一、Process Flow

二、Process Description

1. Steeping: Put the rice in the impregnation tank, add 0.3 ~ 0.5% sodium hydroxide (caustic soda) solution 5 times the amount of rice, and immerse for 24 hours to soften the rice and extract protein. The steeping temperature is usually 50 ℃ Then drain the lye, wash it once with clean water, and add new lye to soak for 36 to 38 hours.

2. Refining: After the rice is immersed in water, it swells with water, and is squeezed and crushed with fingers. Wet mill into a slurry with a grinder or hammer mill, and add an appropriate amount of 0.3 to 0.5% sodium hydroxide solution while grinding.

3. Separation: The rice slurry is precipitated or sent to a centrifuge for separation, and the resulting wet lake is rinsed with clean water many times, refined, and then dried to obtain rice starch.

4. Recovery of protein: The remaining rice sodium hydroxide hydrochloride impregnating solution is neutralized with acid or sulfur dioxide to the pH isoelectric point (pH 6.4) of the protein. After dehydration and centrifuge separation treatment, the protein can be recovered.