跳到主要內容

臺灣博碩士論文加值系統

(44.201.97.0) 您好!臺灣時間:2024/04/17 23:09
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:陳金明
研究生(外文):Jin Ming-Cheng
論文名稱:攪拌萃取槽內相轉換之研究
論文名稱(外文):The Study Of Phase Inversion In A Stirred Tank
指導教授:江建利
指導教授(外文):Mr.Chiang
學位類別:碩士
校院名稱:國立成功大學
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:1993
畢業學年度:81
語文別:中文
論文頁數:60
中文關鍵詞:相轉換
外文關鍵詞:Phase Inversion
相關次數:
  • 被引用被引用:0
  • 點閱點閱:133
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
一般化工的批式萃取操作中,常牽涉油水兩相間的界面問題。油水兩相的
界面積愈大,萃取效果愈好。在固定攪拌速度下,不斷增加分散相的
hold-up ,即會造成相轉換,這是熱力學趨於最穩態的自然趨勢。有別於
以往的研究,本實驗採不添加指示劑的方式,對整個系做電導度測量。透
過數據處理,記錄相轉換的發生過程。  透過電壓的分析及照片的幫助
,確認了部份相轉換的發生;界面活性物質有助於系統行成良好分散。質
傳提早相轉換發生及Marangoni effect在質傳過程中促進液滴合併。由這
些結果印證以往的研究,我們常能獲得良好解釋。

Liquid-liquid interfacial problems are frequently encountered
in chemical industrial operations such as extraction
,hetrogeneous reaction.It was well known that the more
interfacial area is created ,the more efficient operation will
be attained.There are two approaches to increase interfacial
area-increasing dispersed phase volume or decreasing the drop
size of dispersed phase. With constant stirred rate,that more
and more dispersed phase is added into a fixed volume of
continuous phase will cause phase inversion to take place.This
is a natural trend for the system to minimize the total energy
. Differing from the past researches,this study measure voltage
of dispersion but dosen't apply any indicator.By the help of
this data acquisition and photographs ,we can understand the
process of occurrance during phase inversion. The
characterization of localized phase inversion for different
systems were identified by the help of voltage analysis and
photographs; Surface active agents could avoid localized phase
inversion to happen;With water as the dispersed phase,
surfactants such as span20 or span80 help the aqueous to be
continues at lower stirred rates but at high stirred rate that
effect will not necessarily be so.The effect of mass transfer
would accelerate the happening of phase inversion. Marangoni
effect raises the drops-coalescence rate;In addition,the
systems with larger difference in density would have narrower
hysteresis regions.Some of the results got the same conclusions
as the past researches' did,but more parameter being examined.
Some results are different from those reported in the
literature but we can get reasonable explanation.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top