Cottonseed oil-making process usually uses Cottonseed Oil pre-pressing Machine, Cottonseed Oil Extraction Machine, and Cottonseed Oil Refining Machine. Cottonseeds can be once-pressed and then sent to the cottonseed oil refinery plant directly. For a capacity of more than 20 tons per day, usually, the solvent extraction method is usually adopted with cottonseed oil pre-press used to extract part of the oil. The machine has a large capacity and the cake has a low residual oil rate and is easy for solvent penetration. The pre-pressing and extraction method produces cottonseed oil and crude cottonseed oil refining. The pretreatment steps mainly include cleaning, shelling and crushing, steaming and frying, and pressing. Cottonseed oil refining can remove peptidic impurities, free fatty acids, pigments, odors, and other impurities in cottonseed oil, and improve the stability of cottonseed oil.
Cleaning is to remove the various impurities in the cottonseeds by cottonseed cleaning equipment. Cleaning cottonseeds can reduce oil loss, increase oil yield, and increase the quality of oil, cake, and by-products. reduce the abrasion of equipment, increase the handling capacity, and improve the work environment.
The cottonseed hulls contain brown pigment. pesticide residue, wax, and lint. Hulling cottonseeds can increase the handling capacity of the oil press and increase oil yield, improving the quality of crude oil and meal. Cottonseed hulls can be used for cultivating mushrooms and used as livestock feed, etc.
The flaking process makes the cottonseeds into flakes and destroys the cell walls, which can largely shorten the oil path to increase the oil-yielding speed and oil yield. Cottonseed oil processing plant adopts hydraulic flaking rollers which can guarantee the uniform thickness of the cottonseed flakes.
Cottonseed oil processing plant adopts vertical cookers for the cooking process. The flakes from the flaking roller enter the vertical cooker. By high temperature and high moisture cooking, the temperature and moisture of cottonseed flakes are adjusted, the free gossypol content of the crude oil is reduced and the quality of the crude oil is improved.
Oil pressing is to press the cottonseed kernel into thin slices to increase the surface area of the oil, destroy its cell structure, shorten the oil path, and speed up the oil output. The pressing efficiency of the oil press and the stability of the equipment are the keys to the oil pressing process. The oil press produced by our company has the characteristics of large output, low cake residue, and high cake quality.
GET A QUOTEAfter pretreatment and cold pressing, the material is transported to the extraction workshop. Oil extraction is using the organic solvent to extract oil from the pre-pressed cake inside the oil extractor. Multiple oil extractors such as loop type, rotocel, and towline extractors can be used for the cottonseed oil extraction plant. After oil extraction, miscella and the solvent containing wet meal are obtained. The miscella is pumped into the hydrocyclone to remove the fines and then the miscella enters the miscella tank in the cottonseed oil extraction plant.
The colloidal impurities in crude oil are mainly phosphorus. The presence of colloids such as phospholipids not only reduces the quality of oil but also promotes transitional emulsification between oil and alkali in the alkali refining deacidification process, increasing the difficulty of separation of saponins and aggravating the loss of neutral oil. Therefore it should be removed first.
Oil deacidification mainly removes free fatty acids in crude oil, as well as a small amount of colloids, pigments, and trace metal substances in the oil.
The color of the oil and some other impurities must be decolorized to meet product quality standards. At the same time, it provides more favorable conditions for deodorization and refining. Decolorization must meet the final required color index of the product.
The purpose of oil deodorization is to remove odor-causing substances and other easily volatile substances in the oil, improve the odor and color of the oil, and improve the stability of the oil.
Cottonseed oil refinery machines are divided into three types: batch type, semi-continuous, and full-continuous. They use different capacity oil refining methods, but the final cottonseed oil is all qualified with the standard.
Cottonseed oil fractionation plants can obtain liquid oil and solid fat by cooling crystallization and solid-liquid separation. The plant has the features of advanced technology, fully automatic, high liquid oil yield, and high solid fat purity. Cottonseed oil contains a fair amount of saturated fatty acid and thus has a high melting point. At low temperatures, part of triacylglycerol crystallizes and precipitates, which restricts the application, transportation, and trade of cottonseed oil. By cottonseed oil fractionation, liquid oil and solid fat are obtained. The liquid oil can be used to make mayonnaise and salad dressing. The solid fat can be used to manufacture frying oil, margarine, shortening, cocoa butter substitutes, etc.
Cottonseed oil mill plant has a high automation degree, continuous operation, saving labor.
The pre-pressed cake has a low residual oil rate and is easy for solvent penetration.
The cottonseed oil extraction plant has multiple oil extractors for selection and an advanced mineral oil system.
Adopting a negative pressure evaporation system, saving energy and reducing steam consumption.
Low residual oil rate in the meal, good oil, and meal quality.
The traditional cottonseed oil production process is pre-pressing, extraction, or pressing. Since cottonseed has a high shell content and contains gossypol, it is necessary to peel the shells and use high-moisture steaming and frying during the pre-treatment process to reduce the gossypol content in cottonseed oil.
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