Dual-reflux pressure swing adsorption (DR-PSA) is a state-of-art adsorption technology claiming to achieve both high product purity and recovery. However, its performance is inevitably limited by the gas mixing problem at the feed inlet position in adsorption columns, where a discontinuity in the columns' axial concentration profiles disturbs the separation. Here, we developed a dynamic-feed DR-PSA (DF-DR-PSA) process to solve the mixing problem and obtain better separation performance by introducing multiple feed inlets along the column. The DF-DR-PSA process was demonstrated by enrichment methane (CH₄) from a binary gas mixture containing 2.4 mol.% CH₄ in nitrogen (N₂) using activated carbon material. Non-isothermal dynamic models were constructed to investigate the effects of operating parameters on the separation performance. The results showed the DF-DR-PSA process achieved both higher methane purity (53.5% vs. 47.5%) and recovery (81.1% vs. 72.2%) over the conventional DR-PSA process at the same energy consumption.

中文翻译：

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用新型动态进料双回流变压吸附工艺捕获稀甲烷

双回流变压吸附 (DR-PSA) 是一种最先进的吸附技术，声称可实现高产品纯度和回收率。然而，它的性能不可避免地受到吸附塔进料口位置的气体混合问题的限制，其中塔轴向浓度分布的不连续性会干扰分离。在这里，我们开发了一种动态进料 DR-PSA (DF-DR-PSA) 工艺，通过沿塔引入多个进料入口来解决混合问题并获得更好的分离性能。的DF-DR-PSA过程由富集甲烷（CH证明₄由含有2.4摩尔％CH二元气体混合物）₄，在氮气（N ₂) 使用活性炭材料。构建非等温动态模型来研究操作参数对分离性能的影响。结果表明，在能耗相同的情况下，DF-DR-PSA 工艺比传统 DR-PSA 工艺实现了更高的甲烷纯度（53.5% 对 47.5%）和回收率（81.1% 对 72.2%）。