Condensation of VOCs in VOC-enriched permeate streams at room temperature in membrane-based VOC/N₂ separation make accurate measurement of membrane separation performance difficult. Membrane performance is important for obtaining fundamental data for industrial applications. Therefore, in this work, a modified constant volume/variable pressure method was developed to avoid the effects of VOC condensation in the permeate and to accurately determine membrane performance for the separation of VOC/N₂ mixtures. Development of the method is discussed and validated by measuring the separation performances of p-xylene/N₂ mixtures using a PDMS/ceramic composite membrane, which showed good reliability. Effects of feed concentration, feed flow rate, and temperature on separation performance were investigated by this method for the separation of representative VOC pollutants such as acetone, p-xylene, ethanol, and ethyl acetate. The permeabilities of VOC and N₂ and their interaction was easily obtained, which open the possibility of the investigation of the interactions between VOC and N₂ during vapor permeation.

在基于膜的VOC / N ₂分离中，室温下富含VOC的渗透液中VOC的冷凝使膜分离性能的准确测量变得困难。膜的性能对于获得工业应用的基础数据很重要。因此，在这项工作中，开发了一种改进的恒定体积/可变压力方法，以避免渗透液中VOC冷凝的影响，并准确确定用于分离VOC / N ₂混合物的膜性能。通过测量对二甲苯/ N ₂的分离性能讨论并验证了该方法的开发使用PDMS /陶瓷复合膜的混合物，显示出良好的可靠性。通过该方法研究了进料浓度，进料流速和温度对分离性能的影响，该方法用于分离代表性的VOC污染物，例如丙酮，对二甲苯，乙醇和乙酸乙酯。容易获得VOC和N ₂的渗透率及其相互作用，这为研究蒸气渗透过程中VOC和N ₂之间的相互作用开辟了可能性。