Models for gas separations with spiral‐wound membranes are developed and found to exhibit good agreement with experiments performed on N₂/O₂ mixtures. The two‐dimensional (2D) model can be accurately approximated by a one‐dimensional (1D) surrogate model when the spacer widths are chosen to make the channel pressure drops small. Subsequently, the separation of propane/propylene mixtures from the recycle purge stream of a polypropylene reactor is investigated. Assuming ideal gas is found to lead to significant overestimations in membrane stage cuts (sometimes more than 10%), an extent comparable to that associated with extrapolating constant olefin permeance from a low‐pressure condition. While olefin permeance can change significantly with pressure, using a constant‐permeance formulation can result in a small (< 2.5%) underprediction in stage cut if the value for the permeance is taken from the feed condition. Finally, membrane properties and costs necessary for a viable separation process are discussed.

中文翻译：

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螺旋缠绕膜气体分离的建模与模拟

建立了螺旋缠绕膜气体分离模型，发现与在N ₂ / O ₂上进行的实验具有很好的一致性混合物。二维（2D）模型可以通过一维（1D）替代模型精确地近似当间隔宽度被选择以使该通道的压降小。随后，研究了从聚丙烯反应器的循环吹扫物流中分离丙烷/丙烯混合物的方法。假设发现理想气体会导致膜阶段切割的明显高估（有时超过10％），其程度可与从低压条件推断出恒定烯烃渗透率相关。尽管烯烃渗透率会随压力而显着变化，但如果将渗透率值取自进料条件，则使用恒定渗透率配方可能会导致阶段切割中的预测不足（<2.5％）。最后，