Optimization of pyrolysis condition for bioactive compounds of wood vinegar from oil palm empty bunches using response surface methodology (RSM)

摘要

Optimized of the phenol and acid total of wood vinegar from oil palm empty bunches using response surface methodology was carried out.Response surface methodology (RSM) with central composite design (CCD) was employed to optimize the parameters of pyrolysis process,namely pyrolysis temperature (Xi) and pyrolysis times (X2).Two variables,namely pyrolysis temperature (°C) and pyrolysis time (min) with 5 levels (-1.414,-1,0,1 and 1.414) were used to design the optimization model.The two variables,a temperature of 420 °C and a pyrolysis temperature of 122.40 minutes were the optimized conditions for the response variables of phenol total content.Meanwhile,the temperature of 422 °C and the pyrolysis temperature of 118.5 minutes were the optimized conditions for the response variables of the total acid content.The regression equation obtained for phenol and acid total content were Y = 2.97 + 0.12 X,+ 0.03 X2 + 0.23 X_1~2-0.24 X_2~2-0.24 X1.X2,and Y = 9.89 + 0.63 X1 + 0.70 X2-0.56 X_1~2+ 0.12 X_2~2-1.70 X1.X2,respectively.The optimal conditions for the highest yield of phenol and acid total were 3.13 and 10.04 %,respectively.