成果報告書詳細
管理番号20150000000101
タイトル*平成26年度中間年報 バイオマスエネルギー技術研究開発 戦略的次世代バイオマスエネルギー利用技術開発事業 (次世代技術開発) 高油脂生産微細藻類の大規模培養と回収および燃料化に関する研究開発
公開日2015/4/23
報告書年度2014 - 2014
委託先名株式会社デンソー 学校法人中央大学 株式会社クボタ 出光興産株式会社
プロジェクト番号P10010
部署名新エネルギー部
和文要約
英文要約Microalgal-derived biofuel is recognized as a third generation biofuel, because it does not compete with food and has a high potential for accumulating oil. We have to develop i) energy-saving and automatic cultivation system, ii) harvesting processes, and iii) catalyst technology for producing drop-in fuel toward the practical use.
We have some plans to reduce cultivation costs to a practical level, such as improving water recycle technologies, developing automation system and reducing the power consumption required for the culture.
The most important issue for the water recycle technologies is a reduction of water-soluble organic matter in a culture broth, because it would cause protozoa contamination problem. If the contamination problem has occurred in a broth, the automated cultivation system cannot be realized. Therefore, we had studied how to remove the organic matter in a broth. As the water-soluble organic carbon level in a broth is not high, we selected sand filtration system. We have succeeded in reducing the water-soluble organic matter by using Sirasu as a carrier of bacteria under acidic condition in 2013 fiscal year. In 2014, we have revealed that the microalga can be cultured without predation damage by the contamination in a culture broth under 5ppm of organic mater concentration. And we have studied the threshold limit of the number of bacteria to suppress the large growth of protists. Then, in order to improve the organic mater degradation efficiency of sand filtration system, we showed the optimum specification of water recycling device by using mixture of Sirasu and other carrier of bacteria.
Finally, we developed novel harvesting process, which includes both membrane filtration and sedimentation process. We optimize the operation condition in lab-scale experiment and applied it to the pilot-scale system. As a result of the pilot-scale experiment, 300-fold concentration and high flux operation of 4.0 m/d was found to be achieved. In addition, we make a tool to predict the operation flux based on the analysis of fouling index and particle size distribution of microalgae.
Our goal is to produce “drop-in fuel”, considering practical use. Hydro-treated bio-jet (HBJ) and hydro-treated bio-diesel (HBD) are the corresponding fuels. We firstly studied a pretreatment method for removing impurity metals from crude oil to avoid catalyst deactivation in the following hydro-treating unit. The study of pretreatment conditions revealed that most of the metals can be removed. The elimination of halogen compounds is a remaining task. As for the hydro-treating, two types of catalysts were developed to apply the two-step reaction unit; a hydro-deoxidation unit and a hydro-cracking & isomerization unit. The hydro-deoxidation catalyst showed the 100% de-oxidaion rate, producing n-paraffin solely. The hydro-cracking & isomerization catalyst exhibited satisfying performance using model n-paraffin compound as a feedstock. The product paraffin had very high iso / normal ratio with the carbon numbers fitting to Jet fuel. This suggests that the developed catalysts would have a high potential for the application to the HBJ production.
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