Corn oil extraction machine
Corn oil extraction machine
Corn oil extraction machine process
Introduction of corn (germ) oil:
The content of corn germ fat is between 0.17 and 0.45, accounting for about 0.8 or more of the total corn fat content. Corn oil is also called corn oil and corn germ oil. It is a vegetable oil extracted from corn germ, which is mainly composed of unsaturated fatty acids, and its content is as high as 0.8 to 0.8, of which oleic acid accounts for 0.3% to 48%, and linoleic acid accounts for 34. %0.56, linoleic acid is an essential fatty acid for the human body and is a component of human cells. It can be combined with cholesterol in the human body, showing fluidity and normal metabolism. It has the effect of preventing and curing cardiovascular diseases such as atherosclerosis. Corn oil Sitosterol has the effect of lowering cholesterol. Corn oil is also rich in vitamin E, which can prevent various functions such as dry eye disease, night blindness, dermatitis, bronchiectasis, and has certain anti-cancer effects.
In European and American countries, corn oil is widely consumed as a high-grade edible oil, and enjoys the reputation of "healthy oil", "rest assured oil" and "longevity oil".
In recent years, with the development of corn deep processing industries such as starch, starch sugar, and alcohol, corn germ oil has grown rapidly in the international market and has become one of the world's major edible vegetable oil varieties.
The process of corn germ oil extraction machine has two ways: one is the corn processing plant to separate and extract the germ from the corn, and the corn corn germ oil is obtained by squeezing and leaching, and the other is that the alcohol processing enterprises use the lees leaching method to produce oil.
In the oil and fat industry, after degerming corn, the process of extracting oil from corn germ is typical.
The preparation of corn germ oil generally includes corn extraction, pretreatment of corn germ squeezing, leaching, and refining of crude oil. The quality of production technology in each process will directly affect the yield and quality of the product.
The dry germ-removed corn germ contains a lot of starch and seed coat impurities. The starch impurities will greatly affect the oil yield of the germ, and the starch in the germ reduces the oil flow area during the pressing and leaching process, blocks the oil passage, and absorbs Grease, reduce oil yield, gelatinization and coking in the process of steaming, squeezing, desolvation, affecting the quality of refined oil and meal. The wet germ prepared by wet separation is easy to promote the activation of lipolytic enzymes to decompose oil, causing oil rancidity, acid value height, dull color, poor oil quality, and increased refining loss.
The corn oil extraction machine is adaptively designed according to the characteristics of the corn germ obtained by different embryo extraction methods. It uses pretreatment pressing, leaching, physical refining and other processes to process corn oil that meets the national first-class standards at the lowest cost.
Complete equipment for corn germination:
At present, most of the domestic alcohol industry corn corn embryos adopt dry method or semi-dry method, while wet embryo extraction is widely used in starch industry.
Semi-dry embryo extraction process is as follows:
Corn—clean up—run water—crush—screen—suck air separation—gravity classification—roll embryo—screen—embryo
Corn is first transported to the vibration cleaning screen to remove impurities, and then the metal impurities and stones are removed through the magnetic separator and the specific gravity stone removal machine. After cleaning, the impurity content in the blank is less than 0.5%.
After cleaning, the corn is treated with water and added with hot water or direct steam. The cleaned corn is subjected to water vapor treatment to make the corn hull and germ absorb water and expand, and a gap is formed between the kernel and the kernel to facilitate the separation of the hull, germ and endosperm.
The moistened corn is crushed with a crusher. The moistened germ is particularly good in elasticity and toughness, which is not easy to break, and the endosperm is broken into 4-6 petals.
Then use a plane rotary sieve to separate the slag and corn hulls, and then separate the embryo and endosperm with a gravity separator. Then, the embryo is rolled with a embryo rolling machine, the embryo is squashed, and the endosperm is crushed, and then the flake embryo is separated through a plane rotary sieve.
Main equipment of corn oil extraction machine:
Vibration cleaning screen, magnetic separator, specific gravity stone removal machine, water machine, crusher, plane rotary screen, gravity separator, blank rolling machine, etc.
Corn germ pretreatment and pressing equipment:
The content of starch in corn germ is high. Because of the presence of seed coat (the main component is starch) in the oil production process, it will affect the oil yield and oil quality. Therefore, the press section must pay great attention to cleaning, and the endosperm and skin should be separated as much as possible. .
The starch contained in the germ is easy to gelatinize when the material temperature is high, so the steaming process for the different purity of the embryo material, the steaming temperature and moisture requirements are also different, the low purity of the embryo material, due to the higher starch content, the material temperature Should be reduced, high-purity embryo material, the steaming temperature increases with the increase of the purity of the embryo material, and the water content of the squeezing is reduced accordingly.
The press generally uses a screw press. In order to ensure a high oil yield, the pressure of the press must be increased. For small-scale press oil plants, the leaching workshop is generally not supported, and the press uses a double screw press Machine, the residual oil of the press cake is controlled below 0.6, and the large-capacity press oil factory can appropriately reduce the pressure of the press and increase the residual oil to be leached in the leaching workshop.
Due to the low water content in the press cake, for the press cake sold directly without leaching, for safety reasons, the moisture should be appropriately adjusted to about 0.12.
Process flow of corn oil extraction machine:
Corn germ-screening-winnowing-softening-rolling embryo-steaming and frying-pressing-fishing residue-filtering-crude oil
The corn germ is firstly screened or air-separated to remove the seed coat from the raw materials as much as possible to ensure the purity of the material, and then the magnetic metal debris is removed by magnetic separation to protect the subsequent machinery and equipment.
The cleaned germ enters the softening equipment, adjusts the moisture and temperature of the germ, reduces its toughness, and then passes through the embryo rolling machine to break the embryo to destroy the cell wall and facilitate oil production.
After being rolled, the corn germ enters the steaming and frying pan for steaming and frying, so that the protein is fully denatured and solidified, the oil droplets are aggregated, and the viscosity is reduced. After the heat treatment, the material is adjusted to moderate moisture to facilitate squeezing. Control the difference in purity.
The steamed corn germ embryo chips enter the spiral oil press for squeezing. The squeezed oil is transferred to the oil tank through the oil residue conveyor, and then filtered by the filter, and then sent to the squeeze oil tank for storage. The oil residue is installed in the oil tank The machine can realize the repressing of the oil residue, and the pressed cake is transported to the cake store through the conveyor to the leaching workshop for leaching or cake store to store.
For safety reasons, for press cakes that are sold directly without entering the leaching workshop, the moisture should be adjusted to about 12%.
Complete set of equipment for extraction of corn oil extraction machine:
Although the corn germ leaching process is similar to the soybean and rapeseed leaching process, the corn germ contains more powder and a large amount of ungelatinized starch, which will greatly affect the leaching effect, and will also reduce the quality of leaching crude oil and increase refining. It is difficult, and it is easy to foul equipment and block pipes, reduce the heat transfer efficiency of the evaporation and condensation systems, and cause the flooding of the evaporation system. Because the bulk density of corn germ is large and the content of sticky substances is high, it will also affect the solubility of the leached wet meal, so it will affect the effect of steam removal. Therefore, the material characteristics of corn germ determine its own characteristics in the design and installation of the leaching workshop.
1. The powder density of the raw material of corn germ is controlled within 5% of the 100 mesh sieve, to avoid blocking the bottom of the sieve due to excessive powder absorption of the solvent, hindering the percolation of the mixed oil, and affecting the solvent penetration effect.
2. Due to the relatively low leaching rate of corn germ, the leaching time should be relatively long. Therefore, the leacher appropriately lengthened the length of the filter drying section, extended the draining time, and specially designed the spraying method.
3. In particular, a mixing oil hopper flushing device is added to flush the germ powder remaining in the mixing oil hopper in time to avoid accumulation in the mixing oil hopper, which affects subsequent production and causes difficulties in maintenance and cleaning.
4. Add filters to perform multi-stage cleaning of the mixed oil to ensure that the evaporation system is not contaminated.
5. The design of the steam dissolving machine in the dissolving process fully takes into account the characteristics of the material with high solubility of corn germ wet meal, and appropriately enhances the pre-striping capacity of the pre-strip layer of the steam stripping machine and strengthens the effect of dissolving layer.
6. In view of the characteristics that the leaching solvent of corn germ material is relatively high and the concentration of mixed oil is low, the evaporation area should be appropriately increased. The negative pressure evaporation process is used to reduce the evaporation temperature of the mixed oil, minimize starch gelatinization and protein denaturation caused by high temperature, and improve the quality of crude oil.
Process flow of corn oil extraction machine:
Corn germ press cake → leaching → filtering → evaporation → steam stripping → leaching crude oil
The corn germ press cake in the pre-press workshop is transported to the leaching workshop, enters the leacher through the 1# buried scraper conveyor and the sealing twister, and with the operation of the leacher, the mixed oil whose concentration decreases in sequence is injected, and finally the fresh solvent is injected In order to reduce the oil content in the feed to less than 1%, the wet meal is fed into the steam stripper by the 2# buried scraper conveyor and sealed auger, sprayed with direct steam to remove the solvent, and transported to the meal warehouse for packaging. The mixed oil obtained by leaching the oil and fat with the solvent is subjected to processes such as filtration, precipitation of mechanical impurities, evaporation, and steam stripping to remove the solvent to obtain leached crude oil.
The mixed oil adopts negative pressure evaporation technology and uses the secondary steam of the stripper as the heat source. The first steam, second steam and stripping work under vacuum, which reduces the evaporation temperature, improves the quality of the crude oil, and saves the steam consumption. .
The solvent vapors of steam removal, first steaming, second steaming, steam stripping and leaching are respectively recovered by corresponding condensers, the condensate is concentrated into a liquid collecting tank, and after entering the comprehensive container to separate the water, the solvent is then pumped into the leacher to enter the next cycle , The separated water is discharged through the cooking tank and the waste water is discharged. The free gas of each condenser enters the balance tank, and then enters the final condenser, and the tail gas recovers the solvent and is emptied.
Main equipment of corn oil extraction machine:
Leacher, corn germ special steamer, meal trap, long tube evaporator, inclined plate stripping tower, condenser, integrated container, cooking tank, exhaust gas absorption tower, etc.
Main features of corn oil extraction machine:
The equipment is specially designed for corn germ leaching, adopts negative pressure evaporation process, low residual oil, low dissolution, good quality and light color.
Complete refining equipment for corn oil extraction machine:
Wool corn oil is a dark reddish amber vegetable oil obtained by squeezing or leaching corn germ. Wool corn oil contains phospholipids, unsaponifiables such as sterols, tocopherols, fatty acids, waxes, and a special smell The crude corn oil has a high impurity content. It appears turbid at low temperatures and cannot be used directly. After refining, it can obtain a corn refined oil with low cloud point, low melting point and stable storage that meets national standards.
Refining process of corn oil extraction machine:
Crude oil-Degumming-Decoloring-Filtration-Deoxygenation-Heat exchange-Heating-Deacidification and deodorization-Heat exchange-Cooling-Crystallization-Crystal growth-Filtration-Product oil
Description of refining process of corn oil extraction machine:
After the crude oil is preheated, light alkali is added to form soap feet in the oil and some free fatty acids in the oil, and then the soap feet are separated, and then hot salt water is added to the oil for washing, and the soap water is separated, after one and two Degumming is completed after the same washing. The degummed oil enters the decolorization process, adds activated clay to decolorize in the decolorization tower, and then pumps into the blade filter to filter. The filtrate is polished and enters the next process. After the blade filter is blown dry, the waste clay is discharged by vibration. The decolorized oil is pumped into the gas separator for vacuum deoxygenation, then pumped into the oil-oil heat exchanger and deodorized oil for heat exchange preheating, and then enters the heater to be heated to about 250 ℃ into the combined deacidification and deodorization tower in a high vacuum state Under the process of deacidification and deodorization, the volatile substances such as fatty acids and odors in the oil are removed to the maximum extent. The fatty acid mixed steam is discharged from the top of the tower and captured by the fatty acid trapping system for sale. The oil is drawn from the bottom and pumped into the heat exchanger to exchange heat with the oil to be deodorized, and then cooled to obtain deodorized oil. The deodorized oil is cooled and crystallized in a crystallization tank and then transferred to the crystallization stage. The crystalline oil is pumped into a filter to separate wax and fat to obtain refined oil.
Refining equipment parts of corn oil extraction machine:
Centrifuge (or oil refining boiler), decolorization tower, blade filter, bag filter, combined deacidification and deodorization tower, spiral plate heat exchanger, crystallization tank, dewaxing filter, etc.
Characteristics of refining process of corn oil extraction machine:
Using physical refining technology, equipped with advanced combined deacidification and deodorization tower, high degree of automation, low production cost, low loss, designed dewaxing and degreasing process, the quality of refined oil can reach national standards