The Fabrication and Dehumidification Property analysis of polyacrylonitrile/Chitosan Composite Membrane

• Main Authors: Zi-Qing Yang, 楊子慶
• Other Authors: Hong-Ping Cheng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/u92938

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 105 === In the general building or office plant, the air conditioning system equipment, electricity consumption accounts for about one-third of the total power consumption, a part of the buildings power consumption of about half of the total power consumption. Simple use of refrigeration dehumidification, usually need to reheat, resulting in energy waste, if the use of thin film used in the dehumidification can significantly reduce energy consumption. In this study, the feasibility of thin film dehumidification was evaluated. Hydrophilic Chitosan polymers and Calcium Chloride(CaCl) were coated on polyacrylonitrile with good mechanical strength, chemical resistance and thermal stability. (Polyacrylonitrile, PAN) substrate film surface composite membrane, by comparing Chitosan stirring temperature and CaCl concentration to control the film dehumidification efficiency. In this study, we first explored the desiccant performance of PAN (15wt%) base film, and then scatched the Chitosan(2wt%) selective layer casting solution prepared at 30 ℃ and 90℃ and scraped with Chitosan(2wt%) Chitosan weight of 10,30,50,100% to determine the addition of CaCl grams of the formation of the selected layer of casting fluid, made 6 different composite membrane for performance comparison. The results show that the membrane flux of PAN (15wt%) is large but almost no dehumidification effect, and its surface structure pores are mostly caused by flux. When coating the selection layer of Chitosan, it can be found that the surface structure of the film is closer and complete, and the better effect is obtained by stirring at 90℃ with 30℃. The concentration of CaCl added by Chitosan was not proportional to the dehumidification efficiency. From 10,30,50,100%, it was found that the composite membrane had the best dehumidification effect at 10%, and the gas permeability increased with the increase of CaCl concentration decline. Adding CaCl surface structure can be found to have crystallization on the surface of the film, the compactness of the crystal, the number of aggregation will affect the performance of the film. The results of this study confirm that the PAN / Chitosan and PAN / Chitosan + CaCl composite membranes can be used to remove the water vapor in the air. In the future, the membranes with high dehumidification efficiency should be developed.