拟薄水铝石-海藻酸铝固定化酵母生产乙醇  

Immobilization yeast of Al alginate-based pseudo-boehmite for ethanol production

作　　者：郑春明[1,2] 孙晓红[1] 章福祥[1] 杨雅丽[1] 武光军[1] 关乃佳[1] 

机构地区：[1]南开大学新催化材料科学研究所,天津300071 [2]南开大学云南研究院,云南昆明650091

出　　处：《化学工程》2009年第12期47-50,共4页Chemical Engineering(China)

基　　金：国家重点基础研究发展计划项目(973计划)(2003CB615801);国家自然科学基金资助项目(20777039;20573059);云南省院省校合作基金项目(2005YX39)

摘　　要：在原位合成拟薄水铝石中加入酵母和海藻酸钠,搅拌并冷冻后制备固定化酵母,以甘蔗废糖蜜生产乙醇。通过复合材料固定化酵母增殖机理发现,固定化酵母数达4.1×109个/mL,批式发酵中14h消耗了90.5%的总糖;40d连续流动中,稀释率为0.100h-1时,最大载体乙醇产率为52.0g/(L.h)。SEM表征表明,该固定化酵母细胞密度高,孔道结构丰富,利于细胞的繁殖生长和物质传送。乙醇发酵过程彻底,速率快,残糖水平低,原料利用率和发酵醪乙醇质量浓度均超过传统工艺。A new kind of carrier for the immobilization yeast to produce ethanol from sugar cane molasses was made by in-situ synthetic pseudo-boehmite （α-AlOOH） mixed with yeast and Na alginate. The results show that the composite carrier has a biology capacity of 4.1 ×10^9 n/mL. 90.5% of total sugar was consumed after 14 h in the batch fermentation. The maximum carrier ethanol productivity of 52, 0 g/（ L · h） appeared at the dilution rate of 0. 100 h-1 in the 40 d continuous flow alcohol fermentation. The scanning electron microscopy （ SEM ） of the carriers reveals that the composite carrier is much more porous than α-AlOOH and Ca alginate, which facilitates the transmission of substrates and products between carriers and medium. The experiments show that the composite carrier of Al alginate-based α-AIOOH has higher carrier ethanol productivity, lower residual sugar concentration than the traditional technology, and can get higher conversion ratio of material and ethanol mass concentration.

关 键 词：拟薄水铝石 海藻酸铝 固定化酵母 甘蔗废糖蜜 燃料乙醇 复合载体 

分 类 号：TQ223.122[化学工程—有机化工]