Introduction to Edible Oil Filtration
Edible oils are indispensable in daily life. There are many types of cooking oil, including peanut oil, soybean oil, sunflower oil, sesame oil, linseed oil, tea oil, evening primrose oil, sesame oil, and grapeseed oil. Beyond kitchens, they serve as raw materials in cosmetics, pharmaceuticals, lubricants, biofuels, and more. However, their value lies not only in availability but also in purity and safety. Filtration ensures oils meet strict standards of clarity, stability, and compliance before reaching consumers or industries.
As global demand grows, reliable and efficient filtration systems have become essential. Great Wall Filtration provides food-grade filter sheets specifically designed for the challenges of edible oil refining—high temperatures, non-polarity, and diverse impurities.
Why Filtration is Critical in Edible Oil Refining
Oil refining is a multi-step process, each targeting specific impurities:
1. Phospholipids & Gums – cause cloudiness and rancidity.
2. Free Fatty Acids (FFAs) – affect taste and shorten shelf life.
3. Pigments, Waxes, Metals – alter color and stability.
4. Volatile Compounds – create undesirable odors and flavors.
It has strong water absorption performance and can effectively absorb the moisture in the oil and retain the original aroma of the oil.
Even after chemical treatments, oils may retain fine particles or by-products. Food-grade filter sheets act as the final safeguard, ensuring safety, stability, and compliance.
Great Wall Filtration’s Role in Refining
Great Wall Filtration is a global leader in food-grade filter sheets (0.2–20 µm), adaptable to every stage of oil refining. Key strengths include:
1. Technical Precision – tailored filtration from crude oil to final polishing.
2. Safety First – non-toxic, food-grade materials that meet FDA, EFSA, and ISO standards.
3. High Performance – engineered for heat resistance and challenging refining conditions.
4. Economic & Practical – energy-saving, easy to use, and globally trusted.
5. Environmentally friendly and sustainable products - made of biodegradable materials, no pollution
Filtration at Each Refining Stage
1. Degumming – Removing Phospholipids Fine sheets (0.2 µm) ensure complete removal of gums, preventing rancidity.
2. Neutralization – Eliminating FFAs Captures soap residues post-alkali treatment, enhancing flavor and stability.
3. Bleaching – Clarifying & Stabilizing Removes pigments, trace metals, and oxidation by-products with precision.
4. Deodorization – Neutral Taste & Odor Withstands extreme heat during steam distillation, ensuring neutrality for sensitive applications.
5. Winterization – Clear Oils in Cold Captures wax crystals for oils like sunflower and safflower, ensuring clarity under refrigeration.
6. Polishing & Final Filtration Guarantees purity before storage, packaging, and transport.
Engineering Excellence for Different Oils
Different oils pose unique challenges:
• Sunflower Oil – wax content requires effective winterization.
• Soybean Oil – high phospholipids demand precise degumming.
• Sesame and Peanut Oil– Premium oils that need polishing filtration for clarity and premium quality.
• Flaxseed Oil (Linseed Oil) – High in mucilage and prone to oxidation, requiring gentle polishing filtration.
• Perilla Seed Oil – Sensitive to oxidation; fine filtration is needed to preserve aroma and freshness.
• Olive Oil – Difficult to filter due to suspended solids and moisture; depth filtration ensures clarity and stability.
• Grape Seed Oil – Contains fine particulates; requires efficient polishing filtration for brightness and shelf stability.
• Avocado Oil – High viscosity demands robust depth filtration to remove pulp and colloidal matter.
• Walnut Oil – Rich in delicate flavor compounds; gentle polishing filtration is necessary without stripping aromas.
• Black Truffle Oil – Premium infused oil; microfiltration maintains clarity while preserving volatile aromas.
• Coconut Oil – Requires clarification to remove suspended solids; polishing ensures a crystal-clear appearance.
• Milk Thistle Seed Oil – High in bioactive compounds; fine filtration is needed to retain purity and medicinal quality.
• Safflower Seed Oil – Similar to sunflower oil, may require dewaxing and polishing for clarity.
• Tea Seed Oil (Camellia Oil) – Traditional edible oil; polishing filtration enhances brightness and consumer appeal.
• Perilla Seed Oil – Rich in omega-3 and highly oxidation-sensitive; requires gentle fine filtration to preserve freshness and aroma.
• Hemp Seed Oil – Contains suspended solids and natural waxes; polishing filtration is essential for clarity and extended shelf life.
Great Wall’s versatile pore size range and durability ensure consistency across all oil types.
Great Wall Filtration Provides Filter Sheets
These are specifically designed for use in the edible olil production process.
Oil Filter paper
The products are made from particularly pure natural materials: cellulose and more. This grade filter paper is widely used in food, beverage, oil industries and so on.
High purity cellulose
It does not add any mineral filter AIDS, has extremely high cellulose purity, can adapt to different chemical environments such as acids and alkalis, greatly reduces the risk of metal ion precipitation, and can well retain the color and aroma of the filtered liquid.
Standard
Depth filter sheet with high-quality filter AIDS features high stability, wide application range, high inner strength, ease of use, strong endurance and high safety.
Modules
The membrane stack modules of Great Wall can contain different types of cardboard inside. When paired with membrane stack filters, they are easy to operate, isolated from the external environment, and more hygienic and safe.
Meeting International Standards
• Food Safety – FDA, EFSA compliance for human consumption
• ISO Certifications – assurance of consistent quality.
• Sustainability – alignment with eco-friendly practices and efficient production.
Conclusion
Edible oil refining is a complex, multi-step journey where filtration plays a decisive role. From degumming to polishing, Great Wall Filtration ensures oils are safe, clear, stable, and compliant—whether destined for kitchens, cosmetics, pharmaceuticals, or industrial applications.
By combining safety, precision, and global expertise, Great Wall Filtration continues to shape the future of edible oil refining worldwide.
FAQs
Why are food-grade filter sheets essential?
They ensure oils are free from harmful residues, safe for consumption and industrial use.
Which oils benefit from Great Wall Filtration?
Sunflower, soy, rapeseed, palm, sesame, peanut, avocado, and more.
Can filters withstand high refining temperatures?
Yes. Great Wall sheets are engineered for extreme heat and oil’s non-polar nature.
Beyond food, where are refined oils used?
Cosmetics, pharmaceuticals, lubricants, biofuels, paints, soaps, and coolants.
Why recommend Great Wall Filtration filter paper?
The filter paper of Great Wall Filtration can absorb the water in the oil to the maximum extent and retain the aroma of the oil.
