Rapport SGC 198 Bio-Propane from glycerol for biogas addition

Dehydration and hydrogenation of 1-PropanolYield and balance%110 %100 %90 %80 %70 %60 %50 %40 %30 %20 %10 %CarbonbalancePropaneyieldPropeneyieldEthaneyieldMethaneyield0 %0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32Time (h)Figure 9 Conversion of propanol to propane.As the temperature of the dehydration reactor (reactor 1) is decreased the dehydration of propanoldecreases and the yield tales off However, after 22 hours the inlet temperature of reactor1 is returned to 280°C and the propane yield returns to approximately 85%.2.1.6 Glycerol to PropeneIn this experiment the integrated process for production of propene from glycerol is demonstrated.This means that it includes the glycerol to acrolein step, acrolein to propanol step andthe propanol to propene step. In the experimental set-up (figure 3) reactor 1 was loaded with30 g of dehydrogenation catalyst (Z-1152 10-20 mesh), reactor 2 with 12 g of commercialhydrogenation catalyst and reactor 3 with 30 g of dehydrogenation catalyst (Z-1104 10-20mesh). The inlet temperature was 280°C, 270°C and 280°C for reactor 1, 2 and 3 respectively.The feed was 18 g/h of 20 w% glycerol in water and the operation pressure was 5 bar(a).400 ml of hydrogen was added to the inlet stream in the pre-heater. In figure 10, the result of a30 h run is shown.100 %Conversion of glycerol to propene+ propane80 %Yield and balance %60 %40 %20 %CarbonbalancePropeneyieldPropaneyield0 %0 2 4 6 8 10 12 14 16 18 20 22Time (h)Figure 10 Conversion of glycerol to propene with H 2 present.9