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Records with Keyword: Butanol
Assessment of feasibility and benefits of replacing bioethanol with biobutanol in the transportation fuels industry
Merissa Wiebe, Thomas Alan Adams II
November 21, 2018 (v1)
Subject: Energy Policy
Keywords: Biobutanol, Butanol, Ethanol, Transportation Fuels
In recent years there has been a strong drive towards transitioning the transportation fuels market to a sustainable alternative. Biofuels has emerged as one of the solutions and is receiving a great deal of focus in research, industry, and politics. Ethanol is currently the most popular biofuel, but butanol has been acknowledged as a superior alternative in several regards. In this paper, the chemical and physical properties of butanol are compared to ethanol and gasoline. In addition, the feasibility of a butanol-based economy is assessed in terms of available supply, compatibility in spark ignition engines in terms of performance and emissions, and ability to easily transport, store, and dispense the fuel. Life cycle assessments of biobutanol are also reviewed, which ultimately suggest that butanol has the potential to be a sustainable alternative. However, the yield of biobutanol production via ABE fermentation, the primary process currently utilized to produce the fuel, is low. Ad... [more]
Techno-economic comparison of Acetone-Butanol-Ethanol fermentation using various extractants
Giancarlo Dalle Ave, Thomas A. Adams II
June 12, 2018 (v1)
Keywords: Acetone, Butanol, Cost of CO2 Emissions Avoided, Ethanol, Extraction, Fermentation, Technoeconomic Analysis
This work compares various chemicals for use as extractants in second-generation Acetone-Butanol-Ethanol fermentation on economic and environmental bases. Both non-toxic and toxic extractants are considered in this study. The combinative extractive-distillation separation process was modelled using a combination of Microsoft Excel 2013, MATLAB 2015 and Aspen Plus v8.8. Separation trains were designed and optimized for each extractant to best take advantage of extractant properties. Upstream units considered in this analysis include: biomass (switchgrass) solids processing, biomass pre-treatment and saccharification, and fermentation. Downstream processes considered include utility generation and wastewater treatment. The cost of CO2 equivalent emissions avoided (CCA) was used as the metric to compare the environmental impact of each process as compared to conventional petroleum-based gasoline. The economic and environmental best extractant is shown to be 2-ethyl-hexanol with a minimum... [more]
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