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The system is mainly composed of four modules: 1) The reaction module: the main component in this module is the high pressure vessel that is used to contain the supercritical fluids to study their interactions with PCBs. 2) The control module: a two stage double acting gas booster is used to pressurize the system. A lab oven is used to heat the vessel and maintain the vessel at a constant temperature. Needle valves and check valves are used to maintain a constant pressure. A safety valve is used to keep pressure of the system in a safe region. 3) The monitor module: a pressure transducer with digital readout, a temperature meter with thermocouple, and several pressure gauges are used to monitor the system parameters. 4) The supply module: it consists of a CO2 supply cylinder, pressure air supply source to drive the gas booster and taper seal tubing that works as channels for CO2 and air, connecting all functional components in the system. The reaction module This is a high pressure vessel in which PCB scraps are exposed to the supercritical fluids. The vessel is a confined gasket closure reactor manufactured by High Pressure Equipment Company located in Erie, Pennsylvania. The vessel was acquired with considerations on its inner size which can hold relatively big-sized PCB scraps up to 10 inches long and 3 1⁄2 inches wide, while the pressure vessel used in exploratory studies is in 1 inch wide and 10 inches long. Detailed specifications of the vessel are described in the table 1 below: Table 1. Specifications of the pressure vessel Model # GC-21 I.D. 3 1⁄2 “ O.D Inside Depth 6 7/8 “ 10” Volume 1,575 ml Material 316 S.S Weight 213 lbs Working Pressure (psi) 100 F 650 F 800 F 10,500 9,000 8,000 The control module: The control module is the functional parts which work together to control parameters in the reaction processes. The major parts are a gas booster and laboratory oven which apply high pressure and high temperature, respectively, to the system. The gas booster is a two-stage double acting pump which is manufactured by Haskel. Its specifications are shown in table 2: Table 2 Specifications of the gas booster Max. rated gas Max. out let gas Max. air drive Max. Model # inlet (psi) pressure (psi) pressure (psi) compression ratio AGT 62/152 9,000 20,000 150 60:1 The oven used is a Thelco Lab oven manufactured by Precision Scientific Inc. located in Winchester, Virginia. In order to support the heavy pressure vessel, the oven was modified by removing its shelves and installing a cast iron plate with a 1.5” diameter steel foot welded in the middle which extends down to the ground through a bottom hole in the oven base. The oven is designedtoreach250 Cwithin60min.However,afterthemodification,theovenneeds7hours to heat the big vessel to 250 C. Specifications of the oven are shown in table 3 below: 7PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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