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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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continue this area of research. Given that carbon fibres comprise, almost exclusively, of carbon it is thought that the conditions that degrade the graphite seal are likely to have a negative impact on the carbon fibre’s physical properties. Therefore, such conditions were thought to be of little interest within the context of this research as they are unlikely to be employed industrially. The initial results are presented in Figure 68. 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 5 10 15 20 25 [DMK] (%v) Figure 68: Phenol concentration [PhOH] as a function of acetone concentration [DMK], tr = 30 min, T = 623 K, [Cs2CO3] = 10 mg ml-1, P = 15.7 - 16.2 MPa. Determined by HPLC The initial results shown in Figure 68 are similar to the observations made when propanol is used as a co-solvent. It appears that the concentration of phenol, which is used as a method of following the reaction, is likely to decrease with increasing acetone concentration. However, it is important to consider the state of the fluid within the reactor at each point. Figure 69 shows the pressure as a function of the reaction temperature for [DMK] = 10 – 50 %v. 208 [PhOH] (mg ml-1)

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