Abstract

Technologies of membrane-based gas separation can be integrated into existing industrial processes for low-temperature helium recovery from natural gas at the stages of crude helium separation from the N₂/He mixture and its purification. The effectiveness of these processes is most affected by the properties of the materials from which the membrane is made. Due to their unique properties, metal-organic framework are promising materials for use in gas separation. In the present work, both the Monte Carlo and equilibrium molecular dynamics methods were employed to examine the temperature dependence of membrane selectivity and nitrogen permeability for separation of an equimolar mixture of N₂ and He by a HKUST-1-based membrane at a pressure drop of 0.1, 0.3, and 1 MPa. It was shown that the selection of optimal temperature conditions made it possible to obtain a significant increase in membrane selectivity and permeability for nitrogen compared to corresponding parameters at room temperature.

中文翻译：

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HKUST-1 膜上的低温 N2 和 He 分离

摘要

_{基于膜的气体分离技术可以集成到现有的工业流程中，在从N 2} /He混合物中分离粗氦及其纯化阶段从天然气中低温回收氦。这些过程的有效性受制膜材料特性的影响最大。由于其独特的性能，金属有机骨架是用于气体分离的有前途的材料。在目前的工作中，采用蒙特卡罗和平衡分子动力学方法来研究膜选择性和氮渗透性的温度依赖性，以通过基于 HKUST-1 的膜在压降下分离 N 2 和 He 的等摩尔_混合物0.1、0.3 和 1 MPa。结果表明，与室温下的相应参数相比，最佳温度条件的选择使得膜选择性和氮渗透性显着增加成为可能。