Evaluating the impact of ammonia fiber expansion (AFEX) pretreatment conditions on the cost of ethanol production
Evaluating the impact of ammonia fiber expansion (AFEX) pretreatment conditions on the cost of ethanol production
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DOI：
10.1016/j.biortech.2010.08.058
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发表时间：
2011-01-01
影响因子：
11.4
通讯作者：
Dale, Bruce
中科院分区：
文献类型：
--
作者：
Bals, Bryan;Wedding, Chris;Dale, Bruce
氨纤维膨胀（AFEX）预处理是一种基于氨的工艺，用于改善木质纤维素生物质对酶攻击的敏感性。四个参数-氨负荷，水负荷，反应温度和停留时间-可以变化，以优化AFEX预处理。这些参数对乙醇生产过程经济性的影响进行了研究，使用领先的生物炼制模型。氨负荷和停留时间对乙醇生产的经济性影响最大，主要是由于冷冻水冷凝器的处理成本和AFEX反应器的资本成本。水负荷和反应温度对工艺经济性的影响不大。此外，预处理条件对补充氨需求的影响进行了实验探索，其范围为15至25 g氨/kg生物质。总的来说，在850吨/天的炼油厂中，预处理条件可以使乙醇生产成本改变高达35美分/加仑乙醇。通过将从该白杨模型获得的结果与乙醇生产和补充氨回收的实验结果相关联，该研究可用于创建AFEX预处理的经济最佳值，而不是简单地最大化可发酵糖的生产。(C)2010爱思唯尔有限公司版权所有。
Ammonia fiber expansion (AFEX) pretreatment is an ammonia-based process for improving the susceptibility of lignocellulosic biomass to enzymatic attack. Four parameters - ammonia loading, water loading, reaction temperature, and residence time - can be varied in order to optimize AFEX pretreatment. The effect of these parameters on process economics of ethanol production was studied using a leading biorefinery model. Ammonia loading and residence time had the greatest impact on the economics of ethanol production, primarily due to processing costs for the chilled water condenser and the capital cost of the AFEX reactor. Water loading and reaction temperature had only modest impact on process economics. In addition, the impact of pretreatment conditions on makeup ammonia requirements was explored experimentally, which ranged from 15 to 25 g ammonia/kg biomass. Overall, pretreatment conditions can change the costs of ethanol production by up to 35 cents per gallon ethanol in an 850 ton/day refinery. By linking the results obtained from this Aspen model to experimental results for ethanol production and makeup ammonia recovery, this study can be used to create an economic optimum for AFEX pretreatment in contrast with simply maximizing fermentable sugar production. (C) 2010 Elsevier Ltd. All rights reserved.