Abstract One of the main challenges in membrane gas separation is the plasticizing effect that reduces selectivity. For a better understanding of this phenomenon, the knowledge of the sorption behavior of each component of the mixture is necessary. For this purpose, the sorption thermosyphon apparatus (STA), was successfully designed and tested with gas sorption measurements. One of the main advantages of the STA compared to actual other methods is to ensure concentration uniformity at the headspace using a thermosiphon, as pressure decay is recorded. The equilibrium condition is not disturbed during the sampling and allow the obtention of accurate data at the end of the sorption experiment. To validate the novel system, the sorption, diffusion and permeation coefficients of pure CO2 and CH4, as well as for a CO2/CH4 (50/50) mixture, in polydimethylsiloxane (PDMS) were obtained through STA and other experimental techniques showing good agreement with literature data.

中文翻译：

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吸附热虹吸装置 (STA)：一种用于气体混合物吸附测量的新型准确系统

摘要 膜气体分离的主要挑战之一是降低选择性的塑化效应。为了更好地理解这种现象，需要了解混合物中每个组分的吸附行为。为此，成功设计了吸附热虹吸装置 (STA)，并通过气体吸附测量对其进行了测试。与实际的其他方法相比，STA 的主要优势之一是使用热虹吸管确保顶部空间的浓度均匀性，因为记录了压力衰减。平衡条件在采样过程中不受干扰，并允许在吸附实验结束时获得准确的数据。为了验证新系统、纯 CO2 和 CH4 以及 CO2/CH4 (50/50) 混合物的吸附、扩散和渗透系数，