TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inert cooling gas is at 20-100 degrees C, preferably 20-40 degrees C. The atomization gas is carbon monoxide and/or dioxide, methane, ethane, water vapor, nitrogen, oxygen, nitrous oxides, hydrogen, ethylene, or a noble gas, preferably nitrogen or argon. The solid catalyst is basic, preferably magnesium oxide and calcium oxide, (unsupported or supported over alumina), zeolite, fluidized catalytic cracking catalyst, a hydrotalcite of cobalt, magnesium, aluminum and/or other metals, a mixed metallic oxide of manganese, vanadium, nickel, tungsten, zirconium, silicon and/or alumina, functionalized or unfunctionalized perovskite, or a silica alumate, preferably magnesium oxide/alumina, calcium oxide/alumina, magnesium-aluminum hydrotalcite, or fluid catalytic cracking catalyst. The pressure in the reactor is 10-0.1 bar, preferably 0.8-2 bar. The inert cooling gas is carbon monoxide and/or dioxide, methane, ethane, air, water vapor, nitrogen, or noble gas, preferably air, nitrogen or argon. The fluidization gas is carbon monoxide and/or dioxide, nitrogen, argon, water vapor or a mixture of oxygen and nitrogen, preferably nitrogen or argon. The atomization gas is carbon monoxide and/or dioxide, methane, ethane, water vapor, nitrogen, or a noble gas, preferably nitrogen or argon.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The system further comprises an inert cooling gas inlet located between fluidized bed and below product gas outlet, at least one pump to feed the atomizer nozzle with the alcohol and/or the ether and the feedstock, a furnace to heat the fluidized bed reactor and a quench connected to the product gas outlet to collect the transesterified reaction product.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The process further comprises injecting an inert cooling gas (32) in an upper part of the reactor, collecting the reaction product, isolating the fatty acid alkyl ester from the reaction product and regenerating the catalyst. The gaseous alcohol, gaseous ether and/or gaseous feedstock are provided by atomization of the alcohol, ether and/or feedstock, preferably by atomization of a liquid mixture of the feedstock with the alcohol and/or the ether. The atomization is carried out using an atomizer nozzle and an inert atomization gas. The alcohol, ether and/or feedstock or liquid mixture is heated before atomization. Preferred Components: The alcohol, ether and/or feedstock or liquid mixture is at 25-500 degrees C, preferably 40-70 degrees C before atomization. The reactor is at a temperature higher than 200 degrees C, preferably 400-500 degrees C. The alcohol is a 1-6C aliphatic linear or branched alcohol optionally substituted by an aryl or heteroaryl, preferably at least one of methanol (preferred), ethanol, propanol, butanol, hexanol, heptanol, octanol, nonanol, decanol, benzyl alcohol, iso-butyl alcohol, n-butyl alcohol, 2-ethyl hexanol, furfuryl alcohol, iso-propyl alcohol or n-propyl alcohol. The ether is 1-6C aliphatic linear, branched or cyclic ether optionally substituted by aryl or heteroaryl, preferably at least one of dimethyl ether or tetrahydrofuran. The feedstock comprises at least one of plant gum, plant oil or animal fat. The plant gum comprises at least one of artichoke oil gum, canola oil gum, castor oil gum, Chinese tallow tree oil gum, coconut oil gum, corn oil gum, cottonseed oil gum, flaxseed oil gum, hemp oil gum, Jatropha oil gum, jojoba oil gum, karanj oil gum, kukui nut oil gum, milk bush oil gum, pencil bush oil gum, mustard oil gum, neem oil gum, olive oil gum, palm oil gum, peanut oil gum, radish oil gum, rapeseed oil gum, rice bran oil gum, safflower oil gum, sesame oil gum, soybean oil gum, sunflower oil gum, and tung oil gum. The plant oil comprises at least one of artichoke oil, canola oil, castor oil, Chinese tallow tree oil, coconut oil, corn oil, cottonseed oil, flaxseed oil, hemp oil, Jatropha oil, jojoba oil, karanj oil, kukui nut oil, milk bush oil, pencil bush oil, mustard oil, neem oil, olive oil, palm oil, peanut oil, radish oil, rapeseed oil, rice bran oil, safflower oil, sesame oil, soybean oil, sunflower oil and tung oil. The animal fat comprises at least one of tallow, choice white grease (lard), and poultry fat. The transesterifiable lipids are mono-, di-, and triglycerides, free fatty acids, or phospholipids, preferably triglycerides. The alcohol, ether and feedstock are provided with feedstock and alcohol/ether molar ratio of 1:230-1:2.3, preferably 1:115-1:4.6. The feedstock is provided at a catalyst to oil feed rate ratio (g:ml/minute) of 50:1-1:10, preferably 10:1-1:1. The reaction product further comprises glycerol, unreacted alcohol and/or unreacted ether or a hydrocarbon, an aldehyde, and/or an alcohol. The fatty acid alkyl ester comprises a fatty acid methyl ester and/or a fatty acid ethyl ester. EXAMPLE - No suitable example given.