Study on extraction of microalgal biomass, pyrolysis of post-extraction biomass and analysis of post-extraction oil and bio-oil
Abstract
An extraction process of microalgal oil Botryococcus with solvent combined of n-hexane and ethanol in various volume ratios was studied. Parameters for the extraction were controlled for optimising the process, and the obtained microalgal oil was analysed by GC-MS techniques. The waste microalgal biomass after oil extraction was also pyrolised through a slow heat treatment process. The products of this process consisted of a liquid phase called pyrolysis oil or bio-oil and a black colour solid phase. The pyrolysis oil could be refi ned to become many kinds of bio-fuels such as gasoline, kerosene or diesel. The bio-oil was also analysed by GC-MS to determine its chemical composition which includes a lot of oxygenates. Therefore, the bio-oil surely needs to be upgraded in a hydrodeoxygenation process to improve the hydrocarbon composition.
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