I摘 要蒸汽渗透是分离混合蒸汽最有效的技术之一。与渗透汽化不同的是，在这一过程中，由于膜表面的亲水基团只与水蒸气接触，膜的溶胀系数会减弱，既保留了渗透汽化的一些优点，又克服了渗透汽化的一些缺点。因此，膜除湿技术因其具有选择性高、能耗低、工艺简单、无二次污染等优点而备受关注。其核心技术是制备高性能、无污染的超滤膜。因此，制备亲水性强、除湿效率高、稳定性好的气体超滤膜是该技术产业化的关键。现有平板膜机理制备的平板膜通量低，截留率相关性不好，制约了平板膜在工业领域的进一步应用。本文使用溶剂蒸发法制备氰乙基纤维素改性聚乙烯醇蒸汽渗透膜。膜的气体除湿性能随着 HEC 含量的增加也呈现先上升后降低的趋势，最优可达 73.10%。实现了膜的制备，及对其进行改性。设计了日产 300㎡平板刮膜机，能够实现精确控制膜厚以及其它各种制膜工艺条件，保证制膜重复性的要求，以满足市场上对于膜的需要。关键词：羟乙基纤维素 聚乙烯醇 蒸汽渗透 平板制膜机IAbstractAbstractSteam permeation is one of the most effective technologies for separating mixed steam. Different from pervaporation, in this process, because the hydrophilic groups on the membrane surface only contact with water vapor, the swelling coefficient of the membrane will be weakened, which not only retains some advantages of pervaporation, but also overcomes some disadvantages of pervaporation. Therefore, membrane dehumidification technology has attracted much attention because of its high selectivity, low energy consumption, simple process and no secondary pollution. The core technology is to prepare high-performance and pollution-free ultrafiltration membrane. Therefore, the key to industrialization of this technology is to prepare gas ultrafiltration membrane with strong hydrophilicity, high dehumidification efficiency and good stability. The low flux and the bad correlation of rejection of the existing flat membrane mechanism restrict the further application of the flat membrane in the industrial field. In...
