Soymilk Processing Line
A soymilk line where deodorising and enzyme deactivation decide whether the product tastes neutral or beany, and where protein stability decides whether it survives UHT.
Key Specifications
| Capacity | 1,000 / 3,000 / 8,000 / 15,000 L per hour |
|---|---|
| Raw material | Whole soybeans, soy protein isolate, or blend |
| Deodorising | Vacuum flash, 0.06-0.08 MPa |
| Enzyme deactivation | ≥ 95 degrees C for 5 minutes (lipoxygenase) |
| Homogenisation | 250 bar two stage |
| Sterilisation | UHT 140 degrees C for 4 seconds |
| Shelf life | 6-9 months ambient |
Beany flavour comes from an enzyme, not the bean
Lipoxygenase reacts within seconds of grinding to produce the green, beany notes consumers reject. Deactivating it by grinding hot, or by a rapid heat step immediately after grinding, is the single most important design point on a soymilk line.
Deodorising removes what heat cannot
Vacuum flash deodorising strips volatile off-notes after enzyme deactivation. It is what turns an acceptable product into a neutral one that can be flavoured.
Protein stability under UHT
Soy protein destabilises at UHT temperature if pH and mineral balance are wrong, producing sediment or gel. Homogenisation at 250 bar plus pH adjustment to 7.0-7.2 before sterilisation prevents it.
Typical Applications
- Plant-based milk producers — Neutral soymilk is the base for flavoured and barista variants.
- Tofu and soy food plants — The same upstream supplies soymilk for coagulation, with concentration adjusted.
- Asian markets with established soy demand — Ambient soymilk in cartons is a mainstream category, not a niche.
Frequently Asked Questions
Can I use soy protein isolate instead of beans?
Yes, and it removes the soaking and okara handling. Isolate costs more per kg of protein but simplifies the line considerably.
How do I stop sediment forming?
Two-stage homogenisation at 250 bar plus pH adjustment and adequate stabiliser. Sediment after UHT almost always traces to one of these three.
Is the okara waste a problem?
It is about 1.1 kg per kg of dry beans. Plan for animal feed use or a dewatering system before commissioning.
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