TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The contacting step reduces an amount of phosphorus within the degummed triglycerides to 2-10 ppm.The reacting step reduces an amount of free fatty acids within the adsorbent-treated triglyceride product to 0.04-0.20 wt.%, based on total weight of adsorbent-treated triglyceride product.An average amount of adsorbent-treated triglyceride product is reacted with the stripping medium for less than 60 (preferably less than 10) minutes within a column.The adsorbent-treated triglyceride product is introduced into first end and exits at second end of column, and the stripping medium is introduced into the second end and exits the first end.The biodiesel fuel precursor is reacted with alcohol(s) to form alkyl ester and glycerin.Glycerin is removed from alkyl ester to form a biodiesel fuel. EXAMPLE - Oil (100 g) was weighed into a flask which was immersed to 1/3 of its height in a silicone oil bath held at 90-100degreesC. After the oil in the flask reached 70degreesC, Trisyl silica (RTM: silica gel) was added and mixed for 15 minutes while maintaining the temperature at 70degreesC. The flask was fully immersed in the silicone oil bath and the contents were heated to 95degreesC under vacuum using a water pump. After the temperature reached 90-95degreesC, the contents were stirred for further 10 minutes at maximum mixing speed while maintaining the temperature. The flask was removed from the oil bath and the contents were allowed to cool to 80degreesC. The vacuum was stopped and the silica gel was filtered from the oil. The resulting sample was measured for phosphorus (P) and trace elements (e.g. calcium (Ca), magnesium (Mg) and iron (Fe)). The starting acid degummed rapeseed oil contained (in ppm) P (23.7), Mg (5.9), Fe (0.67) and Ca (22.4). The silica treated oil contained (in ppm) P (2.4), Mg (0.7), Fe (0.05) and Ca (2.5). A flask was filled with the above treated triglyceride (100 g). Water (2- 4 wt, based on weight of oil) was added to a steam reservoir flask. Nitrogen was passed through a bleed pipe to cause good stirring of oil. The oil was heated to 220degreesC under constant nitrogen blanket. When the temperature of oil reached 250degreesC, nitrogen flow was discontinued and the sample was stripped under 3 mmHg for 5 minutes. The oil sample was cooled to 120degreesC. The nitrogen flow was resumed and the vacuum pump switched off. Water bath was placed under the oil sample and allowed to cool to room temperature. The oil sample was transferred under nitrogen to a screw cap bottle and kept in the dark in a refrigerator. The oil sample had free fatty acid content of 0.14 wt.%, while the acid degummed oil and silica treated oil had free fatty acid content of 0.72 wt.% and 0.65 wt.%, respectively.