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predetermined time period. 3). Pressure drop: The retention time is evenly divided into three slots for rapid depressurizations. At the end of first two slots, a rapid depressurization is conducted to drop the pressure to 1/5 of the original level to induce foaming effect. Then the reactor is pressurized to the target pressure again. This work is repeated for investigation of cyclic depressurization effects on PCBs. 4). Test conclusion: At the end of the process, the pressure is released rapidly and the vessel is cooled to room temperature. The PCBs are carefully removed from the vessel and examined for weight reduction and delaminating effect. Figure 4 Flowchart of SCF experiment procedure After each run of the experiment, data on the weight reduction percent of the five boards are collected for analysis of the resin removal by SCF CO2 treatment. The data is comparable and the analysis result will give out the hidden information in the SCF CO2 treatment of PCB scraps. Experimental Results and Analysis The experiment results are WRP data collected from the SCF CO2 treatment of PCB specimen at various testing conditions. For each run, the five collected WRP data are averaged to study the overall effect of PCB dissolution in SCF CO2 treatment. The averaged WRP data are used to analyze the pressure, temperature and time change effect on PCB dissolution. In this section, the averaged WRP data are set into two groups according to co-solvent added or not. In each group, the averaged WRP data are used for detailed analysis of pressure, temperature and time increase effect on WRP variations. At last, the two groups are compared for examining the co-solvent effect. Pure SCF CO2 Treatment Pressure effect The WRP data are organized to examine the effect of pressure change on PCB dissolution. The pressure is studied at three levels, namely 2000, 4000 and 6000 psi, respectively, at the same temperature and time level. The foaming effects are induced by three times of rapid depressurizations which are evenly distributed in the dissolution processes. The averaged WRP is analyzed in two groups according to the two time levels. 11PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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