Solvent extraction is a process to extract oil from oil bearing materials by means of solvent, and the typical solvent is hexane. The vegetable oil extraction plant is part of vegetable oil processing plant which is designed to extract oil directly from oil seeds containing less than 20% oil, like soybeans, after flaking. Or it extracts oil from pre-pressed or fully pressed cake of seeds containing more than 20% oil, like sunflowers, peanuts, cotton seed and a variety of other materials.

Main machines

Tube condenser, oil stripper, solvent evaporator, desolventizer toaster, loop type Oil extractor, rotary or rotocel extractor, oil tank, etc.

Technology of the oil extraction plant

1.Absorbing the world’s leading core extraction technology, design and develop a process which is efficient, economical and reliable. Adopting box-chained loop type extractor can effectively achieve low residual oil, low solvent consumption and low failure rate of equipment. Thus, customers will have little cost and investment, and profit maximization will be achieved.

2.Full automatic computer control system is adopted in extracting process, adjust automatically and operate stably.

3.Negative pressure technology is adopted in condensate system. Using the secondary steam which comes from the DTDC as the heat source of first evaporation, thus can maximum save the energy consumption.

4.Stainless steel heat exchange tubes and multi-stage baffling make the condenser have a high heat transfer efficiency, also the water consumption is low.

5.Composed of pre-extraction, extraction and draining sections. There is material turnover in the process of extraction to make the extraction uniform and thorough. Special self-cell solvent spraying ensures the best effect during extraction.

Processing raw material

The flow chart of oil extraction plant

Process details of the oil extraction plant:

1. Solvent extractor

The extractor is the apparatus within the solvent extraction process in which the vegetable oil fraction of the oleaginous material is separated from the meal fraction of the oleaginous material by dissolving the oil fraction in a Solvent.

2. Meal desolventiser toaster

After the prepared material has had its oil extracted in the solvent extractor, it is conveyed to the meal desolventiser toaster, commonly referred to as the DT. The primary purpose of the DT is to remove the solvent from the meal fraction so that the solvent can be recovered.  The DT has three different types of tray: predesolventising trays, countercurrent trays and a sparge tray.

Meal dryer cooler

After the solvent-laden material is desolventised, it is conveyed to the DC. The primary purposes of the DC are to reduce the moisture in the meal to within trading rule limits and to lower the meal temperature prior to storage. The DC has three different types of tray: steam-drying trays, air-drying trays and air-cooling Trays.

3. Miscella distillation system

The miscella exiting the extractor contains up to 1% by weight particles of meal. Therefore, the first step in miscella distillation is meal particle separation. Meal particles can be separated from the miscella by filtration or centrifugal separation.

Then the miscella is pumped from the full miscella tank to the first of two rising film evaporators. The first-stage evaporator, often referred to as the economiser, utilises the waste heat from the DT as its heating source. After preheating and concentrating, the miscella is pumped into the second-stage evaporator, which utilises low-pressure steam as its heating source.

Miscella from the second-stage evaporator is pumped or gravity-fed into the oil stripper. The oil typically exits the base of the oil stripper with 0.1–0.3% moisture and 5–200 ppm solvent, at a temperature of approximately 95–110 ℃.

Then oil leaving the oil stripper, and it is typically pumped to an oil dryer. The oil typically exits the base of the oil dryer with 0.05–0.10% moisture and 5–100 ppm solvent, at a temperature of approximately 105 ℃.

After drying, the dried oil must have its temperature reduced from 105 to 50 ℃ in order to prevent degradation in storage and transport. After cooling, the cool oil is then pumped to storage.

4. Solvent recovery system

The solvent recovery system includes solvent and water vapour condensation, solvent–water separation, stripping of solvent from water and air effluent streams and heating of the solvent prior to reuse in the Extractor.

1. Simple in structure with stable performance;

2. Evaporation takes place in a vacuum for the best oil quality.

3. Extraction system can process different raw materials.

4. High efficient solvent recovery system.

5. With full energy conservation and repeat utilization, steam consumption is markedly reduced.

6. Composed of pre-extraction, extraction and draining sections.

 Zhengzhou New Lead Grain and Oil Science and Technology Co., Ltd. 

Advantages:

1. Specializing in edible oil processing plants and its machines, like oil pre-treatment plant, oil solvent extraction plant and oil refinery plant.

2. Providing you first-class technology and service to ensure the project being completed smoothly.

3. Over 150 personnel, professionals take up more than 30%.

4. Passing the quality management system certification of ISO9001-2000.

5. Offering tailor-made turnkey solutions to the client's right from designing and erection to commissioning and maintenance.

Business Scope

10-2000t/d vegetable oil pre-pressing and extraction plant;

10-600t/d vegetable oil refinery plant;

10-300t/d animal oil refinery plant;

50-500t/d aroma peanut oil production line;

3000-10000t/y soybean protein isolates production line;

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.

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!