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首页> 外文期刊>Energy Conversion & Management >A novel integrated biorefinery process for diesel fuel blendstock production using lipids from the methanotroph, Methylomicrobium buryatense
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A novel integrated biorefinery process for diesel fuel blendstock production using lipids from the methanotroph, Methylomicrobium buryatense

机译：一种新的综合生物精炼工艺，可使用甲烷营养菌，伯氏甲烷氧化菌的脂质生产柴油混合燃料

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摘要

In light of the availability of low-cost methane (CH4) derived from natural gas and biogas along with increasing concerns of the greenhouse gas emissions, the production of alternative liquid biofuels directly from CH4 is a promising approach to capturing wasted energy. A novel biorefinery concept integrating biological conversion of CH4 to microbial lipids together with lipid extraction and generation of hydrocarbon fuels is demonstrated in this study for the first time. An aerobic methanotrophic bacterium, Methylomicrobium buryatense capable of using CH4 as the sole carbon source was selected on the basis of genetic tractability, cultivation robustness, and ability to accumulate phospholipids in membranes. A maximum fatty acid content of 10% of dry cell weight was obtained in batch cultures grown in a continuous gas sparging fermentation system. Although phospholipids are not typically considered as a good feedstock for upgrading to hydrocarbon fuels, we set out to demonstrate that using a combination of novel lipid extraction methodology with advanced catalyst design, we could prove the feasibility of this approach. Up to 95% of the total fatty acids from membrane-bound phospholipids were recovered by a two-stage pretreatment method followed by hexane extraction of the aqueous hydrolysate. The upgrading of extracted lipids was then demonstrated in a hydrodeoxygeation process using palladium on silica as a catalyst. Lipid conversion in excess of 99% was achieved, with a full selectivity to hydrocarbons. The final hydrocarbon mixture is dominated by 88% pentadecane (C15H32) based on decarbonylation/decar boxylation and hydrogenation of C16 fatty acids, indicating that a biological gas-to-liquid fuel (Bio-GTL) process is technically feasible. (C) 2017 The Authors. Published by Elsevier Ltd.
机译：鉴于从天然气和沼气获得的低成本甲烷（CH4）的可用性以及对温室气体排放的日益关注，直接从CH4生产替代性液体生物燃料是一种捕捉浪费能源的有前途的方法。这项研究首次证明了一种新颖的生物精炼概念，该概念将CH4的生物转化为微生物脂质以及脂质提取和烃类燃料的生产相结合。基于遗传易处理性，培养稳健性和在膜中积聚磷脂的能力，选择了一种能够使用CH4作为唯一碳源的好氧甲烷营养菌，即伯氏甲烷氧化菌。在连续气体鼓泡发酵系统中培养的分批培养中，最大脂肪酸含量为干细胞重量的10％。尽管通常不认为磷脂是升级为烃类燃料的良好原料，但我们着手证明，结合使用新型脂质提取方法和先进的催化剂设计，我们可以证明这种方法的可行性。通过两阶段的预处理方法，然后从己烷中提取水解产物，可以从膜结合的磷脂中回收高达95％的总脂肪酸。然后在加氢脱氧过程中使用钯/二氧化硅作为催化剂证明了提取脂质的提质。脂质转化率超过99％，对烃类具有完全选择性。基于C16脂肪酸的脱羰/十烷基化和加氢，最终的烃混合物以88％的十五烷（C15H32）为主，这表明生物气液燃料（Bio-GTL）工艺在技术上是可行的。 （C）2017作者。由Elsevier Ltd.发布

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