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首页> 外文期刊>Journal of Applied Polymer Science >Oxygen enrichment from air through multilayer thin low-density polyethylene films
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Oxygen enrichment from air through multilayer thin low-density polyethylene films

机译：通过多层低密度聚乙烯薄膜从空气中富氧

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Several multilayer thin low-density polyethylene (LDPE) films were fabricated by blown thin film having a thickness of 7 mum and an area of 130 cm(2). They were characterized for their oxygen-enrichment performance from air by a constant pressure-variable volume method in a round permeate cell with an effective area of 73.9 cm(2). The relationship between oxygen-enrichment properties, including oxygen-enriched air (OEA) flux, oxygen concentration, permeability coefficients of OEA, oxygen, nitrogen, as well as separation factor through the multilayer LDPE films, and operating parameters, including transfilm pressure difference, retentate/permeate flux ratio, temperature, as well as layer number, are all discussed in detail. It is found that all of the preceding oxygen-enrichment parameters increase continuously with an increase of transfilm pressure difference from 0.1 to 0.65 MPa, especially for the trilayer and tetralayer LDPE films. The oxygen concentration and separation factor appear to rapidly increase within the retentate/permeate flux ratio below 200, and then become unchangeable beyond that, whereas the OEA flux and the permeability coefficients of OEA, oxygen, and nitrogen seem to remain nearly constant within the whole retentate/permeate flux ratio investigated, especially for the monolayer and bilayer LDPE films. The selectivity becomes inferior, whereas the permeability becomes superior, as the operating temperature increases from 23 to 31degreesC. The highest oxygen concentration was found to be 44.8% for monolayer LDPE film in a single step with air containing oxygen of 20.9% as a feed gas and operating pressure of 0.5 Mpa at a retentate/permeate flux ratio of 340 and 23degreesC. The results demonstrate a possibility to prepare an oxygen-enriching membrane directly from air, based on the easily obtained thin LDPE films. (C) 2002 John Wiley Sons, Inc. [References: 36]
机译：多层多层低密度聚乙烯（LDPE）薄膜是通过吹塑薄膜制成的，厚度为7微米，面积为130厘米（2）。通过恒定压力可变体积方法在有效面积为73.9 cm（2）的圆形渗透池中从空气中富氧性能来表征它们。包括富氧空气（OEA）流量在内的富氧特性，氧浓度，OEA，氧，氮的渗透系数以及通过多层LDPE膜的分离系数与包括透膜压差在内的运行参数之间的关系，渗余物/渗透物通量比，温度以及层数均已详细讨论。发现所有上述氧气富集参数随着跨膜压差从0.1到0.65 MPa的增加而连续增加，特别是对于三层和四层LDPE膜而言。在低于200的渗余物/渗透物通量比内，氧气浓度和分离因子似乎迅速增加，然后变为不变。而在整个系统中，OEA通量和OEA，氧气和氮气的渗透系数似乎保持恒定研究了滞留物/渗透物通量比，特别是对于单层和双层LDPE膜。随着工作温度从23℃升高到31℃，选择性变差，而渗透率变好。对于单层LDPE膜，在含氮气为20.9％的空气作为进料气，工作压力为0.5 Mpa，滞留物/渗透物通量比为340和23°C的情况下，一步得到的最高氧气浓度为44.8％。结果表明，基于容易获得的LDPE薄膜，可以直接从空气中制备富氧膜。 （C）2002 John Wiley Sons，Inc. [参考：36]

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