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supercritical. This may be observed by presenting the reactor’s internal pressure as a function of temperature as shown in Figure 86. 16 14 12 10 8 6 4 2 0 [PrOH] = 20 %v [PrOH] = 50 %v [PrOH] = 80 %v + 300 350 400 450 500 550 600 Temperature (K) Figure 86: Reactor internal pressure as a function of temperature for varying propanol concentrations [PrOH], [Cs2CO3] = 10 mg ml-1, + = critical pressure It is evident from observations, as presented in Figure 86, that for the reaction temperature used (573 K) the supercritical state was only achieved when the propanol concentration was 80 %v or greater. Attaining the supercritical state results in an increase of the fluids diffusivity, and decomposition of the epoxy resin is substantially increased (Figure 84). The linear increase in both the percentage mass loss and the phenol concentration in supercritical conditions indicate that the decomposition is by solvolysis, not requiring the presence of water. If the process was one of hydrolysis there would be a reduction in the percentage mass loss, and subsequent reduction in the phenol concentration observed, as the propanol concentration tends towards 100 %. Having identified 100 % propanol as the 229 Pressure (MPa)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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