Method for producing high-purity rice protein powder and rice syrup

A method for producing a high-purity rice protein powder and a rice syrup, comprising the steps of:

• S1, crushing rice, adding water for blending to obtain a first slurry, and homogenizing the first slurry with a high pressure homogenizer to obtain a second slurry;
• S2, adding amylase into the second slurry, heating the resulting mixture, and performing heat preservation so that the second slurry sufficiently reacts with the amylase to obtain a raw rice syrup liquid;
• S3, subjecting the raw rice syrup liquid to centrifugal separation to separately obtain a liquid-phase rice sugar liquid and a first precipitate;
• S4, sequentially subjecting the liquid-phase rice sugar liquid obtained in S3 to decoloration, ion exchange, and evaporation to obtain the rice syrup;
• S5, adding second wastewater into the first precipitate obtained in S3, performing washing and performing centrifugal dewatering to obtain a second precipitate;
• S6, adding pure water into the second precipitate, performing uniform stirring, and performing heating and heat preservation to obtain a solid-liquid mixed material;
• S7, subjecting the material to filtration and dewatering to obtain a filter cake and second wastewater;
• and
• S8, crushing and drying the filter cake to obtain the high-purity rice protein powder.