China's largest oil processming machine manufacturer
China's largest oil processming machine manufacturer
Cottonseed oil making process includes: 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 the capacity of more than 20 tons per day, usually, solvent extraction method is adopted with cottonseed oil pre-press used to extract part of the oil. The machine has a large capacity and the cake has 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 production process of cottonseed oil: stripping → cleaning → magnetic separation → shelling → kernel separation →flaking → expansion, steaming and frying → pre-pressing → extraction → refining → defatting and fractionation → mixing with cake and meal
The pretreatment steps mainly include cleaning, shelling and crushing, steaming and frying, and pressing.
Cottonseed cleaning
Cleaning is to remove the various impurities in the cottonseeds by cottonseed cleaning equipment. Cleaning cottonseeds can reduce oil loss, increase oil yield, increase the quality of oil, cake and by-products, reduce the abrasion of equipment, increase the handling capacity and improve the work environment.
Cottonseed shelling
The cottonseed hulls contain brown pigment, pesticide residue, wax, and lint. Hulling cottonseeds can increase the handling capacity of oil press and increase oil yield, improve the quality of crude oil and meal. Cottonseed hulls can be used for cultivating mushroom and used as livestock feed, etc.
Flaking
Flaking process makes the cottonseeds into flakes and destroys the cell walls, which can largely shorten the oil path so that to increase the oil-yielding speed and oil yield. Cottonseed oil processing plant adopts hydraulic flaking roller which can guarantee the uniform thickness of the cottonseed flakes.
Cooking
Cottonseed oil processing plant adopts vertical cooker 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.
Cottonseed prepressing
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.
Pressed cake→Solvent extraction system→D.T.D.C system→Condenser system→Recovery system→Crude cottonseed oil
After cottonseed oil pretreatment & prepressing machine, we can get cottonseed cake. Cottonseed cake can go to the following solvent extraction workshop.
Cottonseed oil solvent extraction plant is the second step in cottonseed oil processing machine .Product (cake from cooking oil press section) is carried into solvent extraction palnt. There are still much oil in cake. Cottonseed oil solvent extraction plant is the machine to extract oil from oil cake which can ensure the residual oil rate is less than 1%.
Cottonseed oil degummingThe 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.
Cottonseed oil deacidification: 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.
Decolorization of cottonseed 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.
Deodorization of cottonseed oil
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 machine are divided into three types: batch type, semi-continuous and full-continuous. They use different capacity oil refining method, but the final cottonseed oil are all qualified with the standard.
The key point of mixed cottonseed oil refining is to control the concentration of cottonseed oil mixture. The best concentration is 65% ~ 70%: the acid-base concentration and the added quantity can be determined by raw material phospholipid content and free fatty acid content. the alkali solution concentration used in mixed oil alkali refining is lower than that used in conventional alkali refining, generally 11% ~ 14%; the reaction temperature cannot exceed the boiling point of the solvent, control at 55~ 60℃; acid reaction time is generally 15~ 20 min, alkali reaction time is relatively longer, general control at 1~ 2h. All the parameters can be adjusted according to the actual color of the oil.
