When small and medium-sized oil mills choose processing technologies for rapeseeds, peanuts, or cottonseeds, they often face the dilemma of deciding between 'secondary pressing' and 'single solvent extraction'. This article delves deep into the technical differences, cost structures, and applicable scenarios of these two processes. It focuses on analyzing the role and adaptability of the ZY24 (202 - 3) screw oil press, a core device for continuous pressing, in different process chains - from residual oil content, energy consumption to refining difficulty. Real - life cases are presented to illustrate how to scientifically select the appropriate machine based on production scale and raw material characteristics, helping users efficiently plan their production lines and enhance overall profitability.
To make an informed decision, it is essential to compare the technical parameters of secondary pressing and solvent extraction. Here is a table summarizing the key differences:
| Parameter | Secondary Pressing | Single Solvent Extraction |
|---|---|---|
| Residual Oil Content | Typically around 5% - 8% | Can be as low as 1% - 2% |
| Energy Consumption | Relatively high, about 15 - 20 kWh per ton of raw material | Lower, around 8 - 12 kWh per ton of raw material |
| Investment Threshold | Lower initial investment, mainly for the oil press and related equipment | Higher initial investment, including solvent extraction equipment and safety facilities |
As shown in the table, secondary pressing generally has a higher residual oil content and energy consumption but a lower investment threshold. On the other hand, single solvent extraction can achieve a lower residual oil content with lower energy consumption, but it requires a higher initial investment. Learn more about the technical parameter differences between the two processes.
Different oilseeds have different characteristics, which affect the choice of processing technology. Let's take cottonseeds and peanuts as examples:
Cottonseeds have a relatively high fiber content and a hard shell. Secondary pressing can effectively break the shell and extract a large amount of oil. However, due to the high fiber content, the residual oil content after secondary pressing may still be relatively high. For peanuts, which have a high oil content and a relatively soft texture, single solvent extraction can achieve a very low residual oil content. But if the scale of production is small, the high investment in solvent extraction equipment may not be cost - effective.
In general, for oilseeds with high fiber content or hard shells, secondary pressing may be a better choice. For oilseeds with high oil content and soft texture, single solvent extraction may be more suitable. Discover more about the adaptability of different oilseeds to the two processes.
The ZY24 (202 - 3) screw oil press plays a crucial role in both secondary pressing and solvent extraction processes. In the secondary pressing process, it can perform the first - stage pressing, reducing the oil content in the raw material to a certain extent. Then, the semi - pressed material can be further processed in the second - stage pressing to extract more oil. In the solvent extraction process, the screw oil press can also be used for pre - pressing, reducing the workload of the solvent extraction equipment and improving the overall efficiency.
The performance of the screw oil press, such as its ability to control residual oil content, energy consumption, and refining difficulty, directly affects the quality and cost of the final oil product. Understand more about the role of the ZY24 (202 - 3) screw oil press in different processes.
To enhance the practicality of this article, we have collected some common questions from users and real - life customer cases.
Answer: For small - scale production (less than 10 tons per day), secondary pressing is usually a better choice due to its lower investment threshold. For medium - scale production (10 - 50 tons per day), both options can be considered depending on the raw material characteristics. For large - scale production (more than 50 tons per day), single solvent extraction may be more cost - effective in the long run.
A small - sized oil mill mainly processes rapeseeds. Initially, they used single solvent extraction, but due to the high investment in equipment and operation costs, they switched to secondary pressing. After using the ZY24 (202 - 3) screw oil press, they were able to improve the oil extraction rate and reduce the production cost. Explore more practical Q&A and customer cases.
Based on the above analysis, small and medium - sized oil mills should make a rational decision according to their own production scale, raw material characteristics, and financial situation. If you are still unsure which process to choose, you can visit our product detail page or download our tool kit for more in - depth guidance. Our experts are also ready to provide you with personalized advice to help you optimize your production line and increase your overall revenue.
