The invention provides a method for extracting
alcohol by using a by-product after
garlic oil production, which comprises a pretreatment step, a
fermentation step, a
distillation step and a refining step, and through the combination of crushing and high-temperature cooking,
starch in the garlic by-product is fully gelatinized, the
cell wall structure is destroyed, and the
alcohol content is reduced; more importantly, infectious microbes possibly carried in the raw materials are effectively killed, and a
solid foundation is laid for subsequent pure
fermentation;
amylase and saccharifying
enzyme are selectively added for enzymolysis, so that macromolecular carbohydrates are further accurately degraded into fermentable sugars which can be directly utilized by
yeast, the saccharification rate of the raw materials is remarkably improved, and a core guarantee is directly provided for improving the final
ethanol yield. Through combination of normal pressure rectification and pressurized rectification,
ethanol is separated and concentrated, and through
deep processing units such as
molecular sieve dehydration or blending and aging, diversified
alcohol products from industrial fuel and medical disinfection to high-end drinking can be flexibly produced by the same basic process, so that the application range and the economic value are expanded.