Solvent extraction is a widely - used method for extracting sunflower oil. The core of this technology lies in the hexane extraction principle. Hexane, as a common solvent, has a strong ability to dissolve oil. When it comes into contact with sunflower seeds, it can effectively extract the oil from the seeds. The equipment design for this process is also crucial. The extraction equipment is usually composed of multiple parts, including the extraction tank, separation device, and solvent recovery system. The well - designed equipment structure can ensure the smooth progress of the extraction process.
The whole process of solvent extraction for sunflower oil starts with the pretreatment of sunflower seeds. The seeds need to be cleaned and crushed appropriately. Then, they are sent to the extraction tank, where they are mixed with hexane. After a certain period of extraction, the oil - containing solvent is separated from the solid residue. Subsequently, the solvent is removed from the oil through the desolvation process, leaving pure sunflower oil.
The oil content and particle size distribution of sunflower seeds have a significant impact on the oil extraction efficiency. Generally, sunflower seeds with a higher oil content can achieve a higher oil yield. And the appropriate particle size can increase the contact area between the seeds and the solvent, thereby improving the extraction efficiency. Through data analysis, it is found that when the particle size of sunflower seeds is between 0.5 - 1mm and the oil content is above 40%, the extraction efficiency can reach more than 90%.
| Particle Size (mm) | Oil Content (%) | Extraction Efficiency (%) |
|---|---|---|
| 0.2 - 0.5 | 35 - 40 | 80 - 85 |
| 0.5 - 1 | 40 - 45 | 90 - 95 |
| 1 - 1.5 | 30 - 35 | 75 - 80 |
Based on these data, the process optimization direction is clear. By adjusting the pretreatment process of sunflower seeds, such as controlling the crushing degree, the extraction efficiency can be further improved. At the same time, optimizing the extraction time and temperature can also contribute to better results.
The desolvation process is a key step in the solvent extraction of sunflower oil. It is necessary to control the temperature and pressure precisely to ensure that the solvent can be completely removed from the oil. Generally, the desolvation temperature is controlled at about 100 - 120°C, and the pressure is maintained at a relatively low level.
In terms of safety measures, since hexane is a flammable and explosive solvent, strict safety operation specifications must be followed. The extraction workshop should be equipped with good ventilation facilities to prevent the accumulation of hexane vapor. Workers need to wear appropriate protective equipment, such as gas masks and anti - static clothing. Regular safety inspections should also be carried out to ensure the safety of the production process.
Many large - scale grain and oil processing enterprises have adopted the solvent extraction method for sunflower oil production. For example, Company A, a well - known grain and oil enterprise, has achieved remarkable results after using this technology. Before using the solvent extraction method, the oil yield of Company A was about 80%, and the energy consumption was relatively high. After the application of this technology, the oil yield increased to more than 90%, and the energy consumption was reduced by about 30%. At the same time, the labor cost was also significantly reduced, and the market competitiveness was enhanced.
In conclusion, the solvent extraction method for sunflower oil has many advantages, such as high oil yield, low energy consumption, and strong market competitiveness. If you are a large - scale grain and oil processing enterprise looking for a more efficient and environmentally friendly sunflower oil extraction solution, our sunflower oil extraction machinery can provide you with the perfect answer. Click here to learn more about our sunflower oil extraction equipment!
