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| Progress on production of biodiesel from wet algal oil |
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| DOI： |
| KeyWord:wet algal wet algal oil wall breaking method in situ extraction transesterification method hydrothermal method |
| FundProject:国家自然科学基金资助项目（52266006）；贵州省省级科技计划项目资助（ZK\[2022\]一般061，ZK\[2022\]一般139）；贵州省教育厅自然科学研究项目（黔教技\[2022\]043号）；贵州大学自然科学专项（特岗）科研基金项目（贵大特岗合字\[2021\]10号）；贵州大学培育项目（贵大培育\[2020\]20号） |
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| Abstract: |
| The conversion of microalgae with high oil content, fast growth rate and environmental purification to produce biofuels has great development potential, which is one of the effective ways to achieve "carbon neutrality" and solve environmental problems. In order to reduce the energy consumption of microalgae preparation biodiesel, using wet extraction technology to directly extract oil from wet algae biomass for preparing biodiesel has been the research hotspot, three kinds of wet algae oil biodiesel preparation methods including traditional wall breaking for oil extraction and transesterification method, in situ transesterification method and new hydrothermal wall breaking for oil extraction and transesterification method were summarized and their existing problems were analyzed.The traditional wall breaking for oil extraction and transesterification method requires two steps of oil extraction with organic solvent and transesterification to realize the preparation of biodiesel，the production process is complex and the production input is high.In situ transesterification method can convert microalgal biomass into biodiesel in one step, but there are some problems such as excessive consumption of alcohol (acid catalytic in situ transesterification) or high energy consumption at high temperature and high pressure (supercritical alcohol in situ transesterification).The new hydrothermal wall breaking for oil extraction and transesterification method can realize the efficient separation of oil without using organic solvent. However, when the hydrothermal temperature is high, the reaction of oil and other components of microalgae can deteriorate the oil quality. When the hydrothermal temperature is low, it is difficult to effectively destroy the cell wall, resulting in low oil extraction efficiency.Green solvent-assisted hydrothermal method can effectively reduce the hydrothermal temperature and inhibit the generation of by-products, which can improve the extraction rate of wet algae oil. In order to realize the preparation of biodiesel with high efficiency, environmental protection and low energy consumption by wet algae oil, it can further rely on innovative green solvents such as deep eutectic solvent to achieve high efficiency,low consumption and green extraction of microalgae oil. |
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