本研究利用變壓吸附法回收水煤氣反應後合成氣中二氧化碳，將二氧化碳濃縮並加以封存，根據美國能源部報告書之封存標準為二氧化碳濃度90%、回收率90%，如此可減少二氧化碳之排放，以避免溫室氣體對環境的持續惡化。 合成氣的進氣組成為41.4%二氧化碳、1.3%一氧化碳和57.3%氫氣，本研究使用UOP 13X沸石作為吸附劑，以Langmuir-Freundlich為模型迴歸吸附劑對各成份氣體的之等溫平衡吸附曲線以取得各項參數，利用理論計算線性驅動力質傳係數用於程序模擬，並與突破曲線實驗、脫附實驗及單塔四步驟程序實驗結果進行驗證，證明程式的可靠度。 最後採用雙塔六步驟變壓吸附程序進行模擬，藉由探討不同的操作變因以尋求最適化操作條件並嘗試提高溫度，以進料壓力3.95 atm，塔長110 cm，真空壓力0.05 atm、高壓吸附160秒，同向減壓10秒，抽真空130秒，平衡時間5秒，溫度393 K為最終操作條件，其塔底二氧化碳濃度達95.3%，回收率97.6%，預期可作為小型試驗工廠之操作條件。 ;This research studies the separation and concentraion of carbon oxide from syngas after water gas shift reaction by pressure swing adsorption (PSA) process. According to the NETL report , the compositions of syngas are 41.4% carbon dioxide ,1.3% carbon oxide and 57.3% hydrogen. The commercialized UOP 13X zeolite is used as adsorbent in this study. First of all, Langmuir-Freundlich isotherm equation is uesd to regress the isotherm data to obtain the parameters of CO2, N2, CO, H2. The linear driving force (LDF) model were calculated by theory. In order to test the reliability of the simulation program, we also compare the simulation program with breakthrough curve , desorption curve experiment and the results of a single-bed four-step process experiments. Finally, we employ dual-bed six-step PSA process for syngas feed to find the optimal operating conditions and try to rise temperature. The optimal operating conditions can be obtained by assessing different operating variables. The results of final conditions are 95.3% purity and 97.6% recovery of CO2 in bottom product.
