owing to more contacting area of methanol to drive forward reaction in the reactivezone. However, reboiler duty was increased too due to additional energy consumed to heat methanol and the nature of endothermic reaction in the reactive section. The optimal conditions for hybridization RDwith 6%FFA were found to be 8 reactive stages (3 for esterification and5 for transesterification), 22% methanol excess and reboiler duty of141 kWhr/kmol of biodiesel
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