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4 3 2 1 0 EtOH PrOH DMK 0 20 40 60 80 100 [co-colvent] (%v) Figure 70: Comparative study of phenol concentration [PhOH] as a function of co-solvent concentration [co-solvent], T = 623 K, tr = 30 min, solvent loading = 50 %v, [Cs2CO3] = 10 mg ml-1, [PEEK] = 10 mg ml-1, ethanol (EtOH), propanol (PrOH) and acetone (DMK) It is exemplified in Figure 70 that the performance of the three co-solvents used, ethanol, propanol and acetone, is very similar with respect to the production of phenol when the co- solvent concentration is 20 %v. Both propanol and acetone outperform ethanol as co- solvents when the concentration is 10 %v, despite Cs2CO3 having a greater solubility in ethanol. The maximum phenol concentration was achieved by using a 50 : 50 water : propanol mixture, conditions under which it was not possible to recover any liquid fraction when acetone was used as a co-solvent. The increase in performance of propanol at 50 %v is thought to be a result of attaining the supercritical state and the carbon chain length. Under the same conditions, ethanol was also in the supercritical state and produced a phenol concentration of 1.5 mg ml-1 in comparison to 3.7 mg ml-1 when propanol was used. Similar 211 [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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