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Pretreatment Section in oil processing plant
In the oil mill plant, before the extrusion of oil from oil seeds, an oil pretreatment process is typically undertaken to improve the efficiency of production and to ultimately save on costs.
In the oil processing plant, the pretreatment process typically involves working procedures of removing impurities from oil materials.
These impurities include the following items:
1. Organic impurities, such as stems and leaves, cord and chemical fibers.
2. Inorganic impurities such as soil and metal.
The Goal of the pretreatment section
1.Improve the quality of the oil and the cake.
2.Increase rate of productivity and reduce residual oil.
3.Increase the capabilities of the equipment.
4.Lessens wear and lengthens the life of the equipment.
5.Ensure safety.
Flow chart of the pretreatment process
Process details:
1. Dehulling process
Cleaned cottonseeds are crushed into 1/4-1/6 pieces in the toothed roll decorticator (two pair). Then oilseeds are squeezed strongly by the relative rotation of the two fluted rollers with different linear velocity. Moreover, the alveolus can split and cut the hulls of oilseeds. Thus the dehulling effect will be achieved.
2. Kernel husk separation
The product of cottonseeds after husking is a kind of mixture, which includes complete oilseeds, kernel and husk. And the mixture must be seperated. Kernel and husk are separated by the combined adoption of cottonseeds kernel husk separator and double drum hull beater. After husking cottonseeds enter into kernel husk separator, under the beating of the hull beater, cottonseeds enter into rotary vibrating separator to remove the husk in kernel again. And the upper hull enters into the double drum hull beater, seperating the cottonseeds kernel in hull, to ensure that the rate of kernel in hull is less than 0.5%. Kernel husk seperation will effectively seperate the mixture into kernel and hull. Kernel is sent into flaking process and cottonseeds hull is conveyed into warehouse or packed and stacked.
3. Kernel and hull adjustment
The separated cottonseeds kernel are conveyed into the kernel and hull adjustment screen through the conveyer scraper, because the higher hull content in the kernel is, the lower protein content in the finished cotton meal is. Due to the need of cotton meal with different protein content in the market, the process is mainly to adjust the hull content in cottonseeds kernel and process cotton meal with different protein content.
4.Flaking
The main purpose of flaking is to destroy cell wall within cottonseed
kernel so that oil within cottonseed kernel can be extracted out.After the process of flaking, the thickness of material will be reduced and its surfacearea will be increased, which are in favor of moisture penetration and heattransfer towards the inside of particle in the cooking process.
5. Cooking
After wetting, heating, steaming, frying and other processing, the raw embryos come up complicated physical chemistry change in its interior and become mature embryos. Thus creating a better condition to extract the oil, the heat treatment process is called cooking.
Cooking can accelerate the rupture of the color glands. The higher the moisture of embryos is, the more thorough the destruction of the color glands will be, and the free gossypol can spill out easily. As the cooking and frying temperature rises, a large number of free gossypol can bind with proteins. If there is a shortage of water when cooking, the produced combined gossypol may become denatured gossypol and dissolve in oil. If high moisture cooking is adopted, the phospholipids absorb water firstly and then condensed. Thus the chance of the formation of phospholipid and gossypol mixture can be reduced, meanwhile, the chance of the formation of denatured gossypol is reduced.
6.Pressing process
Embryos after cooking are called cooked flakes,crude oil containing slagsfrom presser is pressed into oil settling
tank through oil scraper blade, after the slag is removed, the crude oil is sent into oil filter tank,and then it is sent
into horizontal screw centrifuge for purification. Pre-pressed cake from oil presser is conveyed into extraction plant by cake collecting scraper and cake scraper, and then enters into the following process.
1.Warm hulling process reduces energy consumption.
2.Double cracking and hulling process improves the hulling ratio and reduce oil residue in the hull.
3.High volume hull bin makes production flexible.
4.Makes it possible to produce meals of various protein content (includes meal milling).
5.Adopts the complete explosion puffing process.
6.Automated controls.
Power consumption |
≤32.5 kw/t cottonseeds |
Steam consumption |
≤150Kg/t cottonseeds |
Pre-pressed cake thickness |
≤17mm |
Pre-pressed cake moisture |
≤4-6% |
Pre-pressed cake oiliness |
≤14-16% |
Rate of kernel in hull |
≤0.5% |
Zhengzhou New Lead Grain and Oil Science and Technology Co., Ltd.
Company Profile
Brief Introduction
Zhengzhou New Lead Grain & Oil Science and Technology Co., Ltd. is an industrial company focusing on processing of grain and oil food, research and development of new technology, production of mechanical equipment, installation and adjustment of complete engineering and training service.
Now the company has 158 personnel, of which the professionals take up more than 30%. And it has owned the second level qualification of state electromechanical engineering and has passed the quality management system certification of ISO9001-2000. It is already a research and development typed engineering company that combines scientific research, manufacturing and development.
Business Scope
10-2000t/d production line of oil seeds pre-pressing and extraction;
10-600t/d production line of refining;
10-300t/d production line of animal oil refining;
Production line of miscella refining;
50-500t/d production line of white soybean flake;
50-500t/d production line of aroma peanut oil;
3000-10000t/y production line of soybean protein isolates;
10000-30000t/y production line of soybean protein concentrate, textured protein;
Production line of oil dewaxing, fractionation and winterization;
Production line of glycerin and fatty acid;
Production line of biology diesel oil.
Constructed Projects
Oil pretreatment, pressing and extracting plant
Oil refining plant
Oil storage tank and small packaging engineering
Service Promise
Zhengzhou New Lead Grain & Oil Science and Technology Co., Ltd has always put the interests of customers first, insists on providing a customerized and comprehensive service, including on-site service and after-sale service. Now the specific commitments are as follows:
1. Ensure providing complete equipment and its accessories on time.
2. Ensure the installation and adjustment are once accepted.
3. Ensure providing high-quality equipments with competitive price.
4. Providing new products and advanced technology preferentially;
5.Providing the operating technicians professional training to ensure operate independently.
6. Appointing you a inspector during the installation process.
7. Arranging an professional installation team which will be managed by our PM.
8. We will be in charge of single machine commissioning, online debugging and feeding trial running to ensure that the machine can operate normally under the condition of full load. The company will provide you all kinds of relevant information and records according to the bidding document. Within one month after the acceptance, we will provide you qualified as-built documents as your request.
9. Within the warranty period, we repair equipments that has quality issues freely as well as free parts.
The company offers tailor-made turnkey solutions to the client’s right from designing and erection to commissioning and maintenance.
We will provide the owner first-class technology and service to ensure the project being completed smoothly.
If you are interested in our products or have any questions, please do not hesitate to contact us! We are always at your service!
Contact Information
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