oa South African Journal of Chemical Engineering - Statistical experimental design for the optimisation of dilute sulphuric acid hydrolysis of oil palm empty fruit bunch
Dilute acid hydrolysis was applied for the pretreatment of oil palm empty fruit bunch (OPEFB) to produce fermentable sugars. Chemical composition analysis of the OPEFB used in this study revealed that the major components were cellulose, hemicellulose and lignin which accounted for 40.2, 22.1 and 19.2% of the material respectively. The OPEFB was subjected to dilute sulphuric acid hydrolysis and the effect of temperature (100-150 °C), acid concentration (0.5-3.0 %w/w), time (10-40 min) and liquid to solid ratio (30-40 mL/g) on the hydrolysis pr°Cess was quantitatively evaluated using a four variable Box-Behnken design. Response surface methodology (RSM) was used to optimise the hydrolysis pr°Cess in order to obtain maximum fermentable sugar yield. The optimum hydrolysis temperature, acid concentration, time and liquid to solid ratio were obtained as 150 °C, 3 %w/w, 30 minutes and 40 mL/g respectively. Under these conditions, the maximum sugar yield was obtained to be 94.74%.
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