Screening of cottonseed oil extraction machines
Cotton seed screening generally includes three aspects: ① separate cold dew seeds and frost seeds according to season; ② separate safflower seeds and white flower seeds according to flower color; ③ separate large tea seeds and small tea seeds according to body shape.
Drying of cottonseed oil extraction machine
The moisture content of cottonseed is too high, the seed shell is weak and not easy to break, and the plasticity is large. In order to facilitate shelling and billet rolling, the cotton seeds with high water content should be dried so that the cotton seeds can reach the moisture (below 9%) which is favorable for shelling.
Shelling of cottonseed oil extraction machines
Shelling of cotton seeds and shelling of broken tea seeds can be carried out by centrifugal shelling and sieving machines. After crushing, the oil crusher is used to make the particle size smaller to facilitate the subsequent embryo rolling process. The shelling equipment should be determined according to the variety of cottonseeds. There are mainly two types of centrifugal impact type and hammer type. Currently, the hammer type shelling machine is widely used.
Cottonseed oil extraction machine-shell separation
Kernel shell separation Kernel shell separation is to separate the kernel from the shell by winnowing. The height of the kernel in the shell is closely related to the shelling equipment. In order to balance the resistance and plasticity of the material in the press chamber, the shell in the kernel should be controlled between 12% and 15%.
Embryo rolling of cottonseed oil extraction machine
Rolling blank is the process of rolling the granular material into flakes and blank material by using a pair of rollers or a multi-roller roller rolling machine. The specific requirements of the oil-rolled embryo are that the rolled sheet is thin and uniform, less powdered, no oil is exposed, and the flakes are loose in the hand and loose in the hand.
The key steps of cottonseed oil extraction machine
The changes and functions of the steaming and frying process of oil material The steaming and frying process can play three roles. One is to allow the grease to be prepared more fully; the second is to reduce the power consumption of oil extraction; the third is to facilitate the production of better quality grease. The steaming of the oil can be carried out by a multi-layer steaming wok. The temperature at the outlet of the lower wok is controlled to be pre-pressed at 100°C, the temperature for one-time pressing is about 120°C, and the moisture is pre-pressed at 2.5 to 4.0%.
Squeezing of cottonseed oil extraction machine
The squeezed temperature of the steamed and fried materials should not be lower than 80℃, and the moisture should be controlled at about 3%. If the temperature is too high, the plasticity will increase; if the temperature is too low, the impedance will increase.
The leaching method of cottonseed oil extraction machine production adopts the following methods:
Concept of oil production by cottonseed oil leaching
Cottonseed oil leaching produces oil by applying the principle of extraction, selecting an organic solvent that can dissolve fats and oils, and bringing them into contact with pretreated oils-soaking or spraying, so that the oils and fats in the oils are dissolved. method.
In this method, the solvent and the oil and fat dissolved by it form a solution. This solution is called mixed oil. Using the different boiling points of the selected solvent and grease, the mixed oil is evaporated and stripped to evaporate the solvent and leave the grease to obtain the crude oil. The evaporated solvent vapor is recovered by condensation and recycled.
Characteristics of oil production by leaching method of cottonseed oil extraction machine
Leaching oil is recognized as an advanced oil extraction method in the world. In summary, it mainly has the following advantages:
1. Low residual oil in meal
When the oil is produced by the pressing method, the pretreatment process cannot completely destroy the oil cells, and the protein denaturation cannot be very thorough; the pressing chamber temperature cannot be very high, and the pressing chamber pressure cannot be very high. Therefore, it is impossible to squeeze out the oil by pressing, and the residual oil rate of the pressed cake is still high. For example, the pressed cake obtained by pressing various oils with ZX•18 oil press has a residual oil rate of 5%-8%. In contrast, using the leaching method to produce oil, whether it is direct leaching or pre-press leaching, the residual oil rate of the leached meal can be controlled below 1%.
2. The quality of the meal is good
Compared with the oil production by squeezing method, in the production of oil by leaching method, due to the relatively low operating temperature of related processes, the denaturation degree of protein in solid materials is smaller, and the quality of meal is correspondingly better. This is very beneficial to the feeding value of the meal or the extraction of vegetable protein from the meal.
3. Low production cost
Compared with squeezing oil production, the production line used in the leaching oil production process is generally relatively complete, with a high degree of mechanization, and is easy to realize production automation. Secondly, there are few operators in the leaching workshop and low labor intensity. Furthermore, the energy consumption of the leaching process for oil production is correspondingly lower. Therefore, the production cost of leaching oil is low.