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首页> 外文期刊>RSC Advances >Solvent-based delignification and decrystallization of wheat straw for efficient enzymatic hydrolysis of cellulose and ethanol production with low cellulase loadings
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Solvent-based delignification and decrystallization of wheat straw for efficient enzymatic hydrolysis of cellulose and ethanol production with low cellulase loadings

机译：小麦秸秆的基于溶剂的脱木质素和去结晶，可有效地酶促水解纤维素和乙醇，而纤维素酶含量低

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Several solvents and ionic liquids, namely formic acid (Formiline process), concentrated phosphoric acid (CPA), N-methylmorpholine-N-oxide (NMMO) and 1-allyl-3-methylimidazolium chloride ([AMIM]Cl), were used to pretreat wheat straw in order to increase cellulose digestibility for ethanol production. When being directly used to pretreat the raw wheat straw under corresponding optimized conditions, the improvement of cellulose hydrolyzability followed the order of CPA > Formiline > NMMO > [AMIM]Cl. However, when Formiline pretreated (delignified) substrates were further post-treated by the above cellulose solvents, the cellulose digestibility was significantly improved particularly with low cellulase loadings. Cellulose solvent post-treatment resulted in deconstruction of hydrogen-bond networking, alteration of cellulose polymorphs, decrease in crystallinity, depolymerization of cellulose chain with dramatic reduction in particle size, thus greatly increasing cellulose accessible surface area. CPA post-treatment showed the best efficacy. Semi-simultaneous scarification and fermentation (sSSF) of a CPA post-treated substrate obtained an ethanol concentration of 41.6 g L?1 with 91.2% of yield at a relatively low cellulase loading (5 FPU per g solid) within 24 h incubation. A biorefining process was proposed based on Formiline pretreatment coupled with CPA post-treatment to achieve a co-production of ethanol, furfural and high-purity lignin, which greatly increases the potential revenue of the process.
机译：几种溶剂和离子液体，分别是甲酸（甲酸法），浓磷酸（CPA）， N -甲基吗啉- N -氧化物（NMMO）和1-烯丙基- 3-甲基咪唑氯化物（[AMIM] Cl）用于预处理麦草，以提高纤维素消化率，以生产乙醇。当直接在相应的优化条件下对麦秸进行预处理时，纤维素水解性的改善顺序为CPA> Formiline> NMMO> [AMIM] Cl。但是，当用上述纤维素溶剂进一步对福米林预处理（去木质素）底物进行后处理时，尤其是在低纤维素酶负载下，纤维素的消化率得到了显着改善。纤维素溶剂的后处理导致氢键网络的破坏，纤维素多晶型物的改变，结晶度的降低，纤维素链的解聚以及粒径的显着减小，从而大大增加了纤维素可及的表面积。 CPA后处理显示出最佳疗效。 CPA后处理底物的半同时划痕和发酵（sSSF）在相对较低的纤维素酶条件下获得了41.6 g L ？1 乙醇浓度，产率为91.2％孵育24小时内加样（每克固体5 FPU）。提出了一种基于Formiline预处理和CPA后处理的生物精制工艺，以实现乙醇，糠醛和高纯度木质素的联产，从而大大增加了该工艺的潜在收益。

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