การกำจัดไอออนของโลหะสังกะสีออกจากน้ำมันหล่อลื่นที่ใช้งานแล้ว โดยการสกัดของเหลวด้วยของเหลว / สมนึก ภาคพานิชย์ = Zinc ion removal from used lubrication oil by liquid-liquid extraction / Somnuek Phakpanich
Removal of contaminated metal ions is a part of regeneration process of used lubrication oil. This study is focus on the removal of zinc ion from used lubricating oil by liquid-liquid extraction which Ammonium sulphate was used as the extractant and Scheibel column was used as reactor and to study the effect of various parameters in the extraction process. This study, Ammonium sulphate was used at the concentration of 8 percent by weight. From the results, we found that at the steady state Zinc ion was removed from 1,650 ppm to 10 ppm. Furthermore, we found that flow rate of extractant, flow rate of used lubricating oil and speed of motor effected the degree of extraction. Increase of used lubricating oil flow rate caused less Zinc ion removed but increase of extractant flow rate and increase of motor speed gave the same effect, more Zinc ion removed. However, Zinc ion could not be completely removed eventhough the parameters which direct effect the degree of extraction were adjusted. The conditions giving the highest efficiency of extraction are a ratio of extractant flow rate to used lubricating oil flow rate of 1:5 and a motor speed of 900 rpm.