TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The heterogeneous catalyst is at least one of an alkaline catalyst and acid catalyst (preferably at least one of a hydroxide of Group 1 or 2 metals, silicate of Group 1 or 2 metals, carbonate of Group 1 or 2 metals, strong anion exchange resin in the hydroxide form, and/or oxide of aluminum and magnesium, especially at least one of a zeolite in the acid form, strong cation exchange resin in the hydrogen form, and/or Lewis acid).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The mixing occurs at the same time as flowing. The mixing involves: combining the triglyceride and the alcohol in a ratio of at least 10 wt.%. The method further involves: maintaining a pressure at or greater than autogeneous pressure; applying radio frequency (RF) or microwave energy to at least one of the triglyceride, the alcohol and/or the heterogeneous catalyst. The method takes place at a pressure of 10-100 psig above the autogeneous pressure. The applying RF or microwave energy involves: controlling at least one of a frequency, power density and/or field strength; or modulating the energy. In the method, an average power density is maintained at 0.01-100 (preferably 0.05-10, especially 0.1-3) watts/cc. The modulating involves: at least one of amplitude modulation, frequency modulation and/or pulse width modulation. Preferred Components: The triglycerides are present in at least one of plant oil and/or animal oil; in an oil derived from at least one of soybeans, corn, sunflower, palm, nut, safflower, olives, cotton, linseed, mustard seed, rapeseed, canola, peanuts, coconut, castor beans, tall oil, soapstock, raw or rendered animal fats, brown grease, white grease, yellow grease, lard or tallow from pork, chicken, mutton, beef and/or horse, as well as wastes, effluents and/or residues from the processing of such materials. The alcohol is 1-6C alcohol (preferably at least one of methanol and ethanol). The relative velocity between the reactant mixture and the heterogeneous catalyst is at least 0.01 (preferably at least 0.05) m/s. The RF or microwave energy comprises a frequency of 1 MHz to 100 GHz (preferably 100 MHz to 10 GHz, especially 400 MHz to 5 GHz). EXAMPLE - No suitable example given.