TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The drainage opening is set at the bottom of the groove body of the raw material pre-treatment tank to any angle, where the groove body is obliquely arranged to install the drainage impurity outlet at 2 degrees . The raw material pre-treatment tank body is fixed on one side of the metal pipe port from the bottom groove of 80-100 mm. The reactor comprises a vertical cylindrical metal or a porcelain enamel glass kettle body. The kettle body is a hollow jacket. The jacket is provided with at least one outer wall of the upper part of the heat transfer medium inlet. The outer wall of the lower part is provided with at least one heat transfer medium outlet. The jacket is filled with a heat conducting medium. The crude methanol outlet and the methanol inlet are located in the kettle body. The oil inlet and crude outlet are located on the jacket. The upper part of the outer wall of the kettle body is provided with at least one catalyst inlet. The top of the kettle body is provided with at least one temperature port. The kettle body is provided with at least one water outlet. The kettle body is inserted into a rigid kettle stirring shaft along the vertical axis from the top. The stirring shaft in the kettle is set two parallel spaces at the end of a stirring blade. The outer end of the stirring shaft is connected with a speed reducer and a motor. The stirring paddle is a folding bladed paddle or anchor. The diameter of the catalyst inlet is 80-100 mm. The jacket is filled with a heat-conducting medium, which is steam or heat conducting oil. The methanol recovery tower in the metal plate tray is welded on the side wall of the tower body, where the diameter of the sieve plate tower disc is 6-15 mm. The metal filler is located at the vacuum distillation tower. The metal filler is a metal packing or structured packing. The feed pump D is connected with the interface on the metal filler. The outlet of the qualified biodiesel is located on the metal filler.