The invention discloses a technology process for producing
biodiesel and a key preparation device. The technology process mainly comprises the following steps of: carrying out
hydrolysis reaction on
raw material oil and
softened water so as to generate
fatty acid; carrying out
esterification reaction on the
fatty acid separated by a
cyclone hydraulic separator and methyl
alcohol under a certain condition, thereby preparing coarse
fatty acid methyl ester, and separating; and distilling the coarse
fatty acid methyl ester by a distilling
tower, and separating, thereby obtaining
fatty acid methyl ester-
biodiesel. The key preparation device for achieving the technology process is a reaction
tower which mainly comprises a
tower body, a heavy separator, a baffle plate, an overhauling port, a
distributor, a
gas phase methyl
alcohol inlet, a material outlet, a water outlet, a heat conduction oil inlet, a heat conduction oil outlet, a heat conduction oil jacket, a material inlet, a water inlet, a
safety valve, a temperature meter, a pressure meter and a
gas phase methyl
alcohol outlet. The technology process for producing
biodiesel and the key preparation device have the characteristics of no need of catalysts, no environmental
pollution, low reaction pressure and
reaction temperature, less
energy consumption, low investment and running costs, wide
raw material application range, high yield and the like.