10 to 500TPD Sunflower oil extraction machine

Expeller Pressing

Pre-treatment Steps
This initial stage prepares the seeds for efficient oil extraction by removing impurities and conditioning them.
Cleaning & De-Stoning: Raw seeds are passed over vibrating screens and through destoners to remove dirt, dust, sand, stalks, and other foreign materials.
Dehulling (Hulling): A centrifugal sheller or impact huller cracks the seeds, and a winnowing system separates the kernels from the shells.
Size Reduction & Conditioning: The kernels are mechanically crushed or flaked using roller mills to increase surface area. They are then gently heated in a cooking pot to adjust moisture content and plasticity, which facilitates oil extraction.
Oil Extraction Stage: Pressing
To mechanically separate the oil from the solid seed cake.
The prepared material is fed into a screw press (expeller). The resulting products are:
Crude Pressed Oil: Contains some solids and impurities, requiring further filtration.
Press Cake: A solid residue with substantial nutritional value, often sold as animal feed.
Cold Pressing involves pressing at temperatures below 60°C to retain more natural nutrients and flavor, producing a premium-quality oil.
Hot Pressing uses higher temperatures during conditioning, resulting in higher yields but a more intensely flavored oil.

Preprocessing & Pre-Pressing

The initial cleaning, dehulling, and conditioning steps are similar to the pressing method.
Pre-Pressing: Prepared seeds are first passed through a screw press to remove a significant portion (typically 60-80%) of the oil . This creates partially de-oiled cake, which is broken into smaller pieces for efficient solvent contact.
Solvent Extraction
The pre-pressed cake is fed into an extractor (often a counter-current system).
Solvent Contact: The meal is washed with a food-grade solvent, which dissolves the remaining oil .
Separation: Two streams exit the extractor:
Miscella: A mixture of solvent and oil.
Spent Meal: Solids saturated with solvent
From Spent Meal: The wet meal undergoes a desolventizing process (typically using steam and heat) to strip away the solvent, which is also recovered. The resulting dry meal is a high-protein animal feed product.

Sunflower Oil Refining

Oil from solvent extraction must be refined to be edible, as it contains impurities and traces of solvent. Process: This multi-step process (Degumming, Neutralization, Bleaching, Deodorization) removes gums, free fatty acids, pigments, odors, and any solvent traces . The result is a clear, mild, stable, and shelf-ready refined oil.
Customized Plant Design: Tailoring Sunflower Oil Production Line capacity (from 10 to 500TPD) and configuration to your specific needs and raw materials. Welcome to visit our factory for business negotiation.