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The WRP increase percent demonstrates a very small increase in WRP at 150 C and 200 C, whilea2.408%ofWRPincreaseat250 Castimeisincreasedfrom3hoursto6hoursat4000 psi pressure level when 7 mole % of water is added as co-solvent. The big WRP increase at 250 C temperature level may come from the oxidation effect which degrades more polymeric materials at longer time when pressure is set at 4000 psi level and 7 mole % of water is added as environmentally benign co-solvent to enhance the interactions between PCB resins and SCF CO2. c) Time effect on WRP with 7 mole % H2O added at 6000 psi The result is shown in Figure 18, which demonstrates steady WRP trends when time is increased from 3 hours to 6 hours at the three temperature levels with pressure set at 6000 psi and 7 mole % of water added as co-solvent. Time effect on WRP with H2O at 6000 psi 20.000 15.000 10.000 5.000 0.000 234567 Time (hr) 150C 200C 250C Figure 18 Time effect on WRP with 7 mole % water added at 6000 psi The WRP increase percent is calculated. The data show that the time increase from 3 hours to 6 hours induces very small increase in averaged WRP at the three temperature levels when pressure is operated at 6000 psi level and 7 mole % of water is added in each experiment. The WRP increase number at 150 C and 200 C is so small that we can treat them from experimental errors, while the 0.49% of WRP increase at 250 C level may resulted from oxidization effect. d) Summary By the three group studies of time change effect on the PCB dissolution in SCF CO2 with 7 mole % H2O added as co-solvent at the three pressure levels, the analysis results lead to a conclusion that time increase from 3 hours to 6 hours induces very few changes on the overall weight reduction of PCB materials. PCB dissolution in SCF CO2 is good enough with 3 hours for a complete interaction between various PCB resins and SCF CO2. The result confirms the conclusion for time increase effect on WRP from previous studies in pure CO2 treatment of PCBs. Comparison for H2O Co-solvent Effect The comparison for studies of H2O co-solvent effect is performed in three parts: WRP differences by calculations, delaminating and surface cracking by image analysis. 21 Weight loss (%)PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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