Rice bran pretreatment: The raw rice bran may contain a small amount of impurities, which are removed by screening; then enter the quenching and tempering system, and a small amount of steam (about 2% of the raw material amount) is introduced into the raw material to soften it, which is convenient for subsequent pressing and oil extraction. Pressing: After pretreatment, the rice bran directly enters the hydraulic press, and adopts the cold pressing method to squeeze most of the eucalyptus oil in the rice bran. The oil is the rice bran oil, which directly enters the physical refining workshop for refining and purification; the cake produced by pressing contains Part of the oil, enter the leaching workshop to further extract the oil. Leaching: the cake enters the oil leaching device, and the solvent n-hexane is added thereto to dissolve the fat in the cake in the solvent to form a mixed oil, and the mixed oil passes through the filter medium (screen), and the solid waste contained therein is trapped. , get a cleaner mix of oil. Mixed oil evaporation: the oil is almost non-volatile, and the solvent has a low boiling point and is easy to volatilize. The coil steam is used to vaporize most of the solvent, so that the concentration of the oil in the mixed oil is greatly increased. The mixed oil phase enters the first long tube evaporator tube from the mixed oil tank, and the evaporated solvent enters a distillation condenser through the separation chamber; the concentrated mixed oil enters the second long tube evaporator for evaporation, and the evaporated solvent vapor is separated. The chamber enters a two-steam condenser. The solvent vapor from the first and second evaporators flows directly into the circulating solvent tank after being cooled by the cold exchanger because it does not contain water. The process mainly uses a long tube evaporator, which is characterized in that the heating pipe is long, and the mixed oil enters the heating pipe from the lower part after being preheated, and rapidly boils, generating a large amount of steam bubbles and rising rapidly. The mixed oil is also carried by the rising vapor bubble and pulled as a layer of liquid film rising along the tube wall, and the solvent continues to evaporate during this process. Since heat transfer is performed in a thin film state, evaporation efficiency is high. Stripping: By evaporation, the concentration of the mixed oil is greatly increased, but it still contains a small amount of solvent oil, which is removed by stripping. The mixed oil is incompatible with water, and a direct steam of a certain pressure is introduced into the concentrated oil with a high boiling point (the direct steam is about 2% of the amount of the material), and the indirect steam is introduced into the jacket of the equipment. Heating, so that the direct steam entering the mixed oil does not condense, the sum of the direct steam and the solvent vapor pressure is balanced with the external pressure, the solvent is boiled, thereby lowering the boiling point of the high boiling point solvent, and the uncondensed direct steam entrains the distilled solvent together. Enter the condenser for condensation recovery. After the stripping, the obtained oil enters the physical refining workshop for refining. Wet mash desolvation: The wet mash separated by the leaching device contains a small amount of solvent, and water vapor is introduced therein to be desolvated to remove the solvent therein, and the principle is the same as that of the mixed oil stripping. The stripping tower and the demixed mixed vapor contain a small amount of water, enter the condenser, and the condensed solvent and water mixture flow into the water separator to separate the water, and the separated solvent flows into the circulating solvent tank. Precipitation filtration: The oil contains insoluble impurity particles, mainly cake slag, sediment, grass clippings, etc., which are separated from each other by natural sedimentation. Hydration degumming: a small amount of water is added to the oil (the amount of water added is about 1% to 3% by weight of the oil), and the water-soluble impurities therein are coagulated and precipitated to be separated from the fat. When hydration, the water-soluble impurities of the coagulation and precipitation are mainly phospholipids. When the oil contains no moisture or the water content is very small, it can be dissolved and dispersed in the oil; when the phospholipid absorbs moisture, the hydrophilic group of water and phospholipid After binding, it has stronger hydrophilicity and more enhanced water absorption capacity. As the water absorption increases, the phospholipid dots gradually expand in volume and condense into colloidal particles to form a colloid, which has a much larger specific gravity than grease. Precipitated from the oil. Vacuum drying: The hydration degumming oil can contain a small amount of water, and is dehydrated by a continuous packing dehydrator. The drying vacuum is about -0.09Mpa, which facilitates the decolorization of the subsequent process. Adsorption decolorization: the oil is transferred into the decolorization tank through the storage tank, and the adsorbent (white soil) sucked by the adsorbent tank is fully contacted under stirring to complete the adsorption equilibrium, and then the oil is pumped into the filter press to separate the adsorbent by cooling, and filtered. The decolorized oil is transferred to the storage tank. The adsorption decolorization time is about 30 minutes, and the amount of clay added is about 2% of the oil weight. Deacidification: the decolorized oil is passed through an oil-oil heat exchanger, and finally heated to about 250 ° C by a heater to enter a deacidification tower. The deacidification tower is a structured packed tower, and the oil flows downward from the top under the action of gravity on the surface of the filler. It is in contact with the saturated steam injected from the bottom to achieve the purpose of stripping and deacidification. The oil flows in the tower for about 5 minutes, and the direct steam is 2% of the oil weight. Deodorization: The deodorization tower is a structural packed tower, and the oil flows downward from the top under the action of gravity on the surface of the filler, and is fully contacted with the saturated steam injected from the bottom to achieve the purpose of stripping and deodorization. The oil flows in the column for about 15 minutes, the deodorization temperature is about 230 ° C, and the direct steam is 1% of the oil weight. The deacidified and deodorized extracted fatty acid is collected by the structural packing trap and then flows to the fatty acid circulation tank. The mixed fatty acid is cooled to 60-70 ° C, and the cooled mixed fatty acid is pumped from the fatty acid circulation pump to the top of the trap. The device flows from top to bottom on the surface of the packing, and is in contact with the high-temperature mixed fatty acid gas flowing from the bottom to the top to complete the heat exchange, so that the mixed fatty acid gas becomes liquid and is collected, and is pumped into the fatty acid workshop as a by-product. Dewaxing: The deodorized oil contains a small amount of wax, and at a higher temperature, the wax is dissolved in the oil in a molecularly dispersed state. The deodorized oil is first pumped into a condensing crystallization tank to cool the crystal, and then the cooled oil pump is pressure-filtered in a plate and frame filter press, and the refined rice bran oil is discharged and poured into an oil storage tank, and the wax is flowed on the filter cloth. In order to achieve the purpose of oil wax separation. Finished product storage: The finished product obtained after refining is temporarily stored in the oil product, pumped into the filling production line, and filled and sold by a small filling machine. Stainless Steel Floor Drain,Stainless Steel Square Shower Drain,Stainless Steel Shower Floor Drain,Stainless Steel Tile Insert Floor Drain Kaiping City Jinqiang Hardware Products Co.,Ltd , https://www.kimpowerdrain.com