摘要
该文以甜高粱茎秆汁液为原料,探讨了温度(25～37℃)对甜高粱汁固定化酵母酒精分批发酵的影响,并对不同温度下固定化酵母乙醇发酵的动力学模型进行了研究。结果表明:温度的升高可以提高细胞生长速率,但过高的温度却阻碍了细胞的生长,从而影响了酒精的产量。应用Hinshelwood模型,分别对酒精发酵过程中细胞生长动力学和酒精合成动力学进行了模拟,得到25～34℃范围内不同温度下各种动力学参数。在此基础上,进一步研究了温度同细胞生长动力学参数之间的内在联系,得到酒精分批发酵过程中酵母细胞质量浓度的变化同温度以及底物质量浓度之间的一般关系式,验证试验结果表明,该模型具有很好的适用性。
The effect of temperature from 25℃ to 37℃ on ethanol production in batch fermentation of sweet sorghum stalk juice by immobilized Saccharomyces cerevisiae was investigated. In addition, kinetic models were studied. The result shows that cell growth is hastened with the increase of temperature, but too high temperature has a negative influence on the cell growth, and the ethanol yield will be decreased. Hinshelwood equation was successfully applied to estimate the kinetics of cell growth and ethanol production. The kinetic parameters at different temperature from 25℃ to 34℃ were obtained. Based on the estimated parameters, the effect of temperature on the kinetic parameters of cell growth was further studied. An equation was developed and applied to interlink the relationship between yeast cell concentration and temperature as well as substrate concentration in the process of ethanol production in batch fermentation. The exoerimental results showed that this model could predict the growth pattern very well.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第11期258-262,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
农业部948项目:"农业生物质能先进技术引进与产业化(2008G2)"资助
关键词
酒精
酵母
发酵
温度
动力学模型
ethanol
yeast
fermentation
temperature
kinetic models
