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Chemical pretreatment of sugarcane bagasse with liquid fraction recycling

机译：甘蔗棒与液体分数回收的化学预处理

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Pre-treating lignocellulosic biomass is a major technological challenge. Recycling the liquid fraction may reduce chemical inputs and water use but may have lower efficiency. Seven chemical pre-treatments of sugarcane bagasse were compared: four acids (sulfuric, citric, phosphoric, and oxalic), two alkaline (sodium and calcium hydroxides) and an oxidative (alkaline hydrogen peroxide). The liquid fractions resulting from these pre-treatments were reused up to five times. After each pre-treatment cycle, the solid fraction was hydrolyzed with Celluclast 1.5L enzyme in a 1:10 solid-liquid ratio. Sulfuric and oxalic acids solubilized 80% of the hemicellulose over the cycles. Sodium and calcium hydroxides and hydrogen peroxide removed lignin until the fourth cycle. About 70% of lignin were removed with alkaline hydrogen peroxide. This pre-treatment lead to the highest glucose release after the enzymatic hydrolysis, above 50% in the three cycles analyzed. The best efficiency in enzymatic hydrolysis followed the order H2O2-alkaline NaOH oxalic acid phosphoric acid H2SO4 citric acid Ca (OH)(2). With the recycling, more than 62% in reagents used in the pre-treatment of sugarcane bagasse were saved, enabling an economy in the costs at this stage of the process. (C) 2021 Elsevier Ltd. All rights reserved.
机译：预处理木质纤维素生物量是一种主要的技术挑战。回收液体馏分可以减少化学输入和用水，但效率可能较低。比较七种化学预处理甘蔗甘蔗渣：四个酸（硫酸，柠檬酸，磷酸盐和草），两种碱性（氢钠和氢氧化钙）和氧化（碱性过氧化氢）。由这些预处理产生的液体级分可重复使用高达五次。在每次预处理循环之后，用1:10固液比用细胞克拉特1.5L酶水解固体级分。硫酸和草酸溶解在循环上的80％的半纤维素。钠和氢氧化钙和过氧化氢除去木质素直至第四个循环。将约70％的木质素用碱性过氧化氢除去。这种预处理导致酶水解后的最高葡萄糖释放，分析的三个循环中的50％以上。酶水解的最佳效率，然后是H2O2-碱＆GT的顺序。 naoh＆草酸＆磷酸＆ H2SO4＆GT;柠檬酸和 CA（OH）（2）。随着回收率，节省了62％以上的试剂，用于预处理甘蔗队甘蔗渣，在该过程的这种阶段实现了成本的经济。 （c）2021 elestvier有限公司保留所有权利。

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