This work provides the conceptual design of a pressure/vacuum swing adsorption cycle for recovering ethane from the residue gas stream (a mostly methane stream) using Na-ETS-10 as the adsorbent. The conceptual design for treating a stream with 2.4% ethane (and the rest methane) evolved from a simple 4-step cycle to more complex configurations which were able to simultaneously improve the ethane purity and recovery. Feed temperature played a key role in the cycle performance in terms of purity and recovery. The minimization of the recompression work of the light product (methane) was achieved by proposing a cycle design which includes a heavy reflux step at high pressure and a further pressure equalization step. Purity values up to 88% ethane with recoveries of 95% and productivities higher than 0.4 mol ethane/ms were quantified through the optimization of the operating conditions for the reduced energy-cost adsorption cycle suggesting an alternative for ethane recovery in gas processing plants.

中文翻译：

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使用Na-ETS-10从残余气流中吸附回收乙烷的概念设计


这项工作提供了变压/真空吸附循环的概念设计，用于使用 Na-ETS-10 作为吸附剂从残余气流（主要是甲烷流）中回收乙烷。用于处理含有 2.4% 乙烷（以及其余甲烷）的物流的概念设计从简单的 4 步循环演变为能够同时提高乙烷纯度和回收率的更复杂的配置。进料温度对纯度和回收率方面的循环性能起着关键作用。通过提出包括高压重回流步骤和进一步压力平衡步骤的循环设计，实现了轻质产物（甲烷）的再压缩功的最小化。通过优化操作条件以降低吸附循环的能源成本，乙烷纯度高达 88%，回收率为 95%，生产率高于 0.4 mol 乙烷/ms，这表明了天然气加工厂乙烷回收的替代方案。