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3.5 3.0 2.5 2.0 1.5 1.0 0 20 40 60 80 100 120 [PrOH] (%v) Figure 85: Phenol concentration [PhOH] with respect to propanol concentration [PrOH], T = 573 K, t = 30 min, [Cs2CO3] = 10 mg ml-1, [Resin] = 33 3 mg ± ml-1, R2 = 0.970 By inspection of Figure 84 and Figure 85 it may be seen that the decomposition of the epoxy resin relies heavily on the presence of the supercritical state, indicating that the process is diffusion limited. The percentage mass loss deviates slightly from the control sample observations when the propanol concentration is lower than 50 %v. The system, however, does differ from the ethanol water system in that when the co-solvent concentration (in this case propanol) is lower than 50 %v, the decomposition reaction is, in essence, inhibited. This can be seen by inspection of Figure 85 where there is a significant reduction in phenol concentration with increasing propanol concentration. The phenol concentration minima is located at [PrOH] = 50 %v and also corresponds to the minimal percentage mass loss, Figure 84. Increasing the propanol concentration beyond 50 %v leads to the fluid’s critical temperature being below the reaction temperature, and therefore the reaction mixture is 228 [PhOH] (mg ml-1)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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