Corn oil refining equipment
Corn oil refining mainly removal of impurities,to meet the requirements of the oil standards of corn embryo fat, oil produced in the oil process is a mixture of triglycerides containing some other impurities. Such as the leaching of crude oil, but also contains trace solvents, squeeze the crude oil obtained in the mechanical impurities, the need to remove the non-triglyceride components.
Corn oil must go through precipitation, filtration, hydration, deodorization and other processes. Sometimes also need to further refining, such as alkali refining, bleaching, dewaxing and removal of pollutants such as treatment. In particular, when there is pollution, be sure to go through treatment, so as to avoid harmful.
Conventional press press, pre-press - leaching, corn germ oil refining method of leaching, CO2 supercritical fluid extraction of corn germ oil, corn germ as long as fresh, acid value and peroxide value too low, the raw material for a good friend, supercritical extraction corn germ oil after CO2 removal, natural vitamin E content, precipitation, and then filtered to remove mechanical impurities, in line with other indicators index requirement of edible oil, refined oil can be used as packaging. If the moisture content is high, it can meet the requirement by drying. Crude oil refined here mainly focuses on refined corn oil.
Corn oil refining process:
Whether the use of oil press or direct leaching and pre-leaching, the refined oil process equipment used in basically the same.
Crude oil—general refining process—filtration—hydration—deodorization—refined corn oil
Or crude oil—special refining process (alkali refining—bleaching—dewaxing—dehybridization)—refined corn oil
1, precipitation principle, precipitation is based on oil and impurity density of different separation. Crude oil after standing for a certain time, than the oil density of the mechanical impurities, water, etc. can sink to the bottom of the oil. In addition, a small amount of suspended impurities and a small amount of phospholipids, proteins and starch-based pastes can be separated.
2, the equipment used and operation: precipitation is oil drums, oil tanks or mailboxes, the size of the size can be determined according to the processing capacity. The oil which needs to be precipitated is injected into the vessel, and the precipitation can be observed. When the precipitation is considered to be good, the oil and impurities can be separated.
3, the influencing factors: the precipitation effect is mainly affected by temperature and time. High temperature and long time, the precipitation effect is like; low temperature and time is short, precipitation effect is poor. According to local experience, the summer high temperature, after three days of basic precipitation is good; winter temperature maintained at 0 degrees above the environment, precipitation time should not be less than 7 days, spring and autumn, according to the temperature situation, the appropriate control.
1, the filter principle: filtration is in the pump under pressure, so that oil through the filter cloth, and impurities left in the filter cloth. Filtration to mechanical impurities can be reduced to a trace level, you can also remove part of the wax.
2, pressure filtration equipment and operation: commonly used filter press equipment, different models of the frame-type oil filter, supporting a gear pump.
3, the filter technology features: Regardless of which filter press, through the role of pressure, so that crude oil filter cloth filter, so that impurities and wax remain on the filter cloth, and oil through the filter cloth pooled aside, So as to achieve the purpose of filtering. Filtration is intermittent work, first installed filter cloth, and then began to filter, when the pressure reaches the requirements, you can stop the filter, release the filter cloth, clean up the oil residue, thus completing a filter cycle.
4, the impact of factors: filtration and oil filter speed and the viscosity of the oil, crude oil temperature increases, will reduce the viscosity and filter speed. But the temperature increases, the oil will pull, the solubility of proteins and mucus increases, thus affecting the filtration effect. According to experience, filtration of corn oil to less than 25 degrees when the effect is better.
1, hydration principle: hydration is by adding water heating to oil phospholipids, protein, mucus and other impurities separation treatment. That phospholipids will swell after swelling, so that the volume increases, together with the phospholipid protein, mucus and other impurities, the relative density increases and precipitation.
2, hydration equipment and its operation: hydration equipment is mainly hydrated pot and hydration after the dehydration pot. The two structures are basically similar, are with a conical bottom of the cylindrical wok. The upper part of the injection pipe and the oil pipe, the middle of a mixing blade, the pot can put oil shaking his head tube, the bottom of the export of impurities.
Hydration can be high-temperature hydration or low-temperature hydration method.
High temperature hydration method that the corn oil with indirect steam heating, heating to 80 degrees, plus boiling water. There are two kinds of boiling water: one is 5% salt water, the water is 2% -3% of oil; the other is directly heated water. No matter what the water, corn oil should be heated to about 98 degrees and then stop stirring, and then by standing precipitation, the oil into the other pot, and then heated to about 105 ℃, remove the water, cooling after the oil.
The use of low-temperature hydration, 100kg crude oil plus 4kg of water, add water before the first crude oil for mixing, such as mixing wings 60r / min, stirring 10min, stirring while adding water, according to the proportion of water, continue stirring 20min , And then precipitation 24h, you can make the precipitation of phospholipids and other impurities.
Regardless of the method used in hydration, hydration before strengthening the precipitation and filtration, or the degree of powder, affecting the hydration effect. Hydration temperature should be based on how much water to grasp the operation to increase the amount of water to master, a corresponding increase in temperature, add water to reduce the temperature decreases. Plus the amount of water, but also appropriate to master, add water for a long time, likely to cause emulsification. Similarly, the time of stirring and the manner of stirring are also factors affecting hydration. At present, little experience in corn oil hydration, in practice, to explore the law, to strengthen operations to ensure the hydration effect.
Vacuum deodorization is currently used, that is, the steam through the corn germ oil, and then through the vacuum pump will have low boiling point of the odorous impurities (such as aldehydes, ketones and free fatty acids, etc.) and leaching solvent taste off. As the gas out of the water vapor, so also through the gas-liquid separator, atmospheric water droplets condenser will be separated from the air and non-condensable gas discharge, so as to achieve the purpose of removing odor.
The deodorization before the hydration or alkali refining process, can better remove the crude oil in the gum and impurities, for the next deodorization process has created favorable conditions for residual solvents and other odor removal.
This is a process that can be either soda or hydrated and deodorized. Corn oil is first pumped with alkali. As a result of the role of the vacuum pump, so that the deodorizing pot to create a vacuum, the vacuum deodorization, so that the odor and the direct injection of water vapor with the air has been out, adding gas-liquid separator. The gas-liquid separator is an external spin-on clon, where a portion of the condensed water and solvent is separated from the gas. The part of the gas which does not condense then enters the atmospheric condenser, and causes a part of the condensable gas to be condensed by the cold water of the upper part and condensed, and flows into the water sealing tank along the air pressure pipe 7, and the non-condensable gas is discharged from the upper outlet of the condenser Pumped to the gas-liquid separator, and further separated from the water droplets can be separated, while the air and non-condensable gas is finally discharged by the vacuum pump.
Main process equipment structure
Deodorizing the work of the process is to deodorize the crude oil into the pot later, by indirect steam heating of the coil, and by the steam nozzle into the direct steam, and then by pulling the vacuum effect, so that odor and water vapor together Sucked out, so as to carry out deodorization process work.
The Structure of Atmospheric Condenser
The atmospheric condenser is a major deodorizing process equipment. Which allows the condensable portion of the withdrawn gas to be separated from the air and non-condensable portions.
The working process of the atmospheric condenser is that the gas extracted from the deodorizing kettle is introduced into the gas inlet pipe and the gas is upwards to encounter the water which enters from the water inlet pipe and overflows from the shower board so that the condensable gas in the gas can be condensed Partly from the lower outlet pipe, while the air and non-condensable gas is drawn from the upper part. Pneumatic tube directly from the atmospheric condenser water seal the pool. The pressure head produced by the liquid column in the pneumatic tube corresponds to the difference between the outside atmospheric pressure and the pressure in the condenser. The height of the pneumatic pipe must be higher than 10m above the surface of the water seal pool.
Vacuum is the main equipment to complete the vacuum deodorization, the current commonly used vacuum pump W-type, the production process can be carried out according to the size of matching.
Vacuum deodorization operation
Operation, must be greater than or equal to 1.0MPa in vacuum, oil temperature is greater than 140 ℃ when the vacuum, vacuum time should not be less than 3 ~ 4h to do. Superheated steam pressure to reach 1.0MPa, in the oil temperature reached 100 ℃ when the jet. For direct leaching and pre-leaching of corn oil, be sure to intensify the operation to completely remove the solvent flavor.
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