Application of Redistillation in the Production of Nongxiang Baijiu
In order to reduce the content of ethyl acetate and improve the quality of Nongxiang Baijiu,we adopted the tower distillation equipment to redistill the Nongxiang crude liquor with high ethyl acetate content.By monitoring the changes of the content of ethyl acetate,total acids and other volatile components,we determined the tower layer material,the tower layer number and the amount of the head liquor.The results showed when the tower layer material was red copper,the tower layer number was 7,and the head liquor was 4.0％,the content of ethyl acetate decreased from 272.79 mg/100 mL to 126.62 mg/100 mL(53.58％)after redistillation,while the total acids increased from 1.48 g/L to 1.58 g/L.Sensory evaluation showed that the aroma of the redistilled crude liquor was comfortable and refreshing,the taste was mellow,sweet and coordinated,and the aftertaste was clean.In conclusion,redistillation can maintain the content of total acids and reduce the content of ethyl acetate of the crude liquor to the full extent,and can be used to improve the quality of the crude liquor.
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