透過結合費托合成與逆水氣轉化反應來進行碳捕捉與利用被視為一種極具前瞻性碳捕捉路徑，此反應首先透過逆水氣轉化反應將二氧化碳轉化為一氧化碳，隨後再將其轉化為烯烴類產物。本研究之主要目標為使用此種複合式反應將二氧化碳捕捉為低碳數(二至四碳)之烯烴類碳氫化合物。此研究中之嚴謹製程設計與分析一共包含反應段設計、二氧化碳段設計、低溫精餾段設計與優化和經濟分析四個重要階段。首先，反應段會完成上述反應並達成75.45%之二氧化碳轉換率，其中有82.79%之二氧化碳將被轉換為二至四碳之烯烴類碳氫化合物。隨後，二氧化碳吸收段將會使用乙烯胺系統搭配分子篩來進行二氧化碳的捕捉與再利用，研究結果顯示於乙烯胺系統中每噸的二氧化碳將會需要3.63千兆焦耳之能量，而分子篩則需要7.06千兆焦耳用於每噸之二氧化碳捕捉，故本研究認為連續式碳捕捉系統於大型製程的表現上優於批次系統。再來，低溫精餾段則會透過三座塔將反應物分成乙丙烯複合、丁烯與富氫氣回收之三股物流。為了減少支出，富氫氣之回收流將會以直接燃燒與吸附後燃燒兩種方式進行回收再利用。最終，透過不同的優化模型將整廠模擬進行優化，並以不同的氫氣與二氧化碳進行經濟與環境分析。分析結果顯示，此製程透過現今已工業化之程序，最佳表現可透過生產每噸之產物捕捉3.45噸之二氧化碳，而其最低之售出價格為每噸之產物1.178千美元略低於市場價格。此外，若使用之氫氣每噸排放少於6.82噸之二氧化碳，此製程便可達到淨減碳之成效。最終透過敏感度分析可發現，若要加強此製程於減碳力和經濟上之競爭力，確保使用之氫氣來源為綠氫和大幅度將低綠氫之價格為其中最重要之目標。

The combination of FT synthesis and the reversed water gas shifting reaction, which initiates the reaction with carbon dioxide (CO2) and hydrogen (H2), is considered one of the most significant methods for carbon capture and utilization, aiming to achieve net zero carbon emissions by 2050. This article presents a comprehensive investigation into the process design of the FT synthesis for light olefins synthesis. Two distinct scenarios are constructed, encompassing the reaction section, CO2 absorption section, and cryogenic distillation section, while after optimization the process achieves a remarkable carbon efficiency of 99.6%. Furthermore, a detailed techno-economic analysis and CO2 equivalent calculation are conducted to evaluate the economic and environmental aspects. Through twenty-five permutations of different H2 and CO2 sources, the results reveal the lowest product unit price and the best decarbonization capability, yielding 1.178 kUSD/Ton and -3.45 Ton-CO2/Ton-C2-C4 olefin, respectively, using current commercialized technology. Moreover, a sensitivity test highlights that H2 is the most influential factor affecting both the decarbonization ability and economic competitiveness of this process in the current scenario. Additionally, it is observed that if the CO2 emissions caused by H2 can be reduced to less than 6.89 Ton-H2/Ton-CO2, a net reduction in CO2 emissions can be achieved through this process.

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