The processing technology of sunflower oil are generally: pressing, leaching, and refining process.
The oil is extracted directly from the sunflower seeds by a screw type oil press machine. Sunflower seeds are cold-pressed (or hot pressed) at a certain temperatures, and the protein-rich cake that remains after the seeds are processed into oil is used as animal feed, retaining 99% of the nutrients in sunflower oil without the use of chemical solvents.
In the modern oil industry, they use chemical solvents (such as hexane) to extract sunflower oil, and refined by solvent extraction,degumming, neutralization, bleaching and other processes. Sunflower oil has high oil yield and high economic benefits, and the daily output can reach 300-3000 tons.
Dingsheng Machine is a leading manufacturer specializing in edible oil processing solutions and equipment in China. We provide customers with equipment for the entire process from raw material processing to oil extraction, refining, and filling, and provide technical guidance, services and training, help customers to build efficient and intelligent sunflower oil processing plants.
Process
1, SUNFLOWER SEED PRETREATMENT PROCESS
Cleaning → shelling → flaking → steaming → pre-pressing → pressing→ Sunflower Oil And Cake
A. Cleaning: Use magnetic separators, cleaning sieves and stone removers to remove iron filings, stones, grass, soil and other impurities in sunflower seeds.
B. Shelling: Use a shelling machine to remove the shells of sunflower seeds to prevent the shells of sunflower seeds from absorbing oil, so as to reduce oil loss.
C. Flaking: The peeled sunflower seeds will be transported into the flaking machine, and the sunflower seeds are rolled into thin slices, which destroys the cell tissue and makes it easier for the oil to flow out.
D. Steaming and frying: The steaming cooker can adjust the temperature, humidity and internal structure of sunflower seeds, and can produce better oil when pressing.
E. Pre-pressing: The fried sunflower seeds will be sent to the pre-pressing machine for pressing, and a part of the oil is extracted firstly, which can increase the yield of sunflower oil. The oil content of the pre-pressed sunflower cake is 15%, which can be extracted by leaching process, or sent to the press machine for secondary pressing.
F. Pressing:The oil press machine makes the oil in the sunflower cake flow out through the external force of mechanical extrusion, so as to obtain the pressed sunflower oil. The residual oil rate of sunflower seed cake after pressing is about 6%. After pre-pressing, part of the sunflower oil and sunflower seed cake will be obtained.
2, SUNFLOWER SEED CAKE SOLVENT EXTRACTION PROCESS
Sunflower Oil And Cake → Extractor → Solvent Recovery → Steam And Remove Wet Meal → Mixed Oil Treatment → Crude Oil And Meal
Sunflower oil cake leaching: the sunflower seed cake is sent to the (leaching equipment) extractor through the conveying equipment, and after solvent leaching, the mixed oil containing the solvent and the wet meal containing the solvent are obtained.
Desolvation and drying of wet meal: The sunflower meal contains 25% to 35% of the solvent. In order to recover these solvents and obtain the sunflower meal of better quality, we use desolventizer toaster to desolvation drying the solvent.
Evaporative stripping of mixed oil: The mixed oil contains oil and solvent. The solvent and oil are mutually soluble and the boiling points are different, so the solvent can be separated from the mixed oil by the evaporator and the stripper.
Solvent vapor condensation recovery process: Through condensation recovery, the solvent separated from the wet meal and the mixed oil can be recovered and reused, which reduces the solvent loss in the leaching process and reduces the cost of sunflower oil production.
3, CRUDE OIL REFINING PROCESS
Sunflower Crude Oil → Alkali Refining → Degumming → Centrifugal Drying → Continuous Decolorization → Dewaxing → Continuous Deodorization → Filtration → Finished Sunflower Oil
Sunflower Crude Oil → Alkali Refining → Degumming → Centrifugal Drying → Continuous Decolorization → Dewaxing → Continuous Deodorization → Filtration → Finished Sunflower Oil
Degumming process:
The peptizing impurities in sunflower oil not only affect the stability of oil, but also affect the technological effect of oil refining and deep processing. Peptide impurities will cause emulsification of oil in the alkali refining process, increase the difficulty of operation, increase the loss of oil and lye, and reduce the quality of soapstock; in the process of decolorization, peptoid impurities will also increase the consumption of adsorbents , reduce the bleaching effect.
Deacidification process
The deacidification process is mainly used to remove free fatty acids in sunflower oil. The common method of deacidification is alkali refining. The lye can neutralize the free fatty acids in sunflower oil, and the resulting sodium salt is not easily dissolved in the oil, and becomes flocculent and settles. The resulting sodium salt is a surfactant, which can bring a considerable amount of other impurities into the sediment, such as proteins, mucus, pigments, phospholipids and substances with hydroxyl and phenolic groups. Even suspended solid impurities can be carried down by the flocculent soap mass.
Decolorization process
Decolorization of sunflower oil is commonly performed by adsorption decolorization. The principle of the adsorption decolorization method is to use the adsorbent with strong adsorption force to adsorb pigments and other impurities in hot oil, and to remove the adsorbed pigments and impurities while filtering and removing the adsorbent, so as to achieve the purpose of decolorization and purification. Our commonly used adsorbent is activated clay.
Deodorization process
After sunflower oil is deacidified, there will still be trace amounts of aldehydes, ketones, hydrocarbons, low-molecular-weight lipids, oxides of glycerol phenol, clay, and residual solvent odors after decolorization. The process of removing these odors is called deodorization process. During deodorization process, high-temperature direct steam should be introduced into the oil first, and the difference in volatility between grease and odorous substances should be used to remove these substances, thereby completing deodorization process.
Dewaxing process
The wax in sunflower oil will affect the flavor and taste of the oil, which requires the operation of the dewaxing process. At present, the frozen crystallization method is basically used in the production of edible oil. After dewaxing process, we will obtain the first-class sunflower oil that meets the national standard.
Technology Feature
Benefits of our professional solutions for sunflower oil processing equipment
The complete set of sunflower seeds pretreatment equipment is full continuously and mechanized operation, ensure advanced process indicators, while reduces equipment investment, such as land cost, operating and maintenance costs.
The leaching workshop adopts the international level leaching system and low temperature desolventizing machine, achieve higher mixed oil concentration and lower residual oil. Reduce the amount of solvent circulation, energy and dissolution consumption, thus ensuring the lowest level of residual oil and dissolution consumption.
The fully closed operation system of the leaching workshop, the full negative pressure evaporation avoids oil oxidation; the separation of crude oil and solvent can be realized at a lower temperature condition, which ensures the quality of leaching crude oil, improves the refining rate and significantly reduces energy consumption.
The advanced physical refining process reduces the loss of refining oil and improves the oil quality. The by-products – fatty acids can be directly obtained, helping factories realize the economic benefits of sustainable development. There is no waste water pollution during the process, while meeting the environmental and health requirements.
