生質柴油乃兼具環保及永續發展的綠色原油，但生產原料通常來自可食用的植物油，使得產品價格過高缺乏市場競爭性。另一種較便宜的原料取得方式則是藉由收集廢食用油，可降低整體生產成本。但其中所含大量游離脂肪酸需先以前處理將酸價降至一定值。為此，本研究主要將氣舉式反應器應用在廢食用油的前處理上，利用其熱量及質量傳送能力強及混和所消耗的能量低之優點以提升反應物與觸媒的混合程度，並利用甲醇蒸氣及空氣持續帶走酯化反應產生之水份，進而增加反應之轉化率。由於廢油成分過於複雜，本實驗以添加不同比例棕櫚酸於大豆油中的方式，模擬與廢食用油相同酸價的大豆酸油進行預酯化反應。所得較佳反應器參數為底部區高度4 cm、甲醇進口位於反應器底部、甲醇進口孔洞直徑0.1 ~ 0.12 mm，並通入空氣流量92 ml/s；預酯化較佳參數為甲醇流量14 ml/min、觸媒用量0.5 %、反應溫度80℃，可在反應時間60分鐘內將含5 % 游離脂肪酸之酸油酸價及含水率降至1 mg KOH/g與0.3 % 以下。並且，廢食用油在此條件下進行預酯化處理可得到非常相似的結果，符合鹼製程酸價及含水率的需求。

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