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By analysis of Figure 61 it can be seen that the concentration profile of phenol produced as a consequence of the decomposition of PEEK is similar to the profile identified when ethanol is used as a co-solvent, with the exception of when the propanol concentration is 50 %v. The critical point of a 50 : 50 water / propanol mixture is 584 K and 10.23 MPa [314], whereas the critical point for a 20 : 80 water / propanol mixture, calculated by interpolation, is 620 K and 16.75 MPa. The reactor’s internal pressure was measured as a function temperature for all reactions and is provided in Figure 62 for the two conditions in question. 25 20 15 10 5 0 + [PrOH] = 20 %v [PrOH] = 50 %v 300 350 400 450 Temperature (K) 600 650 500 550 Figure 62: Pressure as a function of temperature for propanol and water co-solvent system, T = 623 K, [Cs2CO3] = 10 mg ml- 1, tr = 30 min, solvent loading = 50 %v, + = critical point From Figure 62 it is evident that when the propanol concentration is 20 %v the reaction is subcritical. The reaction temperature was 623 K, 3 K above the critical temperature, but the reaction pressure was 16.35 MPa, 0.4 MPa below the critical pressure of the mixture. 200 Pressure (MPa)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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