Soybean
Why soybean is the exception
Most oilseeds are pressed because they are oil-rich; soybean is processed because it is protein-rich, with oil as a valuable co-product. At only ~18–20% oil, soybean does not give up its oil economically to a screw press — the residual left in pressed cake represents too much lost value. This is why the global soybean industry runs on solvent extraction, which reaches very low residual oil (often ~1% in the meal) and produces the defatted, high-protein soybean meal that feeds much of the world's livestock. The oil is a large business in absolute terms, but the meal frequently drives the crush economics.
Processing route and where pressing fits
A commercial soybean crush cleans, cracks, dehulls (for high-protein meal), conditions and flakes the beans, then solvent-extracts the flakes; the crude oil is degummed and refined, and the meal is desolventized and toasted. Mechanical pressing has a niche — small-scale or full-fat soy products, or expeller "mechanically extracted" soy oil marketed as solvent-free — but it leaves more oil in the cake and rarely competes on oil economics at scale. For a small mill choosing crops, soybean is usually a poorer pressing candidate than high-oil seeds like sunflower or groundnut, precisely because its value is locked in protein that a simple press cannot fully unlock.
Meal-driven economics
Understanding soybean means understanding that the meal often matters more than the oil. Defatted soybean meal is a benchmark protein ingredient; its price and demand shape whether crushing is profitable, sometimes more than the oil price does. This inverts the usual oilseed logic and explains soybean's reliance on solvent extraction: the goal is to strip nearly all oil out so the meal is a clean, high-protein product, with the extracted oil refined to commodity cooking oil. A mill or trader working with soybean should track meal markets as closely as oil markets.
Typical processing route
Cleaning → Dehulling → Pressing / extraction → Refining → Filling
Estimate output for this seed with the oil yield calculator, and choose a route with the cold-vs-hot chooser.
Key figures (indicative)
| Parameter | Typical range |
|---|---|
| Oil content | ~18–20% (low for an oilseed) |
| Standard route | solvent extraction |
| Meal | high-protein, benchmark feed |
| Pressing fit | niche / small-scale only |
| Oil use | refined commodity cooking oil |
FAQ
Why is soybean solvent-extracted instead of pressed?
Its oil content is low (~18–20%), so pressing leaves too much oil in the cake. Solvent extraction reaches ~1% residual and yields the high-protein meal that drives soybean economics.
Can I press soybean oil in a small mill?
You can, for full-fat or expeller soy products, but you will leave more oil in the cake and rarely match solvent-plant economics. Higher-oil seeds usually press more profitably.
What is soybean meal used for?
Defatted soybean meal is a benchmark protein feed for livestock — often the main economic driver of a soybean crush, sometimes more than the oil.
Is expeller soybean oil different?
Expeller (mechanically pressed) soy oil is marketed as solvent-free and commands a niche premium, but yields less oil per bean than solvent extraction.