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solubility in supercritical fluids, the Peng-Robinson EOS [12] is the most widely used one for correlating the solubility of compounds in supercritical fluids [13-17]. Based on the Peng- Robinson EOS, the fugacity coefficient of resin i is written as: ln F bi (Pvi 1) ln P(vi b) a a1i bi ln vi (1 2)b (2) i bRT RT 22RTbabvi(12)b Where vi is molar volume of resin i , ai is a parameter for attractive interactions between resin i and supercritical fluid CO2, bi is a parameter for exclusive interactions between resin i and supercritical fluid CO2. a1i is cross coefficient describing the interactions between resin i and supercritical fluid CO2. a and b are system parameters given by van der Waals mixing rules. They can be determined through the following equations. ai 0.45724 0.07780 RTci P R2T2 ci P ci (3) (4) (5) (6) aiaj(1 kij) (7) bi ci NN a yi yjaij i1j1 aij N b yibi i1 Where P and T are the critical pressure and temperature of resin i . k is a binary ci ci ij interaction parameter and its value is adjusted between 0 and 1 to make the Peng-Robinson EOS fit the experimental data [18]. Experiment Equipment Description The system is specially designed for SCF treatment of PCBs by referring to the established SCF CO2 system in the Chemical Engineering department at Texas Tech University. The system is designed capable of applying 10,000 psi and 250 C to PCB specimen and is controllable for specific time studies, as shown below. Pressure gauge Back Pressure Regulator Pressure Gauge Safety Valve (Rupture Disc) Taper Seal Tee Regulator Pressure Gauge Pressure Pump & compressor Check Valve Temperature Meter Vent Safety Valve (Rupture Disc) Vent Control valve (Needle Valve) Thermocouple Oven Pressure transducer & digital readout CO2 Air On/off Valve Pressure Vessel Taper Seal Tee Figure 2. Schematic diagram of the supercritical CO2 system 6PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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