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The aim of this communication is to report the reduction of biodiesel acidity by wet washing using aqueous/methanol NaOH solutions. For this purpose, some assays were carried out, varying temperature, methanol concentration, molar ratio of NaOH to FFA and the amount of NaOH solution, with results expressed in terms of final acidity and process yield. It is shown that 35 °C, 1 wt% of methanol, 1 NaOH:FFA...
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