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首页> 外文期刊>Separation and Purification Technology >Preparation of dual-layer cellulose/polysulfone hollow fiber membrane and its performance for isopropanol dehydration and CO2 separation
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Preparation of dual-layer cellulose/polysulfone hollow fiber membrane and its performance for isopropanol dehydration and CO2 separation

机译：双层纤维素/聚砜中空纤维膜的制备及其对异丙醇脱水和CO2分离的性能

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摘要

Dual-layer cellulose/polysulfone (PSf) hollow fiber membrane used for isopropanol (IPA) dehydration and CO2 separation was prepared by using co-extrusion technique with a triple-orifice spinneret. N-methylmorpholine-N-oxide monohydrate (NMMOH2O) was selected as the cellulose solvent since it can dissolve cellulose through a purely physical process. Scanning electron microscopy (SEM) images show that there is no obvious delamination between the inner and outer layer and no obvious defect can be seen in the outer skin of the fiber. In order to find out the advantage of novel prepared dual-layer membrane over homogeneous cellulose membrane, tests including isopropanol dehydration by perva-poration and CO2 separation were carried out For pervaporation experiments, the effects of operation conditions including feed concentration and operation temperature on pervaporation (PV) performance were investigated systemically. The results showed that similar with the flat cellulose membrane, the permeation flux increased obviously with the increase of both water concentration in feed and operation temperature. Under all tested conditions, water contents in permeate maintained higher than 99.90 wt.%, and it reached a maximum value of 99.98 wt.% with a water content of 5 wt.% in feed at 25 °C Moreover, the water-swollen dual-layer cellulose/PSf hollow fiber membrane showed much higher gas permeation rate and comparable selectivities of CO2/H2, CO2/N2 and CO2/CH4. The CO2 permeance of dual layer cellulose/PSf hollow fiber membrane was ～3 GPU, which was five times higher than that of single-layer cellulose hollow fiber membrane. In a word, the performance, especially the permeation rate of new developed dual layer cellulose/PSf hollow fiber membrane was greatly improved by its reduced separation layer, and this could definitely increase its potential for later practical application.
机译：采用三孔喷丝板共挤出技术制备了用于异丙醇（IPA）脱水和CO2分离的双层纤维素/聚砜（PSf）中空纤维膜。选择N-甲基吗啉-N-氧化物一水合物（NMMOH2O）作为纤维素溶剂，因为它可以通过纯物理过程溶解纤维素。扫描电子显微镜（SEM）图像显示，内层和外层之间没有明显的分层，并且在纤维的外皮中没有看到明显的缺陷。为了发现新型制备的双层膜优于均质纤维素膜的优势，进行了渗透渗透异丙醇脱水和CO 2分离的试验。对于渗透蒸发实验，操作条件（包括进料浓度和操作温度）对渗透蒸发的影响（PV）性能进行了系统研究。结果表明，与扁平纤维素膜相似，渗透通量随进料水浓度和操作温度的增加而明显增加。在所有测试条件下，渗透液中的水含量保持高于99.90 wt。％，在25°C的进料中水含量为5 wt。％时达到最大值99.98 wt。％。层纤维素/ PSf中空纤维膜显示出更高的气体渗透率和相当的CO2 / H2，CO2 / N2和CO2 / CH4选择性。双层纤维素/ PSf中空纤维膜的CO2渗透率为〜3 GPU，是单层纤维素中空纤维膜的CO2渗透率的五倍。简而言之，通过减少分离层，大大提高了新开发的双层纤维素/ PSf中空纤维膜的性能，尤其是渗透率，这无疑可以增加其在以后的实际应用中的潜力。

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