油菜籽油逆向萃取研究

Studies on Counter-Current Extraction of Rapeseed Oil

于明嘉(Ming-Chia Yiu) ； 李允中(Yeun-Chung Lee) ； 謝志誠(Jyh-Cherng Shieh)

《農業機械學刊》 15卷4期 (2006/12) Pp. 11-22

https://doi.org/10.30062/JAM.200612.0002

摘要

菜籽油是高潛力的生質柴油原料，其油脂的萃取實驗在文獻上討論很多，但很少以工業實際使用的逆向萃取法進行數據分析。本研究旨在探討分別使用正己烷、乙醇作為萃取溶劑，進行菜籽油逆向萃取方法的效率分析與可行性評估。本研究建立多級逆向萃取的數學模式，並分別以兩種溶劑與固體比(E/R=4,8)進行實驗，驗證數學模式的實驗結果顯示E/R=4效果較佳，六級的逆向萃取，萃取收率達90%且萃取液濃度可維持8~9%(w/w)。文獻上曾討論以乙醇萃取同時進行交酯反應，但在本研究另以數學模式模擬不同級數與E/R比下，乙醇逆向萃取菜籽油，在E/R=20的九級逆向萃取，萃取液濃度才只有1.5~1.6%(w/w)，萃取收率可達87%，然而萃取液濃度過低將成為以乙醇進行萃取同時交酯反應在工業操作的最大阻礙。

關鍵字

逆向萃取 ； 油菜籽 ； 正己烷 ； 乙醇

並列摘要

Rapeseed is one the major feed stocks for biodiesel with great potential. The feasibility and efficiency of counter-current rapeseed oil extraction systems with hexane and ethanol as solvents were studied. A mathematical model for multi-stage counter-current extraction was developed and verified in this research. Six-stage counter-current extraction experiments were carried with two different solvent to raffinate ratio (E/R) i.e. E/R=4, 8. A better result was found with E/R=4, that gave 90% in oil recovery and 8~9% (w/w) oil concentration in extract. Counter-current ethanol-rapeseed oil extraction with varies stages and E/R ratios were simulated. A nine-stage extraction with E/R=20 shown that the oil concentration in ethanol was 1.5~1.6% (w/w) and oil recovery was 87%. Although in-situ extraction-transesterification might be considered for the ethanol - rapeseed oil system in literatures, but low oil concentration in extract might obstruct the idea to be practical in industrial application.

並列關鍵字

Counter-Current Extraction ； Rapeseed ； Hexane ； Ethanol