• 作者： Kuo, Sheng-Lung; Shih, Yen-Shiang
• 中文摘要： 硫離子之電化學反應,造成硫磺吸附在電極表面,使電極鈍化,有機萃取相之加入,可使電極表面更新,以利反應之進行,如此也形成多相系統之萃取式電化學反應。文中首先建立此種電化學反應模式,並經由一半批次萃取式電化學反應系統之動力分析,在靜態溶液下,硫離子之質傳數(K/sub m/)及硫磺溶在有機溶劑中之質傳係數(k/sub d/)分別為 1.07-2.12*10/sup -4/)(cm/sec)及1.18-6.05*10/sup -4/cm/sec同時,以總電流效率(.eta./sub 0/)為系統操作良窳之指標。此.eta./sub 0/為電流效率(.eta./sub i/)及萃取效率(.eta./sub x/)之乘積,當有效地提升.eta./sub x/值,系統在穩定下操作,硫磺在電極面之平均覆蓋率約.thetabar.=0.1使系統總反應在電化學反應速率控制下,可以得到.eta./sub 0/值在82%,此提供一實際可行之萃取式電化學反應器。
• 英文摘要： The sulfide ion in aqueous solution is oxidized electrochemically to sulfur on the anode surface which is passivated consequently. The anode can be regenerated by adding organic solvent, such as benzene or toluene, into the aqueous solution to extract away the adherent sulfur to allow a continuous operation feasible. This paper presents a kinetic model of the extractive electrochemical sulfide oxidation system in a semi-batch reactor designed for practical operation. The mass transfer coefficients of sulfide ion in the electrolyte solution and the mass transfer coefficients of sulfur in the organic solution were found to be (1.07-2.12)*10/sup -4/ and(1.18-6.05)*10/sup -4/cm/sec, respectively. An overall efficiency (.eta./sub 0/), defined to be the multiplication of current efficiency(.eta./sub i/) and extraction efficiency (.eta./sub x/), was used to evaluate the reactor performance. By adjusting effectively the extraction effect and the electrochemical reaction conditions, the electrochemical reaction step could be controlled to be the rate determining step and the overall efficiency was obtained to be as high as 82%. The average surface coverage (.thetabar. ) of sulfur on the anode was defined and calculated to be 0.1 in this study.
• 中文關鍵字： 硫化物; 氧化; 回收; 電化學反應器; 設計; 萃取反應器; 萃取選擇性電化學反應
• 英文關鍵字： Sulfide; Oxidation; Sulfur; Recovery; Electrochemical Reactor; Design; Extractive Reactor; Extractive Elective Electrochemical Reaction