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WRP difference for co-solvent effect at 3 hrs 2 1.5 1 0.5 0 100 150 200 250 300 Temperature (C) y = 0.0033x + 0.0274 2000 psi 4000 psi 6000 psi Linear (Mean) Figure 20 WRP difference by temp change at 3 hrs b) WRP comparison for H2O co-solvent effect with 6 hour treatment The data are calculated by WRP difference between PCBs treated in pure SCF CO2 and PCBs treated in SCF CO2 plus 7 mole % of H2O, at the corresponding pressure and temperature conditions when time is given for 6 hours for the interactions between PCB resins and SCF CO2. The result is shown in figure 21 and figure 22, respectively, based on the three pressure and temperature levels. The lines are representing the trends of WRP difference between the pure SCF CO2 treated PCBs and SCF CO2 plus H2O treated PCBs at the three pressure and temperature levels when time is given for 6 hours. Figure 21 describes the pressure change effect on WRP difference between the PCBs treated in pure SCF CO2 and PCBs treated in SCF CO2 plus 7 mole % of H2O when time is given for 6 hours for the interactions between various PCB resins and SCF CO2. The trend line is regressed with a slope of 8 x 10-5 and an intercept of 0.6837 percent, which also demonstrate a negligible effect of pressure change on WRP differences between the PCB specimen treated in pure SCF CO2 and PCB specimen treated in SCF CO2 plus 7 mole % of water. The result is consistent with that in previous studies when time is set at 3 hours for dissolving PCB resins in SCF CO2. WRP difference for co-solvent effect at 6 hrs 2 1.5 1 0.5 0 y = 0.00008x + 0.6837 0 2000 4000 Pressure (psi) 6000 8000 150 C 200 C 250 C Linear (Mean) Figure 21 WRP difference by pressure change at 6 hrs Figure 22 describes the temperature change effect on WRP difference between the PCBs treated in pure SCF CO2 and PCBs treated in SCF CO2 plus 7 mole % of H2O as co-solvent when time is given for 6 hours for the interactions between various PCB resins and SCF CO2. In the figure, the trend line is regressed with a slope of 1.48 x 10-2 and an intercept of -1.9293 percent, which demonstrate a small increase effect of temperature change on WRP differences between the PCB specimen treated in pure SCF CO2 and PCB specimen treated in SCF CO2 plus 7 mole % of water. The trend line shows that at the 6 hours time level, temperature factor is 23 WRP Difference (%) WRP Difference (%)PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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