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Corn oil extraction production line
Date: 2020-12-06
Corn oil extraction production line

Process description of corn oil extraction production line.
Corn oil extraction generally has two technological methods, one is physical pressing method, the other is chemical solvent extraction method.

First understand, the introduction of corn (germ) oil:

The fat content of corn germ is between 0.17 and 0.45, which accounts for more than 0.8 of the total fat content of corn. Corn oil is also called corn oil and corn germ oil. It is a vegetable oil extracted from corn germ, mainly composed of unsaturated fatty acids, with a content of 0.8-0.8, 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 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 treating atherosclerosis and other cardiovascular diseases. Corn oil sitosterol has the effect of lowering cholesterol. Corn oil is also rich in vitamin E, which can prevent dry eye, night blindness, dermatitis, bronchiectasis and other functions, and has a certain anti-cancer effect.

In European and American countries, corn oil is widely consumed as a high-end edible oil, enjoying the reputation of "healthy oil", "safe oil" and "longevity oil".

In recent years, with the development of corn deep processing industries such as starch, starch sugar, alcohol, and corn syrup, a large amount of corn germ extracted is used in the oil processing industry. Corn germ oil has developed rapidly in the international market and has become the world’s main edible vegetable oil variety one.

There are two methods for the process of the corn oil extraction production line. One is that the corn processing plant separates and extracts the corn germ from the corn, and the corn germ oil is obtained by extrusion; the other is that the alcohol processing enterprise uses the distiller's grain leaching method to produce oil.

In the oil industry, the process of extracting oil from corn germ after corn peeling is typical.

The preparation of corn germ oil generally includes corn extraction, corn germ extrusion pretreatment, leaching and crude oil refining. The quality of the production process in each process will directly affect the output and quality of the product.

After degermation, corn germ contains a lot of starch and seed coat impurities. Starch impurities have a great influence on the germ oil yield. The starch in the germ reduces the oil flow area during the squeezing and leaching process, blocks the oil passage, absorbs oil during the cooking, squeezing, and desolventizing processes, reduces the oil yield, and gelatinizes Coking affects the quality of refined oil and meal. Wet embryos prepared by wet separation can easily promote the activation of lipolytic enzymes to decompose oils, causing oil rancidity, high acid value, dim color, poor oil quality, and increased refining losses.

According to the characteristics of corn germ obtained by different extraction methods, the corn oil extractor was designed adaptively. Pretreatment pressing, leaching, physical refining and other processes are used to process corn oil that meets national first-level standards at the lowest cost.

Corn germination complete equipment:

At present, most corn germs in the domestic alcohol industry use dry or semi-dry methods, while the starch industry generally uses wet embryo extraction.

The semi-dry embryo extraction process is as follows:

Process Description:

The corn is first transported to a vibrating screen to remove impurities, and then through a magnetic separator and a specific gravity stone remover to remove metal impurities and stones. After cleaning, the impurity content in the blank is less than 0.5%.

After cleaning, treat the corn with water and add hot water or direct steam. The cleaned corn is subjected to steam treatment to make the corn husk and germ absorb water and expand, forming a gap between the kernel and the kernel, facilitating the separation of the husk, germ and endosperm.

The wet corn is crushed with a grinder. The moist germ has excellent elasticity and toughness and is not easily broken. The endosperm is broken into 4-6 petals.

Then a flat rotating screen is used to separate the residue and the corn husk, and then a gravity separator is used to separate the embryo and endosperm. Then roll the embryo with a rolling machine, flatten the embryo, crush the endosperm, and then separate the flake embryos through a flat rotating sieve.

Main equipment of corn oil press:

Vibrating screen, magnetic separator, specific gravity stone remover, hydraulic machinery, crusher, plane rotating screen, gravity separator, edge press, etc.

Corn germ pretreatment and pressing equipment:

The starch content in corn germ is higher. In the oil production process, due to the existence of seed coat (the main component is starch), it will affect the yield and quality of oil. Therefore, the pressing part must be cleaned, and the endosperm and the peel must be separated as much as possible.

The starch contained in the germ is easy to gelatinize when the material temperature is high. Therefore, the cooking temperature and moisture requirements are different for the embryos of different purity during the cooking process. The purity of the embryos is low. Due to the higher starch content, the raw material temperature should be lowered. For high-purity billets, the cooking temperature increases as the purity of the billets increases, and the squeezed water content decreases accordingly.

The press usually uses a screw press. In order to ensure a high oil yield, the pressure of the press must be increased. Small oil mills generally do not support leaching workshops. The squeezers use twin-screw presses to control the residual oil in the pressed cake below 0.6. Large-capacity oil press plants can appropriately reduce the pressing pressure and increase the remaining oil to be leached in the leaching workshop.

Due to the low moisture content of pressed cakes, for the pressed cakes that are sold directly without being leached, the moisture content should be adjusted to about 0.12 for safety reasons.

Process flow of corn oil press:
Corn germ screening, winnowing, softening, embossing, steaming, frying, pressing, filtering crude oil
Process Description:
First, the corn germ is screened or air separated, and the seed coat in the raw material is removed as much as possible to ensure the purity of the raw material, and then the magnetic metal debris is removed by magnetic separation to protect the subsequent mechanical equipment.
The cleaned germ enters the softening equipment to adjust the moisture and temperature of the germ to reduce its toughness, and then pass through the embryo crusher to break the embryo, destroy the cell wall, and facilitate oil production.
After being rolled, the corn germ enters the steamer and frying pan for steaming and frying, so that the protein is fully denatured and solidified, the oil droplets are gathered, and the viscosity is reduced. After heat treatment, adjust the material to a moderate humidity to facilitate extrusion. Control the difference in purity.
The steamed corn germ flakes enter the screw oil press for extrusion. The squeezed oil is transported to the oil tank by the oil residue conveyor, and then sent to the squeeze oil tank for storage after being filtered by the filter. The oil residue is installed in the oil tank, and the machine can realize the pressing of the oil residue. The pressed cake is transported to the cake store by the conveyor, and then leached or stored in the cake store by the extraction workshop.
For safety reasons, the moisture content of pressed cakes sold directly without the extraction workshop should be adjusted to about 12%

Complete sets of equipment for corn oil extraction production line:

Although the leaching process of corn germ is similar to that of soybean and rapeseed, corn germ contains more powder and a lot of ungelatinized starch, which will greatly affect the leaching effect, and also reduce the quality of leached crude oil and increase refining. The process is difficult, easily causes equipment scaling and pipeline blockage, reduces the heat transfer efficiency of the evaporation and condensation system, and causes flooding of the evaporation system. Due to the high volume density of corn germ and high content of viscous substances, it will also affect the solubility of the leached wet meal, thereby affecting the steam removal effect. Therefore, in the design and installation of the extraction plant, the material properties of corn germ determine its own characteristics.

1 The powder density of corn germ raw materials is controlled within 5% of the 100-mesh sieve to avoid clogging the bottom of the sieve due to excessive solvent absorption, hindering the seepage of the mixed oil and affecting the solvent penetration effect.

2 Due to the low extraction rate of corn germ, the extraction time should be longer. Therefore, the extractor appropriately extends the length of the filtering and drying section, prolongs the drainage time, and is specially designed for spraying.

three. In particular, an oil mixing hopper flushing device is added to flush the residual bacterial powder in the oil mixing hopper in time to avoid accumulation of bacterial powder in the oil mixing hopper, which affects subsequent production and brings difficulties to maintenance and cleaning.

4 Add a filter to clean the mixed oil in multiple stages to ensure that the evaporation system is not polluted.

5 During the dissolution process, the design of the steam dissolver fully considers the material characteristics of high solubility of corn germ wet meal, appropriately improves the pre-stripping ability of the pre-stripping layer of the steam stripper, and strengthens the effect of the dissolving layer.

6 In view of the high solvent extraction of corn germ and low mixed oil concentration, the evaporation area should be appropriately increased. The negative pressure evaporation process is adopted to reduce the evaporation temperature of 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 production line:

Corn germ pressed cake extraction filtration evaporation steam stripping crude oil extraction

Process Description:

The corn germ pressed cake in the pre-pressing workshop is transported to the extraction workshop, and then enters the extractor through the 1# buried scraper conveyor and sealed twister. With the operation of the extractor, the mixed oil with decreasing concentration is injected, and finally fresh solvent is injected. The oil content of the feed material is reduced to less than 1%, and the wet material is sent to the stripper via a 2-layer buried scraper conveyor and a sealed screw conveyor, sprayed with direct steam to remove the solvent, and transported to the silo for packaging. The mixed oil obtained by leaching grease with a solvent is filtered, mechanical impurity precipitation, evaporation, steam stripping and other processes 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 primary steam, secondary steam and stripping work under vacuum conditions, which reduces the evaporation temperature, improves the quality of crude oil, and saves steam consumption.

The solvent vapors of desteaming, first steaming, second steaming, steam stripping and leaching are respectively recovered by the corresponding condensers, and the condensate is concentrated into the liquid collecting tank, and after entering the integrated container to separate the water, it is then pumped into the extractor 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, the tail gas is recovered and emptied of solvent.

Extraction workshop evaporator

Main equipment of corn oil extraction production line:

Extractor, special steamer for corn germ, food divider, long tube evaporator, inclined plate stripper, condenser, integrated container, cooking tank, exhaust gas absorption tower, etc.

Main features of corn oil press:

This equipment is specially designed for corn germ leaching, adopting negative pressure evaporation process, low residual oil, low solubility, good quality and light color.
Complete set of refining equipment for corn oil press:

Crude corn oil is a deep red amber vegetable oil, obtained by squeezing or leaching corn germ. Crude corn oil contains phospholipids, sterols, tocopherols, fatty acids, waxes and other unsaponifiables. There is also a special smell corn crude oil contains high impurities. It is turbid at low temperatures and cannot be used directly. After being refined, corn refined oil with low cloud point, low melting point and stable storage meeting national standards can be obtained.

Complete set of refining equipment for corn oil extraction production line:

Wool corn oil is a deep red amber vegetable oil, obtained by squeezing or leaching corn germ. The crude corn oil contains phospholipids, sterols, tocopherols, fatty acids, waxes and other unsaponifiables. There is also a special smell corn crude oil is high in impurities. It is turbid at low temperatures and cannot be used directly. After being refined, corn refined oil with low cloud point, low melting point and stable storage meeting national standards can be obtained.

The machine refining process of corn oil:

Crude oil degumming, decolorization, filtration, deoxygenation, heat exchange, heating, deacidification, deodorization, heat exchange, cooling, crystal growth, filtered product oil

Refining process description of corn oil extraction production line:

After the crude oil is preheated, add light base to form soapstock in the oil and some free fatty acids in the oil, then separate the soapstock, and then add hot salt water to the oil for washing, separate soapy water, and after degumming once and twice , The same washing is completed. The degummed oil enters the decolorization process, where activated clay is added to the decolorization tower for decolorization, and then pumped into the leaf filter for filtration. After polishing, the filtrate enters the next process. After being blow-dried by the blades, the garbage is drained through a vibrating screen. The decolorized oil is vacuum deoxygenated by the air pump, then pumped into the oil-oil heat exchanger and deodorized oil for heat exchange preheating, and then enters the heater to heat to about 250°C, and enters deacidification and deodorization under high vacuum Combined tower, in the process of deacidification and deodorization, the volatile substances and peculiar smells such as fatty acids in the grease are removed to the maximum. The fatty acid mixed steam is discharged from the top of the tower and is captured and sold by the fatty acid capture system. The oil is drawn from the bottom, pumped into the heat exchanger to exchange heat with the oil to be deodorized, and deodorized oil is obtained after cooling. The deodorized oil enters the crystallization stage after cooling and crystallization in the crystallization tank. The crystal oil is pumped into the filter to separate wax and fat to obtain refined oil.
 Batch refining production line

Model YMY10---YMY 1000
Output 10 tons---100O tons/day
Voltage -380V--440V

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