Small and medium-scale oil mills often face a dilemma when choosing between the 'secondary pressing' and 'single solvent extraction' processes in cottonseed processing. This article analyzes the differences between these two processes in terms of residual oil rate, energy consumption, equipment investment, and refining difficulty through real-world cases. It also delves into the core role of the ZY24 screw oil press in the continuous pressing stage - how it affects the overall process efficiency and output stability. By doing so, it helps you make scientific decisions based on raw material characteristics (such as cottonseed), production scale (e.g., 3 tons per day), and market positioning, avoiding blind investment and enhancing oil product revenue.
Let's take a small oil mill that processes 3 tons of cottonseed per day as an example. The mill's management is struggling to decide which process to adopt. This is a common situation among many small and medium-scale oil mills. The wrong choice can lead to increased costs, lower product quality, and reduced competitiveness in the market.
The following table compares the technical indicators of the secondary pressing and single solvent extraction processes:
| Technical Indicator | Secondary Pressing | Single Solvent Extraction |
|---|---|---|
| Residual Oil Rate | Around 5 - 7% | Around 1 - 2% |
| Energy Consumption | Relatively high, about 100 - 150 kWh per ton | Relatively low, about 50 - 80 kWh per ton |
| Investment Threshold | Lower, mainly for pressing equipment | Higher, including solvent extraction equipment and safety facilities |
| Refining Difficulty | Lower, as the oil has fewer impurities | Higher, due to the presence of solvents and more complex impurities |
Different oilseeds have different characteristics, and thus require different processing methods. For example, cottonseed has a relatively high oil content and a hard shell, while peanuts have a lower oil content and a softer shell. Through actual customer cases, we can see that cottonseed is more suitable for the secondary pressing process in some cases, while peanuts may be better processed using the single solvent extraction process.
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"We used to process peanuts with the secondary pressing process, but the residual oil rate was quite high. After switching to the single solvent extraction process, our oil yield increased significantly, and the quality also improved." - A customer from a peanut oil mill
The ZY24 screw oil press plays a crucial role in both the secondary pressing and single solvent extraction processes. In the continuous pressing stage, it can improve the pressing efficiency and ensure stable output. For example, the ZY24 can increase the pressing efficiency by about 20 - 30% compared to traditional oil presses, and it can also reduce the residual oil rate in the cake by about 1 - 2 percentage points.
Here are some practical judgment criteria to help you decide which process to choose:
We recommend establishing a process selection toolkit and continuously updating the matching strategies for different oilseeds. This will help you make more informed decisions as the market and raw material conditions change.
Are you interested in learning more about the ZY24 screw oil press's adaptation details in continuous pressing? Click here to access our product page or download our whitepaper for in-depth information.
