中空纖維薄膜模組萃取回收螯合銅陰離子之質傳研究

Mass Transfer Studies on Extration Recovery of Chelated Copper Anions in Hollow Fiber Membranes

黃依蘋(I-Pyng Huang)

指導教授 ： 莊瑞鑫

元智大學/工程學院/化學工程與材料科學學系/碩士(1998年)

摘要

本論文旨在研究利用中空纖維膜模組萃取回收Cu-EDTA之質傳研究；實驗共分為三個部分，首先探討萃取平衡、其次則利用疏水性平板式薄膜傳送槽探討萃取動力學，並利用平衡及動力學所得之複合物、反應速率式及速率常數，進而探討利用中空纖維膜模組萃取的質量傳送；所使用的萃取劑為四級銨鹽（Aliquat 336），稀釋劑為煤油（Kerosene）。
在萃取平衡部分，實驗的變數有：水相的pH值、Cu-EDTA的濃度、銅離子與螯合劑的比值（α值）、萃取劑濃度及操作溫度等，分別探討各操作條件變數對萃取反應的影響，並將實驗所得之結果作一平衡常數（Kex = 0.12）及反應熱（ΔH = 14.5 kJ/mol）的估算。
在萃取動力學部分，本文以一薄膜傳送槽（Membrane-based permeation cell）來探討萃取系統的界面動力學；首先估算出整個系統中各個成份的擴散係數，並由擴散係數求出其質傳係數；其次則測定出萃取反應的反應速率式（ ）及速率常數（ m5/2/mol1/2s），另外由溫度效應與速率常數的關係中求得萃取反應的活化能（Ea = 52.8 kJ/mol）。
在質量傳送方面，其主要目的是在探討Cu-EDTA在含四級銨鹽（Aliquat 336）的中空纖維（Hollow Fiber）中之質量傳送。以在萃取動力學方面所得之反應機構及經估算所得之質傳係數，建立一理論模式，由理論模式所算出的結果與實驗的結果相比較。

關鍵字

萃取 ； 中空纖維薄膜 ； 螯合銅陰離子

並列摘要

The equilibrium and kinetics studies as well as mass transfer of solvent extraction of the Cu-EDTA anions were investigated in this study. Quaternary amine, Aliquat 336, and kerosene were utilized as extractant and diluent, respectively. In the extraction equilibrium study the effects of pH of aqueous phase、the concentration of Cu-EDTA、the chelating agents ratio（α）、the concentration of extractant， and temperature were studied. The experiment results showed an equilibrium constants Kex of 0.12 and a reaction enthalpy △H of 14.5 kJ/mol. In extraction kinetics study，the membrane-based permeation cell was adopted to study the interfacial transfer kinetics. The diffusion coefficient of each species was estimated， the mass transfer coefficient could be also obtained. The rate equation and the rate constant（ ）were determined. In addition ， an activation energy Ea of 52.8 kJ/mol for extraction could also be obtained from temperature dependence of rate constant. Finally, the mass transfer of Cu-EDTA through a hollow-fiber membrane module containing Aliquat 336 was investigated . The results of the reasonable mechanism were compared with the experiment of results.

並列關鍵字

Extration ； Hollow Fiber Membranes ； Chelated Copper Anions

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