Rice oil machine
Rice bran oil production process:
Rice bran oil pretreatment of rice bran oil machine: The raw rice bran can contain a small amount of impurities and is removed by screening; then it enters the conditioning system and passes a small amount of steam (about 2% of the raw material) into the raw material to soften it and facilitate subsequent production. grain.
Rice oil machine
Rice bran oil production process:
Rice bran oil pretreatment of rice bran oil machine: The raw rice bran can contain a small amount of impurities and is removed by screening; then it enters the conditioning system and passes a small amount of steam (about 2% of the raw material) into the raw material to soften it and facilitate subsequent production. grain.
Granulation: After pretreatment, the rice bran is directly fed into the granulator, the granulated rice bran is cooled, and then the leaching plant is extracted to extract the oil.
Rice bran oil leaching workshop process: the pancake enters the oil extractor, and the solvent is added to the hexane, so that the grease in the pan is dissolved in the solvent to form a mixed oil, and the mixed oil passes through the filter medium (screen), and the solid contained therein At the end of the sorghum, it is retained and a cleaner oil is obtained.
Mixed oil evaporation: the use of oil almost no volatilization, and the low boiling point of the solvent, easy to volatilize, the use of coil heating steam vaporized most of the solvent, so that the concentration of grease in the mixed oil greatly increased.
The mixed oil phase enters the first long tube evaporator tube stage from the mixing tank and the evaporated solvent passes through the separation chamber into a steam condenser; the concentrated mixed oil enters the second long tube evaporator for evaporation, and the vaporized solvent vapor is separated. The chamber enters the two steam condensers. The solvent vapor from the first and second evaporators contains no water, and is directly cooled to the circulating solvent tank after being cooled by the cold exchanger.
This process mainly uses a long tube evaporator, which is characterized by a long heating pipe. After the preheated mixed oil enters the heating pipe from the lower part, it rapidly boils, generating a large amount of steam bubbles and rapidly rising. The mixed oil is also driven by the rising vapor bubbles and pulled as a layer of liquid film rises along the tube wall, and the solvent continues to evaporate during this process. Since the heat transfer is performed in the thin film state, the evaporation efficiency is high.
Stripping: The concentration of the blended oil is greatly increased by evaporation, but it still contains a small amount of solvent oil and is removed by stripping. The mixed oil is immiscible with water, and direct steam with a certain pressure is introduced into the high boiling point mixed oil (the direct steam flux is about 2% of the mass of the material), and indirect steam is introduced into the jacket of the equipment. Heating, so that the direct steam introduced into 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 boils, thereby lowering the boiling point of the high-boiling solvent, and the uncondensed direct steam entrains the distilled solvent together Into the condenser for condensation recovery. After stripping, the obtained crude oil is refined into a physical refining plant.
Dehydration in the wet mash: The mash in the lixiviator filter contains a small amount of solvent and is degassed by passing water vapor through it to remove the solvent. The principle is the same as the stripping of the mixed oil.
The steam from the stripping column and decomposed from the stripping column contains a small amount of water and enters the condenser. The condensed solvent and water mixture flows into the water separator for water separation, and the separated solvent flows into the circulating solvent tank.
Rice bran oil production process
Precipitate Filtration: Hair oil contains insoluble particles, mainly cake residue, silt, grass clippings, etc. It is separated from natural sediment by using its specific gravity with oil.
Hydration degumming: Adding a small amount of water to the oil (adding about 1% to 3% of the weight of the oil), which causes the water-soluble impurities to aggregate and separate from the oil. In hydration, the condensed water soluble impurities are mainly phospholipids, which can be dissolved and dispersed when the hair oil contains no water or contains very few moisture; when the phospholipids are moist and water, the hydrophilic groups of water and phospholipids After the combination, it has stronger hydrophilicity, and the water-absorption capacity is even stronger. As the water absorption increases, the phospholipid spot volume gradually expands and forms a colloidal particle with each other, forming a colloid, and its specific gravity is much larger than that of the oil. Precipitation from oil.
Vacuum drying: Hydrated degummed oil can contain a small amount of water, using a continuous filler dehydrator for dehydration, vacuum drying degree of about -0.09Mpa, to facilitate the subsequent process decolorization.
Adsorption and decoloration: The grease is transferred to the decolorization tank through the storage tank, and is fully contacted with the adsorbent (white clay) sucked by the adsorbent tank under stirring to complete the adsorption balance. Then, the oil is pumped into the filter press to separate the adsorbent after filtration. Decolorized oil is drained into the tank. The adsorption and decoloration time is about 30 minutes, and the amount of white clay added is about 2% of the oil weight.
Dewaxing: Deodorizing grease contains a small amount of wax. When the temperature is high, the wax is dissolved in the oil in molecular dispersion. The deodorized oil is first pumped into a condensation crystallization tank to cool and crystallize, and then the cooled oil pump is pressed and filtered in the frame filter press. The refined rice bran oil is poured out into the oil storage tank, and the wax is flowed on the filter cloth. In order to achieve the purpose of oil wax separation.
Deacidification: decolorized oil is passed through an oil-oil heat exchanger and finally heated to about 250° C. by a heater and enters a deacidification tower. The deacidification tower is a structured packed tower. Oil flows downward from the top under the action of gravity on the surface of the filler. It is fully contacted with the saturated steam injected from the bottom to achieve the purpose of stripping and deacidification. The flow time of the oil in the column is about 5 minutes and the direct steam consumption is 2% of the oil weight.
Deodorization: The deodorizing tower is a structured packed tower. Oil flows downward from the top under the action of gravity on the surface of the filler, and is fully contacted with saturated steam injected from the bottom to achieve stripping and deodorizing purposes. The flow time of the oil in the column is about 15 min, the deodorization temperature is about 230° C., and the direct steam consumption is 1% of the oil weight.
The deacidified and deodorized mixed fatty acids are captured by the structured packing trapping tower and flowed to the fatty acid circulating tank where the mixed fatty acids are cooled to 60-70°C. The cooled mixed fatty acids are pumped by the fatty acid circulating pump into the top of the trapping tower. The device flows from top to bottom on the surface of the filler and contacts the high-temperature mixed fatty acid gas flowing from bottom to top to complete the heat exchange, so that the mixed fatty acid gas is captured as liquid and pumped into the fatty acid plant as a by-product.
Degreasing; Finally, the refined rice bran oil is defatted.
Finished product storage: The finished product obtained after refining is temporarily stored in the oil product filling, pumped into the filling production line, and is filled and sold by a small filling machine.
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