- 學位論文
利用金屬氧化物進行麻瘋樹原油磷脂脫除與吸附之探討
The study of metal oxide adsorbents to adsorb phospholipid from Jatropha curcas crude oil
摘要
本實驗嘗試利用Al2O3與ZrO2作為吸附劑對麻瘋樹原油的磷脂進行去除，並研究其去除潛能。相較於傳統的去除方式，吸附劑分離可減少了能源的消耗與廢液的產生。 整個操作系統共分為四階段，第一階段為不同金屬氧化物的準備與預處理，第二階段為氧化物的吸附實驗，第三階段為樣品之微波消化，最後階段則是分析，檢測吸附過後之麻瘋樹油裡所含的磷含量。 吸附實驗分為兩階段，第一階段為吸附平衡實驗，第二階段為動態吸附實驗。根據實驗得到ZrO2與Al2O3之最佳吸附平衡時間分別為30與15 min且吸附平衡時間不隨濃度增加而改變。本實驗嘗試利用電子轉移與電負度差來解釋吸附現象。 等溫吸附曲線根據曲線分三階段解釋，前段低濃度時，ZrO2其吸附量的表現符合Langmuir的單層吸附，表示ZrO2屬於良性吸附。在低濃度時Al2O3的吸附量約在0.2 mg / g左右，因其表面積很低且與磷脂的親和力有限，導致吸附效果不彰。雖然兩者的表面積相差很小，但是可明顯看出ZrO2的效果明顯優異於Al2O3。中段濃度則因為磷脂團聚的因素導致吸附曲線呈線性上升，後段當磷脂超過230ppm時，吸附量就會開始降低。原因是其磷脂濃度過高且吸附量變化過於微小，造成分析檢測油樣時，其磷脂含量仍沒降低。
並列摘要
Al2O3 and ZrO2 used as adsorbent to remove phospholipid from Jatropha crude oil and those removal potential in this study. In contrast to conventional method, adsorbent remove can decrease energy consumption and the waste. All operation system were in four processes, first was the preparation and pre-treatment of different metal oxides, second was adsorption experiment with metal oxides, third was samples digestion with microwave-assisted, final process was samples analysis, determining the phosphorus contents from Jatropha oil after adsorption. Adsorption experiment were carried out in two steps, first was adsorption isotherm, second was dynamic adsorption. The best contact time of adsorption from ZrO2 and Al2O3 were 30 and 15 min, respectively. The best contact time of adsorption did not change with the concentration of phospholipid increasing. The effect of electron transfer and electronegativity were studied. It was found that the adsorption isotherm could divided into three process. In low concentration, ZrO2 could be well described by Langmuir model. It showed good fit. The uptake of Al2O3 was found to be around 0.2 mg/g, Due to the surface area and affinity were low, the effect of adsorption of Al2O3 were poor. Although the difference of surface area between ZrO2 and Al2O3 were small, ZrO2 had better adsorption capacity than Al2O3. The effect of phospholipid aggregation led to the adsorption curve increased linearly when phospholipid exceed low concentration. The uptake were reduced when phospholipid exceed 230 ppm. Phospholipid concentration was too high and the adsorption capacity of change was too small, led to the phospholipid content didn’t reduce when the determination of phosphorus to oil samples.