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Permeation of supercritical carbon dioxide through polymeric hollow fiber membranes

机译:超临界二氧化碳透过聚合物中空纤维膜的渗透

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Permeation of carbon dioxide has been measured for two types of composite polymeric hollow fiber membranes for feed pressures up to 18 MPa at a temperature of 313 K. The membranes consist of a polyamide copolymer (IPC) layer or a poly vinyl alcohol (PVA) layer on top of a polyethersulfone (PES) support membrane. For both membranes, the carbon dioxide permeance has a maximum as a function of the feed pressure at about 8 MPa. A good description of the maximum in the carbon dioxide permeance is possible with a model based on the ratio of the density to viscosity. A comparison with permeation results for nitrogen for feed pressures up to 16 MPa, supports the findings that viscous flow is the main mechanism for mass transport across the membranes. Both membranes show an increase in the carbon dioxide permeance as a function of the exposure time to supercritical carbon dioxide. Cross-linking of the IPC layer resulted in a stable IPC-based membrane at the cost of a small reduction in the carbon dioxide permeance.
机译:对于两种类型的复合聚合物中空纤维膜,在313 K的温度下进料压力高达18 MPa,已经测量了二氧化碳的渗透性。该膜由聚酰胺共聚物(IPC)层或聚乙烯醇(PVA)层组成在聚醚砜(PES)支撑膜的顶部。对于两种膜,二氧化碳渗透率在约8MPa下具有最大的作为进料压力的函数。利用基于密度与粘度之比的模型,可以很好地描述二氧化碳渗透率的最大值。与进料压力高达16 MPa的氮气的渗透结果进行比较,支持以下发现:粘性流是跨膜传质的主要机理。两种膜都显示出二氧化碳渗透率的增加,这是超临界二氧化碳暴露时间的函数。 IPC层的交联产生了稳定的基于IPC的膜,但其代价是二氧化碳渗透率略有降低。

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