Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA.
Bioresour Technol. 2011 Jun;102(12):6680-6. doi: 10.1016/j.biortech.2011.03.040. Epub 2011 Mar 21.
Two corn preparation methods, rollermill flaking and hammermill grinding, were compared for efficient processing of corn into ethanol by granular starch hydrolysis and simultaneous fermentation by yeast Saccharomyces cerevisiae. Corn was either ground in a hammermill with different size screens or crushed in a smooth-surfaced rollermill at different roller gap settings. The partitioning of beer solids and size distribution of solids in the thin stillage were compared. The mean particle diameter d(50) for preparations varied with set-ups and ranged between 210 and 340 μm for ground corn, and 1180-1267 μm for flaked corn. The ethanol concentrations in beer were similar (18-19% v/v) for ground and flaked preparations, however, ethanol productivity increased with reduced particle size. Roller versus hammermilling of corn reduced solids in thin stillage by 28%, and doubled the volume percent of fines (d(50) ∼ 7 μm)in thin stillage and decreased coarse (d(50) ∼ 122 μm) by half compared to hammermilling.
两种玉米预处理方法，辊式磨片压片和锤片粉碎机粉碎，被用于通过颗粒状淀粉水解和酵母酿酒酵母同步发酵高效生产乙醇。玉米通过不同尺寸筛网的锤片粉碎机粉碎，或者在不同轧辊间隙的光滑表面辊式磨上压碎。比较了酒糟中啤酒固形物的分配和固形物的粒度分布。d(50)的平均粒径因设备和设置而异，粉碎玉米的粒径在 210-340μm 之间，压片玉米的粒径在 1180-1267μm 之间。粉碎和压片玉米的啤酒中乙醇浓度相似（18-19% v/v），但是，乙醇生产率随粒径减小而增加。与锤片粉碎机相比，玉米的辊式磨片压片减少了酒糟中固体含量 28%，并且使酒糟中细颗粒（d(50) ∼ 7μm）的体积百分比增加了一倍，而粗颗粒（d(50) ∼ 122μm）减少了一半。
