It is necessary to determine the acid value of raw materials in the preparation of biodiesel
Acid catalyzed transesterification is suitable for the preparation of biodiesel with high content of fatty acid and water (mainly waste), which has high yield, slow reaction rate, high acid consumption, difficult separation, and easy corrosion of equipment. The method can obtain high yield at low temperature, and the reaction rate is fast, but it has a higher requirement on the content of free fatty acid and water in the raw material.
Because the preparation of biodiesel, the use of alkali catalysis, the acid value requirementsHigh acid value corrosion of diesel engine, it can not of course as methyl ester biodiesel is one of the most important indicators of acid value.
Oil in acid or alkali catalyzed condition with methanol transesterification reaction, to lower crude glycerol, the added value of crude glycerine recovered with high; upper after washing and drying to obtain biodiesel. There are four main factors affecting the reaction: alcohol oil ratio, catalyst dosage, reaction time and the reaction temperature, one of the most important factors is alcohol oil ratio and catalyst dosage.
