Study on Crosslinked Chitosan/Zeolite Hybrid Membranes for the Dehydration of Ethanol-Water Solutions

• Main Authors: Hsin-yin Tsai, 蔡欣穎
• Other Authors: Han-chen Ling
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/04889989850635050274

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 96 === The aim of this study is to investigate the dehydration of aqueous ethanol solutions by pervaporation using chitosan membranes which were crosslinked in sulfuric acid and embedded with various types of zeolites(3A, 4A, 5A, NaX and NaY). Effects of crosslinking time, zeolite contents and operation temperature on pervaporation performances were studied. The membranes were characterized by Fourier transform-infrared spectrometry(FT-IR), X-ray diffractometer(XRD), scanning electronic micro- scopy(SEM). In addition, thermal properties of the membranes embedded with different amout of silica were investigated by thermal gravimetric ananlysis(TGA). Furthermore, effects of crosslinking time, contents and types of zeolite on swelling behaviors in ethanol and in water of chitosan membranes were also investigated. Compared to the uncrosslinked chitosan membranes, the swelling ratio of the crosslinked chitosan membranes in water increased slight, whereas it declined quite obviously in ethanol. This can be attributed to the enhancement in polarity of the membranes by crosslinking. With addition of zeolites, the swelling ratio in water increased with increasing zeolite contents while it decreases more significantly in ethanol compared to the data of membranes without zeolite embedded. It is found that the total permeability increased with increasing zeolite contents in the EtOH/water pervaporation experiments. On the other hand, the increase in separation factor was observed only when the contents of zeolite were above 20wt.%.