The use of carbon dioxide in microbial electrosynthesis: Advancements, sustainability and economic feasibility
The use of carbon dioxide in microbial electrosynthesis: Advancements, sustainability and economic feasibility
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DOI：
10.1016/j.jcou.2017.01.027
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发表时间：
2017-03-01
影响因子：
7.7
通讯作者：
Velasquez-Orta, Sharon B.
中科院分区：
文献类型：
--
作者：
Christodoulou, Xenia;Okoroafor, Tobechi;Velasquez-Orta, Sharon B.
本研究考察了微生物电合成（MES）领域的最新进展，并报告了五种替代化合物（甲酸、乙酸、丙酸、甲醇和乙醇）生产的独特可持续性和经济评估。以年产1000吨的化工厂为模型，对不同的化工生产条件进行了比较。三个可持续性指标；净能量消耗（NEC）、能量增益（EG）和全球变暖比（GWR）；伴随着三个经济指标：生产成本，回收期和贴现现金流回报率。NEC分析显示，MES反应器和整流装置需要大量能量。前者是由于将二氧化碳合成成更长的链所需的能量，后者是由于合成过程中形成的水分子增加。EG值表明，MES生产甲酸和甲醇的效率低于常规工艺。研究表明，MES合成甲醇、乙醇和甲酸所需的二氧化碳比生产出来的要多。经济分析表明，甲酸和乙醇的投资回收期较长，为15年。然而，只有甲酸（0.30磅/公斤）和乙醇（0.88磅/公斤）的生产成本具有市场竞争力。此外，与行业的最低要求（11.60%）相比，甲酸（21%）和乙醇（14%）的回报率较高，使这些产品具有经济吸引力。我们的研究结果揭示了在可持续和经济上可行的化学生产过程中使用和扩大MES的见解。(C)2017年作者。Elsevier Ltd.出版。
This study examines the latest advancements in the field of Microbial ElectroSynthesis (MES) and reports a unique sustainability and economic assessment for the production of five alternative compounds (formic, acetic, propionic acids; methanol and ethanol). Different chemical production conditions were compared by modelling a 1000 t per year production plant. Three sustainability indicators; net energy consumption (NEC), energy gain (EG) and global warming ratio (GWR), were used; along with three economic indicators: production cost, pay-back period and discounted cash flow rate of return. NEC analysis revealed substantial energy requirements in the MES reactor and rectification unit. The former due to the energy required to synthesise CO2to longer chains and the later due to increased water molecules formed during synthesis. EG values suggested that producingformic acid and methanol using MES were lower than conventional processes. MES was shown to use more carbon dioxide for methanol, ethanol and formic acid synthesis than those produced. The economic analysis showed that formic acid and ethanol had a long pay-back period of 15 years. However, production costs were found to be competitive with the market only for formic acid (0.30 pound/ kg) and ethanol (0.88 pound/ kg). Moreover, high returns were evaluated for formic acid (21%) and ethanol (14%) compared to the minimum requirements of the industry (11.60%) making these products economically attractive. Our findings reveal insights about the use and scale up of MES for a sustainable and economically viable chemical production process. (C)2017 The Authors. Published by Elsevier Ltd.