The potential of membrane technology for Xenon (Xe) and Krypton (Kr) separation is evaluated at sub-ambient temperatures ($-$30 to 20°C) by simulating two- and three-stage membrane processes. Unlike conventional membrane simulations, a rigorous approach of modelling is employed to capture the non-ideal behavior of Xe and Kr at the sub-ambient temperatures and permeability changes due to the Joule-Thomson effect. A selectivity target of $\ge$99 mol% in Xe and Kr purity is used, based on the activation energy of permeation. Results show the membrane processes require moderate Xe/Kr selectivity, achievable with current membranes, and reasonable pressure ratios of 5-15 to produce high purity Xe and Kr at the sub-ambient temperatures. The energy demand of the three-stage membrane process is determined and compared to that of conventional cryogenic distillation. The comparison shows significantly lower energy demand for the membrane process.

在低于室温的温度下评估膜技术用于氙（Xe）和K（Kr）分离的潜力（$--$30至20°C），通过模拟两阶段和三阶段的膜过程。与常规的膜模拟不同，采用严格的建模方法来捕获Xe和Kr在低于室温的温度和由于焦耳-汤姆森效应引起的渗透率变化的非理想行为。选择性目标$\ge$基于渗透的活化能，使用Xe和Kr纯度为99mol％。结果表明，膜工艺需要适度的Xe / Kr选择性，这是目前的膜所能达到的，并且合理的压力比为5-15，才能在低于室温的温度下产生高纯度的Xe和Kr。确定了三级膜工艺的能量需求，并将其与常规低温蒸馏的能量需求进行比较。比较表明，膜工艺的能源需求显着降低。