鑒於全球暖化日益嚴重，及再生能源發電中棄風棄光現象造成能源大量浪費的問題，因此電轉氣(Power to Gas, P2G)為目前歐盟所積極推動的儲能技術。此技術以電解水來產生氫氣，藉利用水電解產生的氫氣和二氧化碳進行甲烷化反應，為了使氫氣不被浪費，甲烷化反應中常會以二氧化碳過量的方式來進行，經反應後，產物組成為二氧化碳、甲烷及乙烷。 本研究模擬探討以變壓吸附法(pressure swing adsorption, PSA)進行CO2甲烷化反應後之氣體高純度純化分離，依據文獻資料擇定以沸石13X做為吸附劑。隨後，本研究以程序模擬結合實驗設計(design of experiment, DOE)，找出以進料條件為67.9%甲烷、30%二氧化碳及2.1%乙烷時之三塔九步驟PSA程序之分離最適化操作條件，經分析後，最佳化程序可使塔頂輕產物甲烷純度95.91%、回收率97.93%，塔底重產物二氧化碳純度90.27%、回收率90.47%。 ;In view of serious global warming problem and the massive energy waste in renewable energy, power-to-gas (P2G) is currently an energy storage technology actively promoted by the European Union. The P2G technology uses green energy or off-peak residual electricity with a low-energy amphoteric membrane to electrolyze water to produce hydrogen and oxygen. In addition, the captured and desorbed high-purity carbon dioxide is hydrogenated with hydrogen into high-purity methane through a catalyst. Moreover, the methanation reaction often reacts with excess carbon dioxide. After the reaction, the gas composition is carbon dioxide, methane, ethane and a small amount of hydrogen. In this research, the pressure swing adsorption (PSA) process was applied to purify carbon dioxide and methane from the product gases from CO2 methanation. By simulation study, the adsorbent is chosen based on literature, and the sorbent parameters were calculated from experimental data of the adsorption equilibrium curve. We used 13X zeolite as adsorbent due to its high CO2/CH4 selectivity. The PSA process simulation combined with the design of experiments (DOE) is used to find out the optimal operating conditions for the separation of the three-component feed which contained 67.9% CH4, 2.1% C2H6 and 30% CO2. After analysis, the optimal operating conditions of a three-bed nine-step PSA process were obtained to produce a top product at 95.91% methane purity with 97.93 % recovery, and a bottom product at 90.27% carbon dioxide purity with 90.47 % recovery.
