Supercritical extraction as an effective first-step in a maize stover biorefinery
Supercritical extraction as an effective first-step in a maize stover biorefinery
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DOI：
10.1039/c5ra07485a
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Hunt, Andrew J.
中科院分区：
文献类型：
--
作者：
Attard, Thomas M.;Theeuwes, Elke;Hunt, Andrew J.
超临界二氧化碳（scCO（2））已被研究用于产生有价值的蜡质化合物，并作为一个整体的玉米秸秆生物炼制的附加值技术。在玉米秸秆水解和发酵之前进行ScCO2提取和分级。通过scCO（2）对粗提取物进行分馏，得到具有不同组成和熔融温度的蜡提取物，使得它们能够用于不同的应用。一种这样的级分表现出作为洗衣机洗涤剂制剂中的可再生洗涤剂的显著潜力。此外，scCO（2）提取已被证明对玉米秸秆的下游加工具有积极影响。scCO（2）提取的玉米秸秆水解产物的发酵表现出更高的葡萄糖消耗和更大的表面活性剂（与未scCO（2）处理的秸秆相比）和乙醇产量（在scCO（2）预处理后总乙醇产量增加40%）的潜在增长。这项工作代表了从低价值废物中提取高价值成分的重要发展，并证明了使用scCO（2）提取作为生物质加工第一步的好处，包括加强生物质的下游加工，以生产第二代生物燃料，作为综合整体生物精炼厂的一部分。
Supercritical carbon dioxide (scCO(2)) has been investigated for the generation of valuable waxy compounds and as an added-value technology in a holistic maize stover biorefinery. ScCO2 extraction and fractionation was carried out prior to hydrolysis and fermentation of maize stover. Fractionation of the crude extracts by scCO(2) resulted in wax extracts having different compositions and melting temperatures, enabling their utilisation in different applications. One such fraction demonstrated significant potential as a renewable defoaming agent in washing machine detergent formulations. Furthermore, scCO(2) extraction has been shown to have a positive effect on the downstream processing of the maize stover. Fermentation of the scCO(2) extracted maize stover hydrolysates exhibited a higher glucose consumption and greater potential growth for surfactant (in comparison with non-scCO(2) treated stover) and ethanol production (a 40% increase in overall ethanol production after scCO(2) pre-treatment). This work represents an important development in the extraction of high value components from low value wastes and demonstrates the benefits of using scCO(2) extraction as a first-step in biomass processing, including enhancing downstream processing of the biomass for the production of 2nd generation biofuels as part of an integrated holistic biorefinery.