Germ extraction production technology for corn alcohol by semi-dry method

The invention relates to a germ extraction production technology for corn alcohol by a semi-dry method. The corn alcohol is prepared by the steps of grain cleaning, grain wetting by vapor, degerming and germ selection. According to the invention, with the adoption of the grain wetting technology by vapor, the grain wetting time of corn is greatly shortened, the grain wetting effect of the corn is achieved at normal temperature, batch processing can be performed, and the germ extraction technology is not influenced by weather and temperature; the powder amount is small, the whole particle size portion of germs is large, and the whole particle size of germs is generally 85 percent, so that reliable guarantee is provided for next procedures, including germ extraction, germ selection, oil expression and alcohol raw material production; and during germ selection, large germs, large endosperms, middle germs, middle endosperms, small germs and small endosperms can be selected out, the purity of germs is more than 98