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Youness El Fouih and Chakib Bouallou / Energy Procedia 37 (2013) 6679 – 6686 6685 already industrialized and then have been optimized at all levels to produce ethanol at a lower price. This difference in cost price does not mean that this way of ethanol sustainable production should be ignored. On the contrary, more research effort should be put to optimize energy and operational parameters which will make this process more competitive. For more precise economic assessment of this process, we must take into account some important externalities aspects. The most important externality is reducing dependence on energy imports, which is today in France about 50% and is expected to increase to 70% in 2030 [14]. We can therefore predict a significant reduction of the country's energy dependence due to the industrialization of this process on a large scale. For example, production of bioethanol generates more than process. Another important aspect that should be taken into account is the carbon dioxide consumption, which allows the possibility to sell carbon dioxide quotas (allowances) and reduce consequently ethanol price cost. Table 3: Main economic assessment assumptions Annual production Investment cost Ethanol synthesis unit Electrolysis unit CO2 conversion rate H2O conversion rate Operating costs Electricity price Thermal energy Demineralized water CO2 Capture Catalysts Interest rate Life time of ethanol synthesis unit Life time of electrolysis unit Plant availability Ethanol cost price 5. Conclusion 165 000 t of Ethanol 28 k$/t of Ethanol [13] 4000 $/m2 cell area [14] 95% (8) 95% (8) 42 $/MWh 15 $/MWh 0.7 $/m3 24$/tCO2 743 $/t of Ethanol [3, 13] 8% 20 years [2] 5 years [2] 60% (8) 1.1$perkg The main objective of this study is to explore one of the possible pathways of carbon dioxide recycling to produce chemical compounds. The studied process consists of two main steps. The first one is the high temperature co-electrolysis of CO2 and water vapor, using solid oxide electrolysis cells (SOEC), to produce the syngas (H2 + CO). To determine the gas outlet conditions of the SOEC we used a simplified mathematical model of the co-electrolysis equilibrium. The second step is the ethanol synthesis from syngas in a catalytic reaction. The considered catalyst is Rh based catalyst promoted with vanadium, which have the best selectivity for ethanol and oxygenates. process was designed for ethanol production rate of 60 000 t/year. Simulation results showed that we needPDF Image | Recycling of carbon dioxide to produce ethanol
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