Comparative evaluation of microwave-assisted acid, alkaline, and inorganic salt pretreatments of sugarcane bagasse for sugar recovery
Comparative evaluation of microwave-assisted acid, alkaline, and inorganic salt pretreatments of sugarcane bagasse for sugar recovery
复制标题
DOI：
10.1007/s13399-020-00680-7
复制
发表时间：
2020-03
影响因子：
4
通讯作者：
Zongyuan Zhu;Yanbing Liu;Xinglin Yang;S. McQueen-Mason;L. Gomez;D. Macquarrie
中科院分区：
文献类型：
--
作者：
Zongyuan Zhu;Yanbing Liu;Xinglin Yang;S. McQueen-Mason;L. Gomez;D. Macquarrie
微波加热技术在生物精炼厂生产生物燃料和生物质衍生化学品方面引起了极大的关注。通常采用NaOH和h2so4预处理来提高工艺效率。传统的加热预处理需要较长的反应时间，并有助于糖的快速降解。h2so4预处理虽然有效，但存在设备腐蚀、抑制剂生成和废水产生的缺点。在微波加热下对蔗渣进行NaOH、H2SO4和fecl3预处理，比较预处理过程中对蔗渣生物质物理特性、化学成分和糖类释放的影响。结果表明，通过改变预处理介质，微波加热5 ~ 10 min，预处理液中糖含量高，木糖和葡萄糖选择性回收。NaOH对生物质进行高效分馏，预处理液中主要产物为木糖，固体残渣更易消化。h2so4和fecl3均能有效降解半纤维素和纤维素，预处理液中主要产物为葡萄糖。与H2SO4相比，fecl3预处理在5 min内更有效地去除木质素，回收48%的葡萄糖。对生物质化学组成和形态特征进行了研究和比较，证实微波辅助fecl3预处理是替代h2so4用于生物燃料和生物质衍生化学品生产的一种新的可行方法。
Microwave heating technology has attracted great attention in biorefineries to generate biofuels and biomass-derived chemicals. NaOH and H2SO4pretreatments are often applied to improve the process efficiency. Traditional heating pretreatments require long reaction times and contribute to rapid sugar degradation. Although effective, H2SO4pretreatment suffers from the disadvantages of equipment corrosion, inhibitors generation, and waste water production. Herein, we performed NaOH, H2SO4, and FeCl3pretreatments on sugar cane bagasse under microwave heating, and compared their effects on the biomass physical features, chemical compositions, and sugar release during pretreatment process. Our results showed that high amounts of sugar were obtained, and xylose and glucose were selectively recovered in the pretreatment liquor within 5–10 min of microwave heating by changing pretreatment media. NaOH efficiently fractionated biomass, generated xylose as the major product in pretreatment liquor, and left the solid residue more digestible. H2SO4and FeCl3effectively degraded both the hemicellulose and cellulose, producing glucose as the major product in the pretreatment liquor. Compared with H2SO4, FeCl3pretreatment more efficiently removed lignin and recovered 48% glucose within only 5 min. Biomass chemical composition and morphological characteristics were studied and compared, confirming that microwave assisted FeCl3pretreatment is a new and feasible approach to replace H2SO4for biofuel and biomass-derived chemicals production.