As global warming intensifies, it has become urgent to reduce greenhouse gas emissions. In this work, an adsorption–hydration method was employed to separate carbon dioxide (CO₂) from simulated flue gas by dispersing 1.0 mol % aqueous tetrahydrofuran solution in activated carbon, which resulted in the formation of hydrates. The hydrate phase equilibrium data was measured for determining the appropriate operating conditions. Four activated carbons (1^#, 2^#, 3^#, and 4^#) with different particle sizes were used as dispersion media under the condition of the same water content. Wet activated carbon 2^# (50.0 wt % water content) showed the best performance. After separation, the CO₂ concentration in equilibrium gas phase decreased from 20.86 to 3.07 mol %, and its recovery reached 90.35% at 274.15 K and 2.302 MPa. Then, the effects of water content and initial gas–solid ratio were examined. The results demonstrated that the variations in water content within the range 20.81–60.43 wt % had almost no effect on the adsorption process at 274.15 K and an initial pressure of 3.5 MPa. However, excess water lowered the hybrid separation efficiency. At a certain water content, there existed an optimum initial gas–solid ratio, which was favorable for CO₂ recovery. The recycling of wet activated carbons was conducted, and the results indicated that their working capacities did not change after recycling. This study contributes to better understanding of CO₂ capture from flue gas with an adsorption–hydration method and also offers the optimization of an adsorption–hydration process.

中文翻译：

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吸附水化法从模拟烟气中捕集CO _2的实验研究

随着全球变暖加剧，减少温室气体排放已迫在眉睫。在这项工作中，采用吸附水合方法，通过将1.0 mol％的四氢呋喃水溶液分散在活性炭中，从模拟烟道气中分离出二氧化碳（CO ₂），从而形成水合物。测量水合物相平衡数据以确定合适的操作条件。在相同含水量的条件下，将四种具有不同粒径的活性炭（1 ^＃，2 ^＃，3 ^＃和4 ^＃）用作分散介质。湿式活性炭2 ^＃（水含量为50.0 wt％）显示出最佳性能。分离后，CO平衡气相中的₂浓度从20.86降至3.07 mol％，在274.15 K和2.302 MPa时其回收率达到90.35％。然后，检查了水分含量和初始气固比的影响。结果表明，水分含量在20.81–60.43 wt％范围内变化对274.15 K和3.5 MPa的初始压力下的吸附过程几乎没有影响。但是，过量的水降低了杂交分离效率。在一定的水含量下，存在最佳的初始气固比，这有利于CO _2的回收。进行了湿式活性炭的回收，结果表明回收后它们的工作能力没有变化。这项研究有助于更好地了解CO ₂ 通过吸附-水合方法从烟气中捕获，还提供了吸附-水合过程的优化。