TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The 1-4C alkanol is methanol or ethanol. The molar ratio of (II) and 1-4C alkanol is 1:8-1:6. The transesterification catalyst is a homogeneous catalyst such as potassium hydroxide (preferred), potassium methoxide, sodium hydroxide or sodium methoxide; or a heterogeneous solid basic catalyst, such as zeolite ETS-10.The biodiesel fuel mixture comprises a mixture of ethyl esters of palmitic acid (12-18%), stearic acid (11-15%), oleic acid (22-27%) and linoleic acid (44-49%), and Balanites aegyptiaca saponins (0.01-0.05%). (I) has the properties given in the table specification e.g. (I) has the: iodine value of 97-100 g I2/100 g; sulfur content of 2-5 mg/kg; lubricity of 124-126 mu; potassium content of 410-450 mg/kg; and sodium content of 2.5-3.3 ppm.Preferred Process: The process is carried out at 25-80degreesC or 25-60degreesC.Preparation of (I) comprises reacting Balanites aegyptiaca oil with ethanol at a molar ratio of 1:8-1:6, at room temperature (25degreesC) or 63degreesC, under intensive mixture conditions, in the presence of potassium hydroxide, and allowing the transesterification to occur while removing the glycerol formed during the reaction; washing the mixture of ethyl esters of fatty acids with water to remove the potassium hydroxide; and recovering (I) comprising a mixture of ethyl esters of fatty acids of palmitic acid (12-18%), stearic acid (11- 15%), oleic acid (22-27%) and linoleic acid (44-49%), and optionally Balanites aegyptiaca saponins. In the preparation of (II), the washing step is performed with circulating water; the extraction in step is performed by extruding the powder using an organic solvent and draining the crude Balanites aegyptiaca oil; the filtration step comprises centrifugation of the crude Balanites aegyptiaca oil followed by a vacuum filtration of the oily phase obtained and decantation of the crude Balanites aegyptiaca oil. EXAMPLE - A mixture of Balanites aegyptiaca oil (233 g), absolute ethanol (99.4 g) and potassium hydroxide (2.3 g) (1 wt.% with respect to the Balanites aegyptiaca oil) was mechanically stirred at room temperature (25degreesC) in a batch reactor for 3 hours, and the two phases obtained were separated. The upper phase was washed with a saturated solution of sodium chloride (50 ml) and then dried over magnesium sulfate, filtered and evaporated to yield Balanites aegyptiaca biodiesel (215.8 g, 97%).