TY - JOUR

T1 - A Technoeconomic Model Coupled with HYSYS to Analyze the Electroreduction of Carbon Dioxide to Ethanol

AU - Pickett, Isabelle

AU - Vo, Trang

AU - Wu, Ho Yan

AU - Expósito, Antonio José

N1 - Acknowledgements
The authors are grateful to the Department of Chemical Engineering at
the University of Bath for providing the funding necessary to carry out this
investigation. The authors acknowledge AspenTech for allowing the publication of this research. References and screen images from Aspen HYSYS
were used and reprinted with permission from Aspen Technology, Inc. AspenTech, Aspen HYSYS, and the AspenTech leaf logo are trademarks of
Aspen Technology, Inc. All rights reserved.
Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.

PY - 2023/2/12

Y1 - 2023/2/12

N2 - This research develops a technoeconomic analysis to study the profitability of ethanol production from CO2 electroreduction. A HYSYS simulation is used to calculate the separation costs, a challenge in previous models available in literature. The profitability of a 10 000 kg per day CO2 electroreduction plant to produce ethanol is studied. An optimization of the pressure swing adsorber and distillation tower, which greatly influence the total cost of the plant (≈20% of total cost), is carried out, obtaining a total cost of separation of £1.94 (Formula presented.) 106. The study demonstrates that reducing the voltage applied to values around 0.5 V, i.e., by increasing the pH up to 12 makes the process economically feasible with a current density over 15 mA cm−2. It also shows that the process is economically feasible using a current density of 5 mA cm−2 if the electricity cost from renewable sources drops to 2.0 (Formula presented.) 10−2 £ kWh−1. Finally, it is proved that if catalyst stability is not considered, some catalysts currently available in the literature can be used with a positive economic income. The results of this research show that the industrial electroreduction of ethanol can be feasible and can attract interest in the industrial adoption of the technology.

AB - This research develops a technoeconomic analysis to study the profitability of ethanol production from CO2 electroreduction. A HYSYS simulation is used to calculate the separation costs, a challenge in previous models available in literature. The profitability of a 10 000 kg per day CO2 electroreduction plant to produce ethanol is studied. An optimization of the pressure swing adsorber and distillation tower, which greatly influence the total cost of the plant (≈20% of total cost), is carried out, obtaining a total cost of separation of £1.94 (Formula presented.) 106. The study demonstrates that reducing the voltage applied to values around 0.5 V, i.e., by increasing the pH up to 12 makes the process economically feasible with a current density over 15 mA cm−2. It also shows that the process is economically feasible using a current density of 5 mA cm−2 if the electricity cost from renewable sources drops to 2.0 (Formula presented.) 10−2 £ kWh−1. Finally, it is proved that if catalyst stability is not considered, some catalysts currently available in the literature can be used with a positive economic income. The results of this research show that the industrial electroreduction of ethanol can be feasible and can attract interest in the industrial adoption of the technology.

KW - CO electroreduction

KW - ethanol

KW - HYSYS

KW - separation costs

KW - technoeconomic models

UR - http://www.scopus.com/inward/record.url?scp=85148020633&partnerID=8YFLogxK

U2 - 10.1002/adts.202200782

DO - 10.1002/adts.202200782

M3 - Article

AN - SCOPUS:85148020633

SN - 2513-0390

JO - Advanced Theory and Simulations

JF - Advanced Theory and Simulations

M1 - 2200782

ER -