Soybean oil refining uses continuous oil refining methods in general. Refining of soybean oil processing
uses solvent oil (No.6 light gasoline) to extract in the high temperature after oil raw material is fully immersed, through the 6 steps (i.e., degreasing, degumming, dewatering, decoloring, deodorization, deacidification). The biggest characteristics is a efficient oil producing and low production cost. it is also the one of the reasons that the price of soybean salad oil is lower than the pressed oil.
In terms of nutritional value, soybean oil contains 7-10% palmitic acid, 2-5% stearic acid, 1-3% arachidic acid, 22-30% oleic acid, 50~60 linoleic acid, 5-9% linoleic acid. Fatty acid composition of soybean oil is good, containing rich linoleic acid, and significantly reduce serum cholesterol, prevent cardiovascular disease. Soybean also contains rich amount of vitamin E, vitamin D and more lecithin, which are very beneficial to human body health. In addition, human digestion absorption rate on soybean oil is as high as 98%. Soybean oil is also a kind of high nutritional value cooking oil.
Soybean oil continuous degumming, desolventizing refining process:
Continuous soybean oil refining process mainly uses the centrifuge equipment. The process is as follows:
Leaching soy crude oil, filtering, phosphoric acid mixing, mixing and reacting (water), centrifugal separation, heating, flash, desolventizing, cooling, secondary soybean oil
The main equipment selection based on soybean oil refining process characteristics. First of all, the centrifuge is self-cleaning centrifuge to ensure the separation effect. The mixer adopts blade mixer and static mixer. Blade mixer’s mixing degree is combined into hydratable phospholipids. Then add the hot water; use the static mixer to mix; phospholipids water is sufficient, creating conditions for the centrifugal separation. Mixed oils and fats have enough time and space to fully react in the reactor to form ideal flocculent oil angle, making the centrifugal separation effect obvious.
The oil after degumming enters into continuous desolventizing tower to further remove solvents. The solvent tower is thin film packing type. Its working principle is to make oil overflow to the packing. Grease flow down on the corrugated packing in the form of thin layers, and contact the bottom bottom-up dry steam to process gas-liquid contact and mass transfer.
Under vacuum condition, residual solvent of oil evaporates into the gas phase discharging device. By the processing of this device, residual solvent of leaching soybean oil is basically clean. Because the oil in the device is gas stripping in the form of thin film, desolventizing effect is good, and desolventizing time within 2-5 minutes. Soybean oil quality is fully ensured. Continuous degumming, desolventizing technology ensure the high quality soybean oil refining
Technical index test:
From the index test of raw materials of vacuum pressure evaporation leaching soy oil continuous degumming, desolventizing process, the high quality of soybean refined oil indicator is as follows:
For example, 100 t/d continuous degumming, desolventizing technology economic indicators:
Power consumption: 65 Kw.h/t (soybean oil)
Gas consumption: 100 kg/t (material)
Water consumption: 0.4 L/D
Soybean oil refining rate: 97%
Oil foots oil content: 25%
Oil foots water content: 35%
The advantage of soybean oil refining process, continuous degumming and desolventizing:
Soybean oil’s continuous degumming and desolventizing in soybean oil refining process is reliable. One-time hydration can meet the requirements of the secondary soybean oil quality index. Continuous desolventizing also can meet the requirements of the secondary oil quality. Superiority Continuous degumming and desolventizing is various in production:
Short reaction time;
Rapid separation technology;
Minimum phenomena of oil foots and oil emulsification.
Oil foots oil content below 25% adopting mechanical centrifugal separation. Smelting oil foots are separated by natural sedimentation, containing large amounts of neutral oil, generally more than 35%. Soybean oil refining has the advantages of high oil yield. Continuous degumming and desolventizing is made within the sealing equipment. Soybean oil refining equipment hardly contact with the air, so oxide of grease is greatly reduced, and the color of soybean oil is greatly improved. Dehydration temperature is low.