本文运用TRIZ理论矛盾分离原理对酒精发酵CO2气纯化回收工艺系统进行分析,利用条件分离方法和系统分离方法解决系统中存在的物理矛盾,再根据技术系统进化法则构造回收系统进化方案,优化集成"复合精洗+再生吸附+节能干燥+低温精馏"工艺组合,创新设计酒精发酵气二氧化碳回收纯化工艺系统,简化工艺流程,大幅降低工艺系统能耗的同时提高二氧化碳产品的性能指标,实现除杂后的CO2体积分数达到99.99％,获得高纯度食品级CO2,从而提高发酵气CO2回收利用的经济效益.
The production of ethanol by semi-continuous simultaneous saccharification and fermentation using cassava as a raw material was investigated.The processing conditions were: cassava particle size Φ1.5mm,ratio of cassava to water 1∶2.3,α-amylase content 9U/g-cassava,glucoamylase content 120U/g-cassava,steaming at 95℃ for 90min～110min,pre-saccharification at 60℃ for 35min～40min followed by prior fermentation at 28℃ and posterior fermentation at 32℃,and the total fermentation time 69h.Under these conditions,the ethanol concentration reached 13.5%vol.The semi-continuous fermentation lasted 17d.The results would be beneficial for industrialization.
Cassava is an important worldwide starch-containing root crop. In south China, cassava, not a staple food, is of significant economic values. In this paper, research progress in cassava fermentation to produce ethanol at home and abroad was reviewed and the development measures were proposed.
