화학공학소재연구정보센터
Polymer(Korea), Vol.15, No.2, 182-190, April, 1991
키토산막을 통한 물-에탄올 수용액의 투과증발분리: 1. 키토산-아세트산 및 키토산-금속이온 복합체막
Pervaporation Separation of Water-Ethanol through Modified Chitosan Membrane : 1. Chitosan-Acetic Acid and-Metal Ion Complex Membranes
초록
키토산-아세트산 복합체막과 키토산-금속이온 복합체막들의 여러 공급액온도와 공급액 에탄올 농도에 대해 투과증발성능을 연구하였다. 키토산을 아세트산에 녹이고 유리판위에 캐스팅한 후 키토산-아세트산 복합체막을 얻고 이것을 수산화나트륨으로 처리하는 시간을 변화시켜 결정화도가 각기 다른 막을 얻었다. 또한 금속이온들을 키토산막내에 주입시킨 금속이온 복합체막도 제조하였다. 알칼리 처리시간이 길어지면 유량은 감소하였는데 이것은 알칼리 처리를 통해 키토산내의 결정성이 증가하였기 때문으로 해석된다. 금속이온들이 들어가면 물에 대한 선택성이 증가함을 알았다.
The pervaporation performance of chitosan-acetic acid complex membranes and chitosanmetal ion complex membranes were investigated in the present study. Chitosan was dissolved in an aqueous acetic acid solution and cast onto a glass plate to form a chitosan-acetic acid complex membrane. The chitosan-metal ion complex membranes were subsequently prepared by treating the chitosan-acetic acid membranes with NaOH solution. Pervaporation separation of water-ethanol mixture through these membranes was performed by varying the feed ethanol concentrations and temperatures. As alkali treatment time is prolonged, the flux decreased due to the increase in crystallinity as evidenced by the X-ray analysis and density measurements. Flux, however, increased with temperature. It was observed that the water selectivity could be improved in separating waterethanol mixtures by the incorporation of metal ions in chitosan membranes.
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