Edible Oil Manufacturing Process
From raw oilseeds to refined cooking oil — discover the complete production and refining process at HowFun Oil's modern manufacturing facility in Ningbo, China.
Our Manufacturing Capabilities
Ningbo HowFun Oil operates a modern production base in Qianwan New Area, Zhejiang Province, equipped with advanced processing lines for soybean and edible vegetable oil refining. Our facility combines traditional mechanical pressing techniques with modern solvent extraction and full refining capabilities to serve diverse B2B requirements.
Oil Extraction Methods
The first step in edible oil production is extracting oil from oilseeds. There are two primary methods, each suited to different types of seeds and product requirements.
Mechanical Pressing
Cold Press & Hot Press
Mechanical pressing uses physical force to extract oil from oilseeds without chemical solvents. This method preserves more natural flavors, aromas, and nutrients, making it ideal for premium oils like Extra Virgin Olive Oil, cold-pressed peanut oil, and specialty sesame oil.
Key Advantages
- No chemical solvent residue
- Preserves natural flavor and aroma
- Higher nutritional value retention
- Suitable for premium and specialty oils
Common Applications: Extra Virgin Olive Oil, cold-pressed peanut oil, sesame oil, and specialty premium oils
Solvent Extraction
Hexane Extraction Process
Solvent extraction uses food-grade hexane to dissolve oil from pre-pressed oilseed cakes, achieving higher extraction rates (over 99%). This method is widely used for large-scale production of soybean oil, sunflower oil, rapeseed oil, and corn germ oil where maximum yield is essential.
Key Advantages
- Extraction rate over 99%
- Higher overall oil yield
- Cost-effective for large-scale production
- Suitable for low oil-content seeds
Common Applications: Soybean oil, sunflower oil, rapeseed oil, corn germ oil, and blended vegetable oils
The Complete Refining Process
After extraction, crude oil undergoes a four-stage refining process to remove impurities, improve stability, and produce a clean, safe cooking oil suitable for food applications.
Degumming
Phospholipid Separation
Crude oil contains phospholipids, gums, and other colloidal substances that must be removed before further processing. In the degumming stage, the crude oil is mixed with warm water or acid (such as phosphoric acid), which causes the gums to hydrate and clump together. These hydrated gums are then separated by centrifugation.
Purpose
Remove phospholipids, proteins, and mucilaginous substances
Result
Improved oil stability and preparation for subsequent refining steps
Deacidification
Neutralization Process
Free fatty acids (FFA) in crude oil affect flavor, stability, and smoke point. During deacidification (also called neutralization), an alkaline solution such as sodium hydroxide (NaOH) is added to the oil. The alkali reacts with free fatty acids to form soap stock, which is then separated by centrifugation. The oil is then washed with water to remove residual soap.
Purpose
Reduce free fatty acid content to acceptable levels
Result
Lower acid value, improved taste and oxidative stability
Bleaching
Decolorization Process
Crude oil contains natural pigments such as chlorophyll, carotenoids, and gossypol that give it a dark or cloudy appearance. In the bleaching stage, the oil is mixed with activated clay or activated carbon under vacuum and heated. The adsorbent materials bind to the pigments and trace impurities, which are then filtered out, leaving the oil with a lighter, clearer color.
Purpose
Remove pigments, trace metals, and residual soap
Result
Lighter color, clearer appearance, and cleaner flavor profile
Deodorization
Steam Distillation
Even after bleaching, refined oil may still contain volatile compounds that cause off-flavors and odors. Deodorization is the final step of physical refining. The oil is heated to high temperatures (200-270°C) under high vacuum, and steam is injected. The vacuum and steam strip away volatile compounds, free fatty acids, and any remaining odor-causing substances, resulting in a neutral-tasting, odorless oil.
Purpose
Remove volatile compounds, odors, and remaining free fatty acids
Result
Neutral flavor, high smoke point, and extended shelf life
Crude Oil vs Refined Oil
Understanding the difference between crude and refined oil helps B2B buyers make informed sourcing decisions.
| Aspect | Crude Oil | Refined Oil |
|---|---|---|
| Appearance | Dark, cloudy, opaque | Clear, bright, transparent |
| Flavor & Odor | Strong natural flavor, may have off-odors | Neutral taste and odor |
| Free Fatty Acid | High (varies by source) | Very low (≤0.1-0.5%) |
| Smoke Point | Low, not suitable for high-heat cooking | High (200-250°C+), suitable for frying |
| Shelf Life | Shorter, prone to oxidation | Longer, more stable |
| Impurities | Contains gums, pigments, trace metals | Minimal impurities after full refining |
| Applications | Limited, requires further processing | Ready for cooking, frying, baking, and food processing |
Quality Control During Manufacturing
Every stage of our manufacturing process is monitored to ensure consistent quality and food safety.
Raw Material Inspection
All incoming oilseeds undergo moisture, impurity, and quality testing before acceptance
In-Process Monitoring
Critical control points monitored at extraction, refining, and filtration stages
Finished Product Testing
Every batch tested for acid value, peroxide value, moisture, color, and flavor
Pre-Shipment Verification
Final inspection and Certificate of Analysis (COA) issued for each shipment
Key Quality Parameters We Monitor
Testing methods follow international standards. Specific parameters and acceptable ranges may vary depending on oil type and destination market requirements.
Frequently Asked Questions
What is the difference between crude oil and refined oil?
Crude oil is the raw oil extracted directly from oilseeds through pressing or solvent extraction. It contains impurities such as gums, free fatty acids, pigments, and volatile compounds. Refined oil has undergone a complete refining process including degumming, deacidification, bleaching, and deodorization, resulting in a clear, stable, neutral-tasting oil suitable for cooking and food processing.
What is the difference between mechanical pressing and solvent extraction?
Mechanical pressing uses physical force to squeeze oil from seeds, preserving natural flavors but yielding less oil (typically 60-80% extraction). Solvent extraction uses food-grade hexane to dissolve oil from pre-pressed cakes, achieving over 99% extraction efficiency. Pressing is preferred for premium oils like olive oil and sesame oil, while solvent extraction is standard for soybean, sunflower, and rapeseed oil production at scale.
Why is deodorization important in edible oil refining?
Deodorization removes volatile compounds that cause off-flavors and odors in oil. It also reduces free fatty acid content and increases the oil's smoke point. Without proper deodorization, the oil would have an unpleasant taste and smell, and would not be suitable for most cooking applications. This step is critical for producing neutral-tasting refined oils.
Does the refining process remove nutrients from the oil?
Refining does reduce some natural compounds such as tocopherols (vitamin E) and phytosterols. However, the core nutritional profile including the fatty acid composition remains largely intact. For oils where nutrient retention is a priority, partial refining or cold-pressing methods may be used. The refining process primarily targets impurities that affect flavor, stability, and safety.
What quality certifications does HowFun Oil hold?
HowFun Oil maintains ISO 22000, HACCP, and Food Safety Management System certifications. Our production facility follows strict quality control protocols at every stage from raw material inspection to finished product testing. Additional certifications such as Halal, Kosher, BRC, and IFS are available depending on product specifications and destination market requirements.
Looking for a Reliable Edible Oil Manufacturer?
From raw material sourcing to refined oil production and export delivery, HowFun Oil provides end-to-end edible oil manufacturing solutions for B2B buyers worldwide.