摘要
利用实验室自行筛选的高效酵母菌株TSH-SC-1,以甜高粱秆为原料进行固态发酵制燃料乙醇,在24h内总糖转化率为95.6%,发酵料中残糖浓度为0.45g/100g湿料,乙醇得率为理论值的84.9%。通过计算机实时采集和记录发酵过程中固态物料的温度和重量的数据,并且通过数值求导得到发酵过程中两者变化的速率。结果表明,两者均能够比较一致地反映固态发酵过程的内在变化,因而温度变化的实时数据可以作为过程监控和诊断的依据。另外,由发酵过程温度变化、散热数据和乙醇得率,估算了固态发酵生成每摩尔乙醇的放热量为56kJ,该数据可以用于固态发酵反应器的工程设计和优化放大。
Sweet sorghum stalks was used as raw materials by solid feremation by lab-screened high-efficiency yeast strain TSH-SC-1 to produce fuel ethanol. Within 24 h after the fermentation, the conversion rate of total sugar was 95.6 %, the residual total sugar was 0.45 g·（100 g substrate （wet basis））-1 and ethanol yield was 84.9 % of theoretical yield. Weight data and temperature data of substrate were recorded automatically by computer at a constant time interval during the fermentation, and the relationships between them were studied. The results showed that they could coherently reflect the internal change in solid fermentation process. Accordingly, the real-time data of temperature could be used effectively to monitor and control the fermentation process online. In addition, based on temperature change in the fermentation, heat emission and ethanol yield, the heat of fermentation was calculated approximately to be 56 kJ·（mol ethanol） -1, which could be used in the design, the simulation and the optimization of bioreactors for solid fermentation of sweet sorghum stalk to produce fuel ethanol.
出处
《酿酒科技》
2010年第6期24-27,31,共5页
Liquor-Making Science & Technology
基金
天津市科技发展计划项目(No.06YFGZSH02700)
国家科技支撑项目(No.2007BAD42B00)
关键词
燃料乙醇
甜高粱秆
固态发酵
失重
热效应
fuel ethanol
sweet sorghum stalks
solid fermentation
weight loss
thermal effects
