Economically viable CO2 electroreduction embedded within ethylene oxide manufacturing,Energy & Environmental Science

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Economically viable CO2 electroreduction embedded within ethylene oxide manufacturing
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-2-3 , DOI: 10.1039/d0ee03310c
Magda H. Barecka _{1,

2,

3} , Joel W. Ager _{3,

4,

5,

6,

7} , Alexei A. Lapkin _{1,

2,

3,

8,

9}

Affiliation

Electrochemical conversion of CO₂ (CO2R) into fuels and chemicals can both reduce CO₂ emissions and allow for clean manufacturing in the scenario of significant expansion of renewable power generation. However, large-scale process deployment is currently limited by unfavourable process economics resulting from significant up- and down-stream costs for obtaining pure CO₂, separation of reaction products and increased logistical effort. We have discovered a method for economically viable recycling of waste CO₂ that addresses these challenges. Our approach is based on integration of a CO2R unit into an existing manufacturing process: ethylene oxide (EO) production, which emits CO₂ as a by-product. The standard EO process separates waste CO₂ from the gas stream, hence the substrate for electroreduction is available at an EO plant at no additional cost. CO₂ can be converted into an ethylene-rich stream and recycled on-site back to the EO reactor, which uses ethylene as a raw material, and also the anode product (oxygen) can be simultaneously valorized for the EO production reaction. If powered by a renewable electricity source, the process will significantly (ca. 80%) reduce the CO₂ emissions of an EO manufacturing plant. A sensitivity analysis shows that the recycling approach can be economically viable in the short term and that its payback time could be as low as 1–2 years in the regions with higher carbon taxes and/or with access to low-cost electricity sources.

中文翻译：

嵌入环氧乙烷生产中的经济可行的二氧化碳减排

将CO ₂（CO2R）电化学转化为燃料和化学物质既可以减少CO ₂排放，又可以在可再生能源发电显着扩大的情况下进行清洁制造。然而，由于获得纯CO _2的大量上游和下游成本，反应产物的分离和增加的后勤工作，当前的大规模工艺部署受到不利的工艺经济学的限制。我们发现了一种经济可行的废CO ₂循环利用的方法，可以应对这些挑战。我们的方法基于将CO2R单元集成到现有的制造过程中：环氧乙烷（EO）生产，其排放CO ₂作为副产品。标准的EO工艺将废CO ₂从气流中分离出来，因此用于电还原的基材可在EO工厂获得，而无需额外费用。可以将CO ₂转化为富含乙烯的物流，并就地循环回到EO反应器，该反应器使用乙烯作为原料，同时可以为EO生产反应增值阳极产品（氧气）。如果使用可再生能源供电，则该过程将显着（约80％）减少CO ₂EO制造工厂的排放。敏感性分析表明，回收方法短期内在经济上可行，在碳税较高和/或可使用低成本电源的地区，回收期可低至1-2年。

更新日期：2021-02-15

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