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研究生:吳祥暉
研究生(外文):Hsiang-Hui Wu
論文名稱:空心纖維管薄膜模組超過濾之研究
論文名稱(外文):A Study on Ultrafiltration in Hollow-Fiber Membrane Modules
指導教授:葉和明葉和明引用關係
指導教授(外文):Ho-Ming Yeh
學位類別:碩士
校院名稱:淡江大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1994
畢業學年度:82
語文別:中文
論文頁數:107
中文關鍵詞:空心纖維管薄膜膠層極化結垢透膜壓差掃流速度
外文關鍵詞:Hollow-Fiber MembraneGel PolarizationFoulingTransmembrane
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超過濾乃是以壓差為驅動力,分離巨分子水溶液之薄膜分離程序。其濾速
之分析模式有: 膠層極化模式,滲透壓模式及阻力串聯模式。在本文中,
先改良膠層極化模式與阻力串聯模式,以提高濾速預測值之準確度。實驗
部份乃使用聚磺酸中空纖維管薄膜模組來過濾PVP-360 水溶液,其實驗值
與改良型阻力串聯模式之濾數預測值,非常吻合。然後應用改良型阻力串
聯模式,在固定中空纖維管表面積( 即 NL 為常數 ) 之條件下,求模組
之最適化管長或管數,結果發現在固定的入口溶液濃度 Ci 、體積流量及
透膜壓下,提高管長L(即減少管數N),會增加纖維管中之流速U i
。 經進一步探討可知, 流速U i 之增加對濾速有著兩個互相抵制之影
響:一為正面影響,即其減少了膠層之阻力而提高濾速;另一為負面影響
,即其降低透膜壓差,而減少濾速。所以,對超過濾濾速而言,會存在一
最適化之管長或最適化之管數。

Ultrafiltration is a pressure-driven membrane process used
for the separation of macrosolutes from a solvent, usually
water. The permeate flux of ultrafiltration of
macromolecular solution is usually analyzed by the gel
polarization model 、 the osmotic ressure model and the
resistance-in-series model. In the present study, the gel
polarization model and the resistance-in-series model have
been modified to improve the theoretical predication.
Experimental work has been carried out for
polyvinylpyrrolidone solutions which were ultrafiltrated by
using polysulfone hollow fiber membrane module. The
experimental data agree quite well with the correlation
equation based on the modified resistance-in- series model.
This modified model was then employed for optimum design of a
hollow fiber membrane module with total length of hollow
fibers N*L fixed . It was found that under certain solution
concentration Ci、 volume flow rate and trans- membrane
pressure at the inlet,incereasing the length of a hollow
fiber L (or decresing the number of hollow fiber N) will
increase the fluid velocity in hollow fiber Ui. Furthermore,
since the increase of Ui have two con- flict effect: one
is the desirable effect of decreasing the resistance of gel
layer on the fiber wall which is is good for
ultrafiltration, and the other one is the un- desirable
effect of decreasing the transmembrane pressure which is bad
for ultrafiltration . Therefore , with total length of hollow
fiber , there exists an optimum length L as well as optimum
number N of a hollow fiber for maximum permeate flux.

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