TECHNOLOGY FOCUS - METALLURGY - Preferred Components: The catalyst is a solid heterogeneous catalyst. The catalyst is a metal oxide doped with an alkali metal chosen from lithium, sodium and potassium. The metal oxide is an oxide of alkaline earth metals, group IIIA metals, transition metals, post-transition metals and/or lanthanides. Preferably, the metal oxide is an oxide of magnesium, calcium, or aluminum, more preferably, the metal oxide is magnesium oxide and calcium oxide. The alkali metal doped-metal oxide is lithium-calcium oxide, sodium-calcium oxide, potassium-calcium oxide or calcined lithium-magnesium oxide, preferably, calcined lithium-magnesium oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Properties: The monoalkyl ester(s) of long chain fatty acid(s) comprises major proportion of the unrefined extract. The conversion to the monoalkyl ester(s) of long chain fatty acid(s) is 80 weight% or more of the total amount of acylglycerols, preferably in excess of 90 weight%, particularly preferably in excess of 95 weight%, more, particularly preferably in excess of 98 weight%, most preferably in excess of 99 weight%. The conversion to the monoalkyl ester(s) of long chain fatty acid(s) is 80% or more of the total amount of triglycerides, preferably in excess of 90%, particularly preferably in excess of 95%, more particularly preferably in excess of 98%, most preferably in excess of 99.5%. The ratio of transesterifying alcohol with respect to organic solvent added to vegetable oil or animal fat is 10:90-90:10, particularly preferably 30:70-70:30, especially preferably 40:60-60:40, more especially preferably 45:55-55:45. The catalyst has a base strength of 8 or more, preferably 10 or more, more preferably 11-15. Preferred Components: The unrefined extract constitutes biodiesel. The unrefined extract comprises monoalkyl ester(s) of 11-24C fatty acid(s). The monoalkyl ester of fatty acid is of formula: R1O(OCR). The vegetable oil or animal fat comprises acylglycerol(s). The predominant acylglycerol is triglyceride(s). The triglyceride is of formula: RCOO-CH2CH(-OOCR')CH2-OOCR". The transesterifying alcohol is an optionally substituted 1-6C alcohol, preferably 1-3C alcohol, more preferably, methanol or ethanol, most preferably, methanol. The organic solvent is an alcohol solvent, preferably, optionally substituted 1-6C alcohol, more preferably propanol or ethanol, most preferably, ethanol. The organic solvent is a non-polar solvent, and 1-12C alkane, preferably 1-6C alkane, more preferably, hexane. The vegetable oil is rapeseed oil, soy or Jatropha. The vegetable oil is rapeseed oil. The source of vegetable oil is oilseed.R,R',R"=long chain alkyl;andR1=optionally substituted 1-6C alkyl, preferably, methyl or ethyl, more preferably, methyl.Preferred Process: The unrefined extract of vegetable oil or animal fat is prepared by adding transesterifying alcohol and organic solvent to the source of vegetable oil or animal fat, together with one portion of catalyst to produce an intermediate unrefined extract, and adding another portion of the catalyst to the intermediate unrefined extract.