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almost 185 times more important than pressure factor for the co-solvent enhancement effect on solubility of various PCB resins in SCF CO2. WRP difference for co-solvent effect at 6 hrs 2 1.5 1 0.5 0 100 150 200 250 300 Temperature (C) y = 0.0148x - 1.9293 2000 psi 4000 psi 6000 psi Linear (Mean) Figure 22 WRP difference by temp change at 6 hrs c) Summary From the two group studies, we can conclude that addition of 7 mole % of water induce small enhancement effect on the PCB dissolutions by solubility of PCB resins in SCF CO2 at the designed pressure, temperature and time conditions, which could be resulted from the fact that 7 mole % of water is much less than needed in the PCB dissolution process and most of the water is released with CO2 during the first rapid depressurization. Short of water in the following experimental process reduces the overall enhancement effect of co-solvent on solubility of PCB resins in SCF CO2, which could be improved by addition of more water in the experiment to ensure certain amount of water works until the end of each experiment. For the H2O co-solvent effect, temperature factor plays a much more important role than pressure factor. Comparison on delaminating effect This part is for examining the delaminating effect enhanced by the 7 mole % of water added as co-solvent. The board selected for comparison is the B1 board which is the biggest among the five specimens. The images are all taken by a microscope at 60 X magnitude. From previous WRP analysis, the PCB dissolution time is sufficient with 3 hours treatment. So the comparison are conducted at three levels according to the pressure and temperature conditions, namely high level at 6000 psi, 250 C with 3 hours treatment; middle level at 4000 psi, 200 C with 3 hours treatment and low level at 2000 psi, 150 C with 3 hours treatment. Before the comparison for examining the delaminating effect caused by pure CO2 treatment and CO2 plus H2O treatment, images from the non-treated B1 boards are presented. Figure 23The cross section of two non-treated B1 boards 24 WRP Difference (%)PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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