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Effects of Reaction Time The schedule for the investigation into the effects of the reaction time is given in Chapter 3.3.2. In summary, the reaction time was varied from 0 minutes, consisting of heating and cooling only, to 120 minutes. The concentration of phenol produced, measured by HPLC as described in detailed in Chapter 3.4.3, is presented in Figure 65. 5 4 3 2 1 0 0 20 40 60 80 100 120 Reaction Time (min) Figure 65: Phenol concentration [PhOH] with respect to reaction time, 623 K, [PrOH] = 20 %v, [H2O] = 80 %v, 16.4 ± 0.2 MPa, 10mg ml-1 Cs2CO3, 10 mg ml-1 PEEK. Determined by HPLC Figure 65 shows that the water / propanol system responds in a similar way to the water / ethanol system when the concentration of alcohol [R-OH] is 20 %v. Rapid progression of the decomposition reaction takes place within the first 30 minutes, leading to a phenol concentration of 65 % of the maximum observed. Doubling the reaction time from 30 to 60 minutes leads to an increase of 25 % in the phenol concentration. Subsequent doubling of 204 [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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