Soybean Protein Concentrate(SPC) Technology

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Soybean Protein Concentrate (SPC) Production Line

Removing alcohol soluble and water soluble matter from soya meal by ethanol, and recycling ehanol.

Food grade SPC is usually used as additives of flour-made food and meat products. It is also applied for production of health care products, which contain about 70 percent protein.

Feed grade SPC is applied as feed additives in particular, which are put in fodders for baby pigs, aquatic livestock, calves or pets.


1. Raw Materials: low-temperature soybean meal(white flake)

2. Products: food grade or feed grade soybean protein concentrate (SPC)

3. By-Products: soybean syrup

SPC Process

1. Process Workflow:

In CHEMSTA SPC production line, edible alcohol is used to extract and separate water-soluble components (mainly soluble sugars) from low-temperature soybean flakes. The resulting soybean product will be extruded, smashed, desolventized, dried and superfinely milled, thus obtaining soybean protein concentrate. The whole production process won`t generate water pollution and air pollution, which is environmental friendly. CHEMSTA SPC production process will become the prominent method for production of SPC in the future. In China, almost all  SPC plant built by CHEMSTA recent years, the capacity from 10000 tons one year to 70000 tons one year.

Process: Removing powder out of low-temp meal by grading screen, conveying the screened meal to CHEMSTA SPC Extractor, and using ethanol to remove alcohol soluble and water soluble matter from soya meal. Through multistage backward immersion and spray, dissolving soluble saccharides, and thin molasses is obtained and flew out of extractor.

Extracted solid material flows into CHEMSTA Extruder, after extruding part of water, and then goes into drying machine. Under vacuum, removing ethanol, adjusting moisture, and going to product warehouse to proceed crushing, measuring and bagging. Gas out of dryer flows into dry fines catcher and condenser successively. The noncondensed gas will flow into frozen recovery system.Removing powder out of thin molasses through cyclone hydraulic separator, and after evaporation and concentration, the molasses concentration will be up to 47-50%, and the ethanol almost removed. Adopting further evaporation, he molasses concentration will reach above 55%; oligosaccharide and isoflavone can be extracted from evaporated molasses; or mixing evaporated molasses together with soya hulls, to enhance feed nutritive value as additive. Ethanol gas flows into condensing and recycling system.

2. Major Equipment:

SPC Extractor, extruder, horizontal desolventizer, vertical dryer, evaporation and concentration system for syrup, condenser for recycle of ethanol steam, recovery system for exhaust gas, protein conveying and cooling system, protein smashing and packing system, rising conveyor and other auxiliary devices.

Automatic Control System

In CHEMSTA production lines, we make use of Siemens PLC control system, which is one of mainstream automatic control systems in today`s industry. The efficient, stable and advanced DCS control system consists of operation station, control station and communication network. We utilize high-speed and large-capacity S7-400 series PLC at the control system, large-screen LCD at the operation station, WINCC 7.0 industrial control software as monitoring software and PROFIBUS filed bus network for communication.


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