultrasonication process in the present study. 29 According to acquired results, the separation of WPCBs using solvent has three main steps: penetration of DMF inside the layers, dissolution of BER between the layers, and delamination of the layers themselves. Contact areas between DMF and WPCB layers can be considered as starting points of the separation process, and their increase leads to acceleration of the separation.…”