油價的高漲，環保意識的抬頭，發展新型態且乾淨的替代能源成為全世界的首要目標。就目前發展的生質能而言，生質柴油能以回收的廢食用油進行生產，且具有生物可分解性、不含硫、無苯環化合物、燃燒排放物質較無污染，是一種兼顧環保並可永續經營的能量來源。
本研究主要利用傳統均相鹼製程的高轉化率優點，及離子液體具高極性的特性將生質柴油中的甘油、未反應完之甲醇及觸媒NaOH萃取入同一層，不僅使得後續biodiesel的純化步驟變得較易，並可進一步提升產率。
為消除質傳阻力對實驗的影響，進行轉速對產率之影響的探討，之後再探討離子液體種類、組成比例、加入時機對產率的影響。經實驗結果歸納得在轉酯化反應溫度60℃，轉速300rpm，醇油莫爾比6.4，NaOH添加0.28 g (0.14wt%油重)下，先讓轉酯化反應進行10分鐘後，加入30 g氯化膽鹼，即可在加入後的五分鐘將產率提高5%，並在3小時內達到93%的產率，較傳統鹼製程提高約16%。
產率得以提升的原因為反應產生的副產物甘油和添加的氯化膽鹼形成離子液體，破壞了反應的平衡，使轉酯化反應得以持續進行，於是產率提高。

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