Solid-liquid Complex Fermentation Mode Of Distillate Spirits And Its Kinetic Study

Distillate spirits is a kind of Chinese traditional beverage.Although it has a history of thousand years,it still keeps its age-old productive model with great (?) consumption,qualitative but not quantitative production process (?),all of which is adverse for development of distillate spirit production.(?) on such a status,this paper carried out the following study in (?) to new production mode of distillate spirit:①The relationship between key factors of main fermentation and (?)The main content includes:the effect of (?) production; (?) grain (?) temperature; the effects of Daqu depot time on (?) nature and (?); the effects of putting in acidity on grain consumption; the relationship of other important factors.The inside temperature change tendency of Daqu can be obtained from its cultivation,and regression analysis was conducted.When putting in temperature was above 17℃,the grain consumption rised with rising putting in temperature.The heatingup time was shortened with putting in temperature raises.When shelf life of Daqu was 6 months,the number of yeast achieved the crest value of about 8×10~5/g;the bacteria number approximated the minimum of about 0.8×10~5/g;the water content droped to 12%;the acidity was 0.86mmol/10g,close to the optimum 1mmol/10g;the liquefy capacity was 1.4g/g.h,the fermentation capacity was 2.1g/g.h,and the saccharogenic power is 1.5g/g.h,all of them fit best; so 6 months of shelf life is eligible.The rise of putting in acidity can cause the rise of grain consumption.Regression analysis for the factors of starch concentration,yeast number,temperature,acidity and spirits output was conducted.The result showed that correlation among the five factors was great; starch concentration and temperature are significant factor.②The foundation of fermentative kinetic equationFermentative kinetic equation can be founded on the basis of analysis on microbiological growth,productive formation and consumption of substrate. ③The selection of optimum condition and deduction on initial kinetic equation about estrificationBiosynthesis process of four kinds of esters that can affect the quality was studied.The results showed that the optimum temperature is 35℃,the optimum ratio of acerbity and alcohol is 1:5-7.Based on the optimum condition study, the kinetic equation of hexylic acid esterification was deducted, and its initial kinetic equation catalyzed by Daqu is obtained :④The foundation of new productive modeBased on the above operation,new fermentative mode was studied.The experiment was carried out with mixture of yellow water.With the new fermentative mode,total acerbity increased 116.3% and total ester 38.55%,and the output 20.24%.