The invention relates to a process for extracting sweet potato
protein by a
thermal deposition method. The process is characterized by comprising the following steps of: treating
cell sap to extract the sweet potato
protein from the
cell sap while producing sweet
potato starch, separating and purifying by using a disc separator according to the difference of
specific gravity of the
protein and other substances such as
starch and the like, removing fine fibers according to the
solubility of the protein and the size of particles, and further purifying; purifying, concentrating, and degeneratingthe sweet potato protein to generate floccules according to the characteristic that the protein is degenerated at high temperature by a physical heating method; and concentrating, squeezing for dehydrating,
drying, sieving, and performing aftertreatment to obtain a sweet potato protein commodity. The invention has the advantages that: (1) the sweet potato protein is degenerated by a steam jet
cell sap heater, a moving part is not provided, and
continuous production is ensured; (2) chemicals such as a flocculating agent and the like are not added, so that
pollution is avoided, and subsequent treatment difficulty is reduced; and (3) the process is technically mature, and the industrial production capacity can be achieved.