The Techno-Economic Basis for Coproduct Manufacturing To Enable Hydrocarbon Fuel Production from Lignocellulosic Biomass
The Techno-Economic Basis for Coproduct Manufacturing To Enable Hydrocarbon Fuel Production from Lignocellulosic Biomass
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DOI：
10.1021/acssuschemeng.6b00243
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发表时间：
2016-06-01
影响因子：
8.4
通讯作者：
Beckham, Gregg T.
中科院分区：
文献类型：
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作者：
Biddy, Mary J.;Davis, Ryan;Beckham, Gregg T.
生物炼制工艺的开发依赖于技术经济分析（TEA）来确定主要的成本驱动因素，优先考虑研究方向，并通过开发详细的工艺设计来降低技术风险。在这里，我们对2000干公吨/天的木质纤维素生物炼制模型进行TEA，该模型采用两步预处理和酶解生产生物质衍生糖，随后是生物脂质生产、脂质回收和催化加氢处理，以生产可再生柴油混合物（RDB）。根据这些步骤的近期技术可行性预测，我们预测RDB可以在最低燃料销售价格（MFSP）为9.55美元/汽油加仑当量（GGE）的情况下生产，这是基于对提高脂质生产率和产量的需求，而不是目前的基准性能。考虑到产油微生物的规模限制和有氧培养以及随后的脂质提取/回收的高成本，这一成本是显着的。鉴于这一预测成本，我们开发了一种替代途径，该途径表明，如果生物质的可升级部分（在这种情况下是半纤维素衍生糖）被转移到具有足够价值和市场规模的副产品，RDB成本可以在短期内大幅降低；这里，我们以琥珀酸为例。联合生产模型预测，在保持燃料生产途径的转化和产量参数不变的情况下，MFSP为5.28美元/GGE，导致生物炼制RDB产能从24至15 MM GGE/年和0.13 MM琥珀酸/年。进一步的分析表明，除了模型中假设的近期预测之外，随着燃料和副产物系列的进一步转型改进，特别是在燃料和副产物的碳效率、燃料和副产物的回收和净化、副产物的选择和价格方面，MFSP进一步降低到2-3美元/GGE（这将与化石基碳氢化合物燃料竞争）是可能的。总体而言，该分析记录了碳氢化合物燃料和生物产品工艺途径的潜在经济效益，并强调了超越当前基准的优先研究方向，即通过产油微生物平台生产碳氢化合物燃料，同时从木质纤维素生物质中生产副产物。
Biorefinery process development relies on techno-economic analysis (TEA) to identify primary cost drivers, prioritize research directions, and mitigate technical risk for scale-up through development of detailed process designs. Here, we conduct TEA of a model 2000 dry metric ton-per day lignocellulosic biorefinery that employs a two-step pretreatment and enzymatic hydrolysis to produce biomass-derived sugars, followed by biological lipid production, lipid recovery, and catalytic hydrotreating to produce renewable diesel blendstock (RDB). On the basis of projected near-term technical feasibility of these steps, we predict that RDB could be produced at a minimum fuel selling price (MFSP) of USD $9.55/gasolinegallon-equivalent (GGE), predicated on the need for improvements in the lipid productivity and yield beyond current benchmark performance. This cost is significant given the limitations in scale and high costs for aerobic cultivation of oleaginous microbes and subsequent lipid extraction/recovery. In light of this predicted cost, we developed an alternative pathway which demonstrates that RDB costs could be substantially reduced in the near term if upgradeable fractions of biomass, in this case hemicellulose-derived sugars, are diverted to coproducts of sufficient value and market size; here, we use succinic acid as an example coproduct. The coproduction model predicts an MFSP of USD $5.28/GGE when leaving conversion and yield parameters unchanged for the fuel production pathway, leading to a change in biorefinery RDB capacity from 24 to 15 MM GGE/year and 0.13 MM tons of succinic acid per year. Additional analysis demonstrates that beyond the near-term projections assumed in the models here, further reductions in the MFSP toward $2-3/GGE (which would be competitive with fossil-based hydrocarbon fuels) are possible with additional transformational improvements in the fuel and coproduct trains, especially in terms of carbon efficiency to both fuels and coproducts, recovery and purification of fuels and coproducts, and coproduct selection and price. Overall, this analysis documents potential economics for both a hydrocarbon fuel and bioproduct process pathway and highlights prioritized research directions beyond the current benchmark to enable hydrocarbon fuel production via an oleaginous microbial platform with simultaneous coproduct manufacturing from lignocellulosic biomass.