Comparison of Vegetable Oil Extraction Methods for Biodiesel
Date Issued
2006
Date
2006
Author(s)
Yiu, Ming-Chia
DOI
zh-TW
Abstract
Rapeseed oil is one the major feed stocks for biodiesel with great potential. The feasibility and efficiency of various rapeseed oil extraction systems with hexane, ethanol and water as solvents were studied and compared. Mathematical model of multi-stage counter-current-flow extraction was build and verified in this research. Six-stage counter-current-flow 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-flow 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 extraction-transesterification might be considered for the ethanol - rapeseed oil system, but the oil concentration in extract might obstruct the idea to be practical. In respect of Aqueous Enzymatic Oil Extraction (AEOE), pectinase and proteinase were used for rapeseed and soybean oil extraction. Oil recovery was 69% and 65% respectively as pectinase was used. Oil recovery was 58% and 70% respectively as proteinase was used. AEOE might be a process with less energy consumed, but inefficient in extraction yields and oil recovery from solution would be the main difficulty to be overcome.
Subjects
乙醇
正己烷
水
油菜籽
萃取
Ethanol
Hexane
Water
Rapeseed
Extraction
Type
thesis
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