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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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3.2. REACTION VESSELS Two types of reaction vessel have been used in the research reported herein. The attributes of each reactor type and ancillary equipment will be discussed, paying particular attention to the differences between the two systems. Low-Temperature Reactor System The Low-Temperature Reactor (LTR), supplied by Parr Instrument Company (Moline, USA), was used to process PEEK samples with scCO2. The LTR has a nominal volume of 25 ml and has minimum and maximum working temperatures of 263.15 K and 473.15 K respectively. The maximum working pressure of the reactor is 34.5 Mpa. The reactor lid was fitted with a busting disc rated to 34.5 MPa. The stainless steel reactor is equipped with two sapphire viewing windows, front and rear. A Camtek DSP Colour Camera is used to observe the inside of the reactor from the front, illumination is provided by VWR VisiLight I-LED portable lights shone through the rear sapphire window. The video image is output to a monitor, no recording facility was available and imaging was used exclusively for qualitative purposes. Heating to the reactor is supplied by a Thermo Electron Corporation HAAKE B3 oil heater with a HAAKE DC 30 controller. The agitator cooling jacket is cooled by a PolyScience Chiller, maintained at 269 K. The reactor’s internal pressure was monitored with an Ashcroft Duralife pressure gauge (accuracy, ± 1 %). The temperature was monitored by means of an RS Components type K thermocouple connected to an RS219-4602 Digitron 3900 display, in addition to the HAAKE DC 30 controller. Liquid CO2 (purity, 99.99 %) was received from a liquid withdrawal CO2 cylinder, supplied by BOC Ltd, to an HIP 62-6-10 manual piston pump. 77

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

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