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demonstrates that time increase over 3 hours induce no increase in WRP of PCB dissolutions in SCF CO2 treatment. Time effect on WRP at 2000 psi 20.000 15.000 10.000 5.000 0.000 234567 Time (hr) 150C 200C 250C Figure 9 Time effect on WRP at 2000 psi The WRP increase by time increase at 2000 psi level is calculated for studies of time change effect on WRP by subtracting the averaged WRP data under 3 hours from the WRP data under 6 hours. The results present very small increase of WRP at 150 C and 200 C while a very small decrease at 250 C. The number is so small (all less than 0.3) that they can be treated from experimental errors. Then conclusion can be drawn that the time increase from 3 hours to 6 hours at 2000 psi pressure level induces no change in the WRP result. It states that 3 hours for PCB dissolution in SCF CO2 is long enough for complete interactions between PCB resins and SCF CO2. b). Time effect at 4000 psi The result is shown in Figure 10 blow. The figure also demonstrates a steady WRP trend when time is increased from 3 hours to 6 hours at each temperature level with pressure set at 4000 psi level for each test. Time effect on WRP at 4000 psi 20.000 15.000 10.000 5.000 0.000 234567 Time (hr) 150 C 200 C 250 C Figure 10 Time effect on WRP at 4000 psi Thetimeincreasefrom3hoursto6hoursinducesverysmallincreaseinWRPat150 Cand 200 C temperature levels, while a small decrease in WRP happens at 250 C temperature level, which is consistent with the results in previous section when pressure is set at 2000 psi. Similarly, the small increase can be treated as resulted from experimental errors and hence no WRP changes can be concluded for time increase from 3 hours to 6 hours at 4000 psi pressure level. 15 Weight loss (%) Weight loss (%)PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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