Difference between oil pressing and oil extraction
Oil pressing and oil extraction are two different methods of obtaining oil from seeds, nuts, or other oil-bearing materials. Here's a breakdown of the two processes:
Pressing method: It is a method of extracting oil from oilseeds by physical pressing. It originated from the oil-making method of traditional workshops. Today's pressing method is an industrialized operation; pressed oil is a product that squeezes out the oil contained in the oilseed after the oilseed kernels are crushed, rolled, steamed, and pressed. It is a physical oil-making method.
Oil Press Features:
1、No Chemicals: It is typically a chemical-free process.
2、Low Temperature: Cold pressing keeps the temperature below 50°C, retaining the oil's nutrients and flavor.
3、Uses: Common for producing edible oils like olive oil, sesame oil, and coconut oil.
4、Output: Generally lower oil yield compared to solvent extraction.
Extraction method: It is a method of extracting oil from oilseeds using physical and chemical principles and non-food grade solvents. Extracted oil is the oilseed kernels that are crushed, rolled, steamed, and fried, and the oil in the oilseed is extracted using edible grade solvents (n-hexane). It is a chemical extraction oil-making method.
Oil Extraction Features:
1、Chemical-Based: Uses solvents for higher efficiency.
2、Higher Oil Yield: Extracts almost all the oil from the material.
3、Refining Needed: The crude oil often requires refining to remove impurities.
4、Uses: Common for large-scale industrial oil production (e.g., soybean oil, sunflower oil, and rapeseed oil).
Whether it is pressing or extraction, this step only solves the production of crude oil. Under normal circumstances, crude oil cannot be eaten directly, but needs to go through various physical and chemical steps to treat various impurities in the crude oil, such as cottonphenol, aflatoxin, solvent residues, etc.
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