“…Trans -esterification is one of the most important and most common methods used in biodiesel production [ 13 ], which is the reaction of triglycerides with alcohol (methanol or ethanol) in the presence of an acidic, basic or enzymatic homogeneous catalyst to produce an alkyl ester (biodiesel) [ 14 ], In this process glycerol emerges as a by-product [ 15 ]. Methanol is the most common type of alcohol used in biodiesel production because of its physical and chemical advantages, besides, its reaction with triglycerides is fast and gives a better and fast conversion rate due to the short chain [ 16 ], and other alcohols can also be used such as ethanol, propanol and butanol [ 17 ].…”