Zheng Jun, Rehmann Lars
Department of Chemical and Biochemical Engineering, University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada.
Int J Mol Sci. 2014 Oct 20;15(10):18967-84. doi: 10.3390/ijms151018967.
Bioconversion of lignocellulosic biomass to bioethanol has shown environmental, economic and energetic advantages in comparison to bioethanol produced from sugar or starch. However, the pretreatment process for increasing the enzymatic accessibility and improving the digestibility of cellulose is hindered by many physical-chemical, structural and compositional factors, which make these materials difficult to be used as feedstocks for ethanol production. A wide range of pretreatment methods has been developed to alter or remove structural and compositional impediments to (enzymatic) hydrolysis over the last few decades; however, only a few of them can be used at commercial scale due to economic feasibility. This paper will give an overview of extrusion pretreatment for bioethanol production with a special focus on twin-screw extruders. An economic assessment of this pretreatment is also discussed to determine its feasibility for future industrial cellulosic ethanol plant designs.
与由糖或淀粉生产的生物乙醇相比,将木质纤维素生物质生物转化为生物乙醇已显示出环境、经济和能源方面的优势。然而,提高酶可及性和改善纤维素消化率的预处理过程受到许多物理化学、结构和组成因素的阻碍,这使得这些材料难以用作乙醇生产的原料。在过去几十年中,已经开发出多种预处理方法来改变或消除对(酶)水解的结构和组成障碍;然而,由于经济可行性,其中只有少数几种可用于商业规模。本文将概述用于生物乙醇生产的挤压预处理,特别关注双螺杆挤出机。还讨论了这种预处理的经济评估,以确定其在未来工业纤维素乙醇工厂设计中的可行性。