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A comparative thermodynamic study on the CO2 conversion in the synthesis of methanol and of DME

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  • Ateka, Ainara
  • Pérez-Uriarte, Paula
  • Gamero, Mónica
  • Ereña, Javier
  • Aguayo, Andrés T.
  • Bilbao, Javier

Abstract

A thermodynamic approach of the synthesis processes of methanol and of DME from H2 + CO + CO2 has been conducted, in order to compare the feasibility of incorporating CO2 in the feed of both processes. The effects of reaction temperature (200–400 °C), pressure (10–100 bar) and CO2/(CO + CO2) ratio in the feed on the CO2 conversion, yield and selectivity of oxygenates (methanol + DME), and heat released in each process have been studied. CO2 conversion is strongly dependent on the CO2 content in the feed and is higher in the DME synthesis for high CO2 concentration values in the feed (CO2/(CO + CO2) > 0.75). The increase of reaction temperature and the increase of the CO2 content in the feed have an unfavorable effect on the oxygenate yield and selectivity, while the increase of reaction pressure has a favorable effect. Comparing both processes, higher oxygenate yield and selectivity values are obtained in the synthesis of DME, which is more relevant for CO2 rich feeds. Moreover, feeding CO2 lessens the exothermic nature of both processes which is a positive effect for protecting the metallic function of the catalyst, as the formation of hot spots is avoided.

Suggested Citation

  • Ateka, Ainara & Pérez-Uriarte, Paula & Gamero, Mónica & Ereña, Javier & Aguayo, Andrés T. & Bilbao, Javier, 2017. "A comparative thermodynamic study on the CO2 conversion in the synthesis of methanol and of DME," Energy, Elsevier, vol. 120(C), pages 796-804.
    • Handle: RePEc:eee:energy:v:120:y:2017:i:c:p:796-804
    DOI: 10.1016/j.energy.2016.11.129
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    References listed on IDEAS

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    1. Luu, Minh Tri & Milani, Dia & Sharma, Manish & Zeaiter, Joseph & Abbas, Ali, 2016. "Model-based analysis of CO2 revalorization for di-methyl ether synthesis driven by solar catalytic reforming," Applied Energy, Elsevier, vol. 177(C), pages 863-878.
    2. Chen, Wei-Hsin & Hsu, Chih-Liang & Wang, Xiao-Dong, 2016. "Thermodynamic approach and comparison of two-step and single step DME (dimethyl ether) syntheses with carbon dioxide utilization," Energy, Elsevier, vol. 109(C), pages 326-340.
    3. Chen, Hsi-Jen & Fan, Chei-Wei & Yu, Chiou-Shia, 2013. "Analysis, synthesis, and design of a one-step dimethyl ether production via a thermodynamic approach," Applied Energy, Elsevier, vol. 101(C), pages 449-456.
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    8. Ateka, Ainara & Portillo, Ander & Sánchez-Contador, Miguel & Bilbao, Javier & Aguayo, Andres T., 2021. "Macro-kinetic model for CuO–ZnO–ZrO2@SAPO-11 core-shell catalyst in the direct synthesis of DME from CO/CO2," Renewable Energy, Elsevier, vol. 169(C), pages 1242-1251.

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