Biodiesel: The influence of dealcoholization on reaction mixture composition after neutralization of catalyst by carbon dioxide

► Transesterification of rapeseed oil under homogeneous catalyst - potassium hydroxide. ► The reaction mixture was neutralized by excess of gas carbon dioxide. ► Potassium hydrogencarbonate and carbonate (transesterification catalyst) are formed from KOH. ► Acid number of biodiesel is always less than 0.2 mg KOH/g. ► The correlation between methanol concentration in the EP and its flash point.