Soybean oil extraction production line

Soybean oil extraction production line
Soybean oil extraction production line The soybean oil extraction production line is generally processed by various methods such as squeezing and extraction methods to obtain crude oil with more impurities, and then refined to obtain edible refined oil.

Soybean oil extraction production line
The soybean oil extraction production line is generally processed by various methods such as squeezing and extraction methods to obtain crude oil with more impurities, and then refined to obtain edible refined oil.
The squeezing method of soybean oil extraction production line is divided into ordinary squeezing method and spiral squeezing method. The common pressing method is a method of pressing on soybeans. This method is not widely used, especially in industrial mass production. The screw press method is to install a screw shaft in the cylinder of the horizontal device. After the pretreated soybean enters the screw press; the oil is squeezed out while advancing. This method can be produced continuously, but during the oil extraction process, due to friction and heating, the protein changes to a greater extent.
Soybean oil extraction production line oil extraction method is to use a solvent that can dissolve fats and oils, through the effects of wetting and penetration, molecular diffusion and convection diffusion, the fat in the blank is leached out. Then, the mixed oil composed of solvent and fat is separated, and the solvent is recovered to obtain crude oil. The most common application in the actual production of my country’s oil industry is the extraction method. The solvents include several aliphatic hydrocarbons such as n-hexane or light gasoline. Among them, light gasoline is the most used solvent, but the biggest disadvantage is that it is flammable and explosive, the composition is complex, and the boiling point range is wide. Oil extraction rate of extraction method is up to 99%
Soybean oil extraction production line method difference
The processing technology of soybean oil extraction line is different
The processing technology of squeezed oil is “physical squeezing method”, while the processing technology of extracted oil is “chemical extraction method”. The production process of the physical pressing method requires the selection of raw materials. The oil is crushed, steamed and squeezed after removing impurities and stones, so that the oil is separated from the oil. The seeds are added during the pressing process and after being pressed by the press , Made with high-tech natural filtration purification technology. Maintaining the original taste of soybeans, mellow flavor, rich in vitamin E, long shelf life, no additives, no solvent residues and soap content, it is a pure natural green food produced by the combination of modern technology and traditional technology . The extraction method adopts organic solvent extraction method, by fully combining the oil and organic solvents such as “No. 6 Light Gasoline” (commonly known as “No. 6 Solvent Oil”), the organic substances such as n-ethane, which is toxic to the human body, are extracted. It is difficult to completely remove, and only after refining reaches very strict standards, can you rest assured to eat, otherwise, it is easy to have a harmful effect on the human body; but in high-temperature refining, some vitamins and nutrients will inevitably be lost. In my country, except that part of the soybean oil is produced by a squeezing process, most of the corn oil, soybean oil, cottonseed oil, etc. are basically processed by the “No. 6 Light Gasoline” extraction method due to the high oil extraction rate.
Soybean oil extraction line has different nutrients
Pressed soybean oil has the characteristics of complete color, fragrance and flavor, and retains the characteristics of various nutrients. Extracted oil is colorless and odorless, and most nutrients are destroyed after processing. The edible oil standard drafted by the State Food Administration of China has been issued and implemented, and the old standard used in my country has been cancelled. The new standard stipulates that the words “pressed” and “extracted” must be marked on the product label for pressed soybean oil and extracted soybean oil. With the progress of society and the improvement of people’s living standards, diet and nutrition have become the pursuit of people. The transparent production process of soybean oil is to let consumers understand the production process of soybean oil and give consumers the right to know. Give the consumer the choice.
Soybean oil extraction line has different raw material requirements
“Squeezed soybean oil” uses a pure physical pressing method, which retains the original flavor of soybean and original juice, so the requirements for soybean raw materials are very strict, the raw materials require fresh, low acid value and peroxide value, so the price is relatively high; Only by pressing, the residual oil in the soybean cake is high, and the oil yield of the pressed oil is relatively low. So the price of pressed soybean oil is relatively high

Process flow of soybean oil extraction production line
Soybean oil cleaning → screening → air separation → specific gravity method stone removal → magnetic separation → side-by-side mud cleaning → dust removal → soybean moisture adjustment → crushing → softening → rolling billet → soybean extrusion puffing → soybean oil extraction → mixed oil treatment →Purification and preheating of mixed oil→Evaporation of mixed oil→Stripping of mixed oil→Crude oil of soybean (crude oil)→ Filtration→Hydrate degumming→Alkali refining and deacidification→Decolorization→Deodorization→ Product oil
If the process requires the extraction of phospholipids, the crude oil needs to be cleaned, rehydrated, and the degummed gum concentrated before rehydration and degumming. dry.
Raw material cleaning of soybean oil extraction production line
Purpose and requirements: Some impurities will be mixed into the oil during harvest, transportation and storage. Although the oil is usually preliminarily cleaned before storage, the oil after the initial cleaning will still carry a small amount of impurities, which cannot meet the requirements of oil production. Therefore, the oil should be further cleaned after entering the production workshop to reduce its impurity content to the process Within the required range, to ensure the effect of oil production technology and product quality.
Cleaning method:
① Screening:
Screening is the use of the difference in particle size of oil and impurities, with the help of the relative movement of the impurity-containing oil and the screen surface, the impurities larger or smaller than the oil are removed through the screen hole. The commonly used screening equipment for soybean oil extraction production line includes vibrating screen, plane rotary screen, rotary screen, etc. Most screening equipment has an important working component, namely the screen surface. The choice of mesh size and mesh shape should be determined according to the actual size of the soybean particles.
②Wind election:
According to the difference in specific gravity and aerodynamic properties of oilseed soybeans and impurities, the method of separating impurities in oil by wind is called wind separation. Air separation can be used to remove light impurities and dust in oil, and can also be used to remove heavy impurities such as metals and stones. Generally, the air separation equipment selected by oil plants is mostly used in combination with screening equipment, such as suction flat screen, vibration cleaning Sieve, plane rotary drying, etc. are equipped with air separation device.
③Degraving by specific gravity method:
This method is based on the difference in the specific gravity and suspension speed of oilseed soybean and stone, using the combined action of inclined screen surface with certain motion characteristics and the airflow passing through the screen surface to achieve the purpose of graded stone removal. Soybean oil extraction production line commonly used suction-type specific gravity stone removal machine, which is characterized by negative pressure inside the stone removal machine during work, which can effectively prevent dust from rising, and the single machine has a large output, but it needs to be equipped with a separate suction and dust removal system. The blower gravity stone removal machine is equipped with a fan and has a simple structure, but the working conditions are poor and the output is small, which is only used in small grease processing plants.
④ Magnetic separation:
Magnetic separation is a method that uses magnetic force to remove magnetic metal impurities in soybeans. The application of magnetic separation is to use the magnetic difference of various ores or materials to perform the selection process under the action of magnetic force and other forces. The equipment generally used for magnetic separation includes permanent magnetic drum magnetic separator, cylindrical magnetic separator, rotating drum iron suction machine, and charged electromagnetic iron suction machine.
⑤ Side by side mud cleaning:
Mud blocks with shapes and sizes similar to or equal to soybeans, and having a specific gravity similar to soybeans are called side-by-side muds. Rapeseed, soybean, and sesame are more abundant in side by side mud. When cleaning the side-by-side mud, the mechanical performance of the sludge is different. First, the oilseeds containing the side-by-side mud are ground or blown to crush the side-by-side mud, that is, the ground mud, and then the mud ash is screened or air-selected. The equipment used in the grinding of soybean oil extraction production line mainly includes rubber roller grinding machine, vertical round sieve and so on.
⑥Dust removal:
The dust contained in the oil not only affects the quality of the oil and meal, but also rises during the cleaning and transportation of the oil. These flying dust pollute the air and affect the environmental hygiene of the workshop, so they must be removed. The method of dust removal is to first close the dust source and reduce the influence range of the dust, and then set up a dust removal air network to collect the dusty air and remove the dust in it. The dust collectors commonly used in the soybean oil extraction production line include centrifugal dust collectors and bag dust collectors. Here, considering the cost and other factors, a centrifugal dust collector is used.
Soybean Moisture Adjustment in Soybean Oil Extraction Production Line
Oil moisture affects the physical properties of oil, such as elasticity, plasticity, mechanical strength, thermal conductivity, and organizational structure. These physical properties of oil directly affect the processing effect of oil. Oil moisture will also affect the activity of various enzymes in the oil, and the role of enzymes can change the properties of certain components in the oil, which in turn affects the quality and yield of products and by-products. If the humidity of the oil is too high, it should be dried. Generally, convection drying and conduction drying are used. If the humidity of the oil is too low, it must be humidified. Generally, it is mixed with saturated steam and water and sprayed onto the oil material being transported, which can obtain a better wetting effect, and the time for the moisture to be uniform is also short.
Breaking of soybean oil extraction line
Before the soybeans are rolled, the large-grain soybeans must be crushed. The purpose is to make the soybean have a certain particle size through crushing to meet the condition of rolling billet. The surface area of ​​the soybean after crushing increases, which is beneficial to the transfer of temperature and moisture during softening, and the softening effect is improved. It is required that the soybeans have a uniform particle size after crushing, no oil, no agglomeration and less powder, and the particle size meets the requirements. The crushed particle size of soybeans is 4~6 petals, and the powder degree of crushed beans is controlled not to exceed 10% through a 20 mesh/inch screen. The maximum diagonal length of the prepress cake after crushing is 6~10mm. In order to meet the requirements of crushing, the moisture content of the oil during crushing must be controlled. If the moisture content is too high, the oil is not easy to break, and it is easy to be crushed. Oil out. It will also cause the crushing equipment to be unsuitable for feeding, reduce production, etc.; if the moisture content is too low, the powder of the crushed oil will increase, and the oil-containing powder will easily stick together to form a mass. In addition, the oil temperature will also
The crushing effect has an impact. The crushed powder of hot oilseeds is small, and the crushed powder of cold oilseeds is large. Generally, the suitable moisture content of soybeans is 10% to 15%. There are several methods for crushing oil, such as impact, shear, extrusion and grinding. The crushing equipment commonly used in soybean oil extraction production line includes tooth roller crusher, hammer crusher, and disc sheller.
Softening of oil in soybean oil extraction line
Softening is to improve the elastoplasticity of the oil by adjusting the moisture and temperature of the oil, so that it has the best conditions for rolling the billet, reducing the powderiness and sticking roller phenomenon during rolling, and ensuring the quality of the billet. Softening is mainly used for oil materials with low oil content, low water content and high shell content, which have poor plasticity and hard texture. Soybeans have low oil content and poor plasticity, and are generally softened before rolling. The billet temperature should be determined by the moisture content of the soybean. When the moisture of soybean is 13%~15%, the softening temperature is usually controlled at 70~80 degrees, and the softening time is 15~30 minutes. The softening equipment commonly used in the soybean oil extraction production line includes a layer softening pot and a drum softening pot.
Rolled billet of soybean oil extraction production line
The rolling billet of the soybean oil extraction production line is the process of pressing the oil material from granules to flakes by mechanical action. The purpose of rolling the billet is to destroy the cell structure of the oil, increase the surface area of ​​the oil, shorten the distance of the oil outflow, which is beneficial to the extraction of oil and fat and to improve the evaporation effect. Rolling billet is the key to pretreatment, which is related to the yield and quality of grease. The key to billet rolling is again the operation of the billet rolling machine. In order to ensure the quality of the billet, the moisture and temperature of the material before the billet must be strictly controlled. It is better to install a softening box on the billet rolling machine to avoid excessive loss of moisture and temperature after softening. Before starting the machine, you should carefully check the working condition of the billet rolling machine. If you find that the thickness of the billet at both ends is uneven, or the unrolled oil is mixed into the billet, you should stop to check and adjust the rolling distance (should be balanced on both sides and avoid adjustment Too tight). Check whether the scraper is tightly attached to the surface of the roll to prevent sticking. Pay attention to the uniformity of flow to prevent no-load operation. Generally, the thinner the oil is rolled, the more the cell tissue is destroyed, and the better the oil extraction effect. The requirements for rolling the billet are that the billet is thin and uniform, the powder is small, and there is no oil leakage. Regardless of whether the extraction method is oil extraction or extraction, the thickness of the billet has a great influence on the oil yield. Effect of Bean Blank Thickness on Pressing Oil Yield
Generally, the thickness of rolled billet of soybeans is 0.3mm or less. Billet rolling equipment can be divided into in-line billet rolling machine and in-line billet rolling machine. There are two types of in-line billet rolling machine: three-roll billet rolling machine and five-roll billet rolling machine. The in-line billet rolling machine has two types: single-pair billet rolling machine and double-pair billet rolling machine.
Extrusion and expansion of soybean oil extraction production line
Extrusion of fats and oils is the process of converting crushed, rolled billets or whole oil into porous expanded particles by using extrusion equipment. Extrusion is a high-temperature, short-term treatment process. Commonly used extruders are single-screw and twin-screw, and can be divided into wet and dry extrusion methods according to the water content during extrusion. The pretreatment of the extrusion of the oil is mainly processed by a single screw extruder with a low moisture wet method, that is, the oil is cleaned and rolled into the extruder, and extruded by heating, pressurizing, gluing and decompression, and expanding forming. Generally speaking, during the extrusion process, the extrusion temperature can reach about 110-200 ℃, the residence time in the extruder is l-3min, the short is only 5-105. After the oil is extruded at high temperature and humidity, the following purposes can be achieved: (1) The starch is gelatinized and the protein is denatured. Due to the expansion, the cell structure can be quickly and completely destroyed, the oil diffuses out evenly, and it is easy to extract. (2) It can inactivate various enzymes, especially fat hydrolase, oxidase, etc. After extrusion, the inactivation rate is over 95%. (3) It can increase the oil yield, increase production, and reduce solvent loss. Oil extrusion extrusion equipment: There are two main types of oil extrusion extrusion equipment, one is an extruder for low-oil-containing green bodies, the so-called closed-wall extrusion extruder, and one is for high-oil-containing materials The green extruder, the so-called slotted wall extruder.
The extruded chemical section is suitable for the extraction process of soybean meal as fish feed, which can relatively increase the bulk density and increase the processing volume. But it is not suitable for the later extraction process of soybean protein. Later, if soy protein isolate or soy protein concentrate is extracted. Soy flakes dried after pressing the embryo can be directly extracted by low temperature.
Soybean oil extraction line oil extraction
7.1 Basic principles and elements of oil production by extraction
Soybean oil extraction production line The extraction method of oil production is to use a solvent that can dissolve oil and fat. The oil in the embryo is leached out by wet penetration, molecular diffusion and convection diffusion, and then the mixed oil composed of solvent and fat is separated and recovered To obtain crude oil from the solvent, the solvent in the soybean meal is also recovered to obtain the extracted meal. In this process, the basic elements are the solvent and the embryo, as well as the extraction method and process parameters that determine the extraction effect.
1. Selection of solvent
The ideal extraction solvent should meet the following basic requirements:
①Can dissolve grease in any proportion at room temperature or low temperature;
② The selectivity of the solvent is better, that is, it does not dissolve other components except grease.
③The chemical properties are stable, stable to light and water, and cannot change chemically after heating, evaporation and cooling.
④ The solvent is required to have a low boiling point, a small specific heat and a small latent heat of vaporization, and is easy to separate and recover from the meal and oil.
⑤ The solvent itself is non-toxic, neutral, odorless, and non-polluting.
⑥ No chemical reaction occurs between the solvent and oil, meal and equipment materials. The most common extraction solvents used in the actual production of China’s oil industry are several aliphatic hydrocarbons such as industrial hexane or light gasoline. Among them, light gasoline is the most widely used solvent in China. It is a low-boiling fractional distillation product of petroleum raw materials, which meets the above basic requirements for solvents. But the biggest disadvantage is that it is flammable and explosive. When the air content reaches 1.25 to 4.9%, there is a danger of explosion. At the same time, the composition of light gasoline is complex and the boiling point range is wide. In addition, acetone, methyl ethyl ketone, isopropyl alcohol, butane, and some complex solvents can be used for oil extraction, and some have been tried in research.
2. Requirements for the material embryo
After the pretreatment of soybean raw materials, the structure and properties of the feed embryos should meet the requirements of the extraction process to obtain good extraction results.
① The more complete the cell destruction, the better.
②The material embryo is thin and strong, and the powder is small. In this way, the extraction distance is short, and the contact area between the solvent and the feed stock is large, which is conducive to improving the leaching efficiency. Soybean direct extraction method requires feed embryo thickness of 0.2 ~ 0.3mm.
③ Moisture is suitable, and the extraction solvent is insoluble in water. If the moisture in the feed stock is high and the internal voids are filled with water, it will affect the penetration of the solvent and the dissolution of grease. Therefore, the moisture content of feed stock should be low. (<13%, 5~7%) ④ Appropriate temperature, high temperature of feedstock, low viscosity of grease, easy to flow, and good extraction effect, but it should be noted that the temperature of feedstock should not exceed the boiling point of the solvent, so as not to vaporize the solvent. Therefore, the temperature of the feed stock is generally controlled at 45 to 55°C, and should not exceed 60°C.
7.2 Extraction process
The solvent extraction of soybean oil extraction production line is the main process of oil production by extraction method. In the extraction process, through a specific extraction device, in a reasonable extraction method, the solvent and the embryo are fully contacted, so as to fully dissolve the oil and extract the oil. Good extraction effect is guaranteed by the correct extraction method and appropriate extraction process conditions.
(1) The extraction method refers to the contact method between the solvent and the feedstock during the oil extraction process. There are three types:
①Immersion type: The embryo is always immersed in the solvent (or dilute mixed oil) to complete the leaching process. In this way, the extraction time is short, the amount of mixed oil is large, but the concentration is relatively thin, that is, the oil content in the mixed oil is small, and the residue in the mixed oil is large.
②Percolation type: The contact process between the solvent and the feed stock is always in the spray-infiltration state. After extraction, a thick mixed oil containing a lot of oil can be obtained, and the slag content in the mixed oil is also small. But the extraction time is longer.
③Immersion and spraying mixed type: soak the material embryo first, and then spray and infiltrate, which improves the extraction rate and oil extraction efficiency, and reduces the extraction time. According to the type of extractor, the extraction method is divided into batch type and continuous type, and the extraction method of the soaking kettle is batch type.
The other commonly used extractors are continuous. However, no matter what kind of extraction method, the countercurrent extraction process is basically adopted. In the solvent extraction process, the oil content in the feedstock is continuously extracted by solvents of different concentrations, so that the residual oil in the meal is gradually reduced until the specified index, and the concentration of oil in the solvent is gradually increased in the reverse direction and finally discharged for recovery.
(2) Extraction process conditions of soybean oil extraction production line
① The extraction temperature and extraction time, the extraction temperature requirements are consistent with the temperature of the feed blank, the solvent should be preheated first. Theoretically speaking, the longer the extraction time, the better the effect and the lower the residual oil in the meal. In actual production, the oil extraction process can be divided into two stages. The first stage is mainly to dissolve the oil in the damaged cells by the solvent. The extraction amount is large and the time is short, generally only 15-30 minutes, the total oil content can be extracted 85~90%; the second stage requires the solvent to penetrate into the cells that have not been destroyed. The time is long and the efficiency is low. The best “economic time” should be considered according to the actual situation.
② The penetration rate of the solvent, the amount of solvent that passes through the unit area per unit time, that is, the penetration rate, it is generally believed that the soybean extraction process, the penetration rate is preferably 360 liters/dm 2 • hour.
③ The amount of solvent to solvent ratio, the amount of solvent is usually measured by “solvent ratio”, the definition of solvent ratio is the ratio of the weight of the solvent used to the weight of the material being immersed per unit time. The size of the solvent ratio directly affects the technical parameters such as the concentration of the mixed oil after extraction and the concentration difference of the mixed oil inside and outside the embryo, the extraction rate, and the residual oil rate during extraction. Generally, the solvent ratio of the multi-stage mixed extraction is (solvent: material) Within the range of 0.3~0.6:1.
④Draining time and dissolved content of wet meal. After the extraction process is completed, it is always hoped that the residual solvent in the meal is as small as possible to reduce the equipment load for soybean meal desolvation. Therefore, the draining time should be properly extended. The limit of the wet meal extracted from soybean embryos is 25-30%, and the draining time is about 20 minutes.
(3) Type of extractor in soybean oil extraction production line
It can be broadly divided into continuous type and intermittent type. According to the extraction method, it can be divided into immersion type, osmotic type and mixed type. The equipment of each extraction method is divided into many types of structure. The single-kettle and multi-kettle combined types have been gradually eliminated due to intermittent production and high labor intensity. The flat-rotation type and ring-type drag chain type have high extraction efficiency and advanced technology, which have been widely used, but the cost is higher.
7.3 Dehydration of wet meal
The “wet meal” coming out of the extractor usually contains 21 to 40% of the solvent. It must be desolvated and dried to finally recover the solvent in the meal and reduce the water content, so that it reaches the specified residual solvent content index (500 to 1000 ppm) and Store moisture safely. The process of recovering the solvent is called desolvation, and the process of drying the water is called roasted meal.
1. The basic process of solubilized roasted meal in soybean oil extraction production line
In the desolvation stage, direct steam is mainly used to pass through the material layer. After the two contact heat transfer, the solvent is boiled and evaporated. Direct steam is used as a heat source to heat the solvent, and it is steamed together with the solvent under pressure. But at the same time, the steam will partially condense into water droplets and remain in the meal while heating the solvent, which increases the moisture of the soybean meal; so it needs to be treated by the baking meal to remove the moisture. The baking meal is generally heated by indirect steam to remove the moisture.
1. The basic process of solubilized roasted meal in soybean oil extraction production line
In the desolvation stage, direct steam is mainly used to pass through the material layer. After the two contact heat transfer, the solvent is boiled and evaporated. Direct steam is used as a heat source to heat the solvent, and it is steamed together with the solvent under pressure. But at the same time, the steam will partially condense into water droplets and remain in the meal while heating the solvent, which increases the moisture of the soybean meal; so it needs to be treated by the baking meal to remove the moisture. The baking meal is generally heated by indirect steam to remove the moisture.
2. The basic method of desolvation roasted meal of soybean oil extraction production line
①The high-temperature desolvation method uses direct steam with a gauge pressure of 0.5 kg/cm2, steams for 30 to 40 minutes through a material layer of about 1.5 m thick, and then dries the water with indirect steam with a gauge pressure of 4 to 5 kg/cm2. In order to achieve the required moisture content. The meal temperature is above 105℃. This meal protein denaturation is seriously detrimental to the further processing and utilization of protein. Generally used directly as a feed hopper
② Flash evaporation pre-desolvation (low temperature desolvation) method, using high-speed flowing superheated solvent steam to blow the wet meal to the cyclone separator to remove the solvent in a very short time. The desalted meal enters the feeder by its own weight, and evenly enters the steaming and cooling cooler. The steam cooler maintains a vacuum of 200-400 mmHg, the upper part is stripped of residual solvent with a small amount of direct steam, and the lower layer is blown with dry cold air to remove moisture. In this way, the soybean meal is heated for a short time, the steaming temperature is low, and there is no direct effect of steam. The temperature of the meal does not exceed 70-80 ℃, so the protein denaturation rate is low, only 1-2%, which is conducive to the further development and utilization of protein. It is suitable for processing and extracting soybean protein again.
③Mechanical pre-desolvation method, in order to save steam, sometimes use mechanical extrusion to extrude part of the solvent first, and then perform thermal desolvation and baking. The main equipments for dissolving roasted meal include multi-stage horizontal dryer, high layer drying and steam cooler.