Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials

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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials ( supercritical-fluids-and-their-application-recycling-high-pe )

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High-Temperature Reaction System The High-Temperature Reactor (HTR), supplied by Parr Instruments Company (Moline, USA), comprises of a 100 ml (nominal volume) cylindrical vessel and lid assembly. Two such reactors were used, one constructed from stainless steel and one constructed from Hastelloy. With the exception of the material of construction both vessels were identical, with the Hastelloy vessel replacing the stainless steel vessel, and therefore will be described together. The vessels have minimum and maximum operating temperatures of 263 K and 773 K respectively and a maximum working pressure of 34.5 MPa. The vessel lid was fitted with a busting disc rated to 34.5 MPa. Where gasses were used, charging and discharging of the reactor was controlled through the use of Swagelok SS-3HNRF4-G valves (Swagelok, USA). Where liquids were used as the sole working fluid, charging of the reactor was carried out prior to final assembly of the system. Swagelok valves provided a discharge capability at the end, and if necessary during, the reaction. In all cases solid samples were loaded into the reactor prior to assembly. Heating and control of the reactor temperature was supplied by a Parr Instruments Company 4848 Reactor Controller and Furnace, with a single type J thermocouple providing feedback to the controller. The reactor’s internal pressure was measured by a pressure transducer with digital readout (Druck, UK) and an analogue pressure gauge (SPAN, USA) attached to the vessel lid. Cooling to the reactor’s magnetic drive agitation system was provided by a peristaltic Watson-Marlow 302 pump (Watson- Marlow Pumps Group, UK) supplying coolant from a Polyscience Chiller (Polyscience, USA) maintained between 268 K and 273 K. The HTR’s, both stainless-steel and Hastelloy, are shown in Figure 5 and Figure 6. 80

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