Biodiesel Production from Wet Microalgae by Direct Transesterification and its Kinetics
Date Issued
2014
Date
2014
Author(s)
Yeh, Yun
Abstract
Microalgae, a photosynthetic organism, has the ability of fast-growing and lipid accumulating, which makes it a highly potential source of biofuel. However, there are some current technical barriers, such as high energy and organic solvent consumption for harvest, drying and lipid extraction. To make the process of producing biofuel production from microalgae economically feasible, an innovative process was designed to convert lipid inside microalgae into biodiesel.
In this study, Chlorella sp. ESP-6 was used as the source of triglyceride. Direct transesterification (DT) is a method directly converting lipids within algae into biodiesel, fatty acid methyl esters (FAME). In this study, our DT first disrupted the cell wall of microalgae, extracted lipids and converted them by saponification and transesterification with alkali-methanol solution, then converted the product of saponification into FAME by esterification with acid methanol. Result showed that the reaction time of DT is about 1/20 of the traditional drying-extraction- transesterification process with comparable yield. More importantly, this 2 stage DT was insensitive to the water content of the raw material (up to 90%), and the yield was 2 ~ 6 times of other DT methods when using wet microalgae. Meanwhile, the effects of parameters including catalyst concentration, temperature and ratio of methanol and water were evaluated. A second order irreversible and a second order reversible reaction kinetic model were proposed to describe DT satisfactorily.
Subjects
微藻
直接轉酯化
生質柴油
動力學
Type
thesis
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