The use of paraffin-selective adsorbents in separation of paraffin/olefin pairs has been recently demonstrated as a sustainable platform for recovering a highly pure olefin product directly from the adsorption step. These materials allow for development of a less expensive and economically attractive technology for olefin/paraffin separation. Herein, we report formulation of paraffin-selective adsorbents into monolithic contactors and evaluation of their adsorptive performance in ethane/ethylene separation. More specifically, Ni(bdc)(ted)_0.5 and ZIF-7 were used as ethane-selective adsorbents for development of monoliths via 3D printing. Their formulation was optimized according to printability of the extruded paste and mechanical stability of the final monolith piece. Through equilibrium and dynamic adsorption experiments, it was demonstrated that formulation of the adsorbents into monoliths does not adversely affect their separation efficiency, and the monoliths exhibit uptakes proportional to the adsorbent loading and comparable to those of their powder analogues. Application of the ideal adsorption solution theory method predicted C₂H₆/C₂H₄ selectivities in the ranges 1.9–11.8 and 1.2–2.0 for ZIF-7 and Ni(bdc)(ted)_0.5 monoliths, respectively. The findings of this study highlight the feasibility of 3D printing as a facile and cost-effective approach in shaping paraffin-selective adsorbents into practical contactors.

中文翻译：

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在3D打印的乙烷选择性整料上吸附乙烷和乙烯

最近已证明在分离石蜡/烯烃对中使用石蜡选择性吸附剂是直接从吸附步骤回收高纯度烯烃产物的可持续平台。这些材料允许开发用于烯烃/石蜡分离的较便宜且经济上有吸引力的技术。在这里，我们报告石蜡选择性吸附剂在整体式接触器中的配方及其对乙烷/乙烯分离的吸附性能的评估。更具体地说，Ni（bdc）（ted）_0.5ZIF-7和ZIF-7用作乙烷选择性吸附剂，用于通过3D打印显影整料。根据挤出糊料的可印刷性和最终整料片的机械稳定性优化了它们的配方。通过平衡和动态吸附实验证明，将吸附剂配制成整料不会对分离效率产生不利影响，并且整料表现出与吸附剂负载成比例的吸收率，并且与粉末状类似物的吸收率相当。理想吸附溶液理论方法的应用预测ZIF-7和Ni（bdc）（ted）_0.5对C ₂ H ₆ / C ₂ H _4的选择性在1.9-11.8和1.2-2.0范围内分别。这项研究的结果突出了3D打印作为将石蜡选择性吸附剂成型为实用接触器的便捷且经济高效的方法的可行性。