本研究利用變壓吸附法純化氣化合成氣經富氧燃燒及除水之氣體中二氧化碳，高純度二氧化碳之價值在於其不需經過轉化，可直接作為溶劑與工作/熱傳流體(Working/heat transfer fluid)之用，亦可用於焊接、急速冷凍、設備清洗、醫療、製程反應、晶圓、LED、電子面板等用途，此外，將二氧化碳作為進料，藉由轉化程序，可用以生產化工、生化及電化學產業所需之具有經濟價值之化學品。 合成氣之組成為氫氣、一氧化碳、二氧化碳、甲烷、水及少量的氮氣、氬氣，經過富氧燃燒及除水後，產出約為95%~97.4%二氧化碳濃度氣體及少量氮氣、氬氣，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。 最後採用四塔二十四步驟及四塔二十步驟變壓吸附程序進行模擬，藉由探討儲存槽位置、recycle程序之有無及不同的操作變因以尋求最適化操作條件，以無儲存槽附加recycle之四塔二十步驟變壓吸附程序，進料壓力5 atm，塔長105 cm，真空壓力0.238 atm、高壓吸附231秒，同向減壓129秒，抽真空486秒，平衡時間204秒，溫度338.14 K為最佳操作條件，其塔底二氧化碳濃度達99.99994%，回收率9.81%。 ;This research studies concentrating carbon dioxide from the syngas of a gasifier after oxy-fuel combustion and dehydration by pressure swing adsorption (PSA) process, so that the concentrated carbon dioxide can be captured and stored to reduce greenhouse gas emission. Zeolite 13X is used in this study. In the beginning of this study, the experimental adsorption isotherm data were regressed to obtain the parameters of Langmuir-Freundlich isotherm equation. Then the k value of linear driving force (LDF) model was calculated by theory and verified by breakthrough curve and desorption experiment. Then we verified the simulation program by comparison with the data of a single-bed four-step process experiment. The agreement is fine. At the end of this study, four-bed twenty-four-step and four-bed twenty-step PSA process for syngas after oxyfuel combustion and dehydration (95% CO2, 5%N2) will be studied to find the optimal operating conditions. The optimal operating conditions are feed pressure 5.00atm, vacuum pressure 0.238atm, adsorption time 231s, cocurrent depressurizaton time 129s, vacuum time 486s, pressurization equilibrium time 204s, temperature 338.14K. The simulation results of optimal operating conditions are 99.99994% purity and 9.81% recovery of carbon dioxide at bottom product of four-bed twenty-step PSA process without tank and with recycle.
