The invention discloses a device and process for producing
biodiesel through a one-
step method, and relates to the technical field of
biodiesel, the process comprises the following steps: step 1, mixing 100-110 parts by weight of
plant pitch, 10-11 parts by weight of
methanol and 1.9-2.1 parts by weight of a catalyst to obtain a mixed material; step 2, heating the mixed material to 73-77 DEG C, stopping heating, then carrying out a heat preservation reaction, monitoring the
reaction temperature, controlling the temperature to be 75-105 DEG C, carrying out a
reflux reaction for 5.5-6.5 h, removing
methanol, stopping stirring, and standing for 1 h to obtain crude
plant pitch methyl ester; step 3, treating the crude
plant pitch methyl ester by adopting reduced pressure rectification, and
steaming out light yellow
fatty acid methyl ester; 4,
fatty acid methyl ester and the
metal salt treating agent are mixed and then subjected to deacidification treatment, the stirring time of deacidification treatment is controlled to range from 15 min to 20 min, standing is conducted for 1 h, and the
biodiesel is obtained. The method has the effects of increasing the biodiesel yield, shortening the reaction period and reducing the production cost.