Facile Directional Conversion of Cellulose and Bamboo Meal Wastes over Low-Cost Sulfate and Polar Aprotic Solvent,ACS Sustainable Chemistry & Engineering

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Facile Directional Conversion of Cellulose and Bamboo Meal Wastes over Low-Cost Sulfate and Polar Aprotic Solvent
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-31 , DOI: 10.1021/acssuschemeng.0c01280
Chao Liu ₁ , Min Wei ₁ , Jia Wang ₂ , Junming Xu _{1,

2} , Jianchun Jiang _{1,

2} , Kui Wang _{1,

2}

Affiliation

Directional depolymerization is a critical step for the integrated utilization of waste lignocellulosic biomass resources to produce value-added biofuels and biochemicals. Herein, we demonstrate an efficient and environmentally benign liquefied process for converting cellulose and waste lignocellulosic residues into levulinic acid (LA) in a polar aprotic solvent using a low-cost sulfate as catalyst. Due to the synergistic effect between the γ-valerolactone (GVL) and an active acid center derived from sulfate, more than 77 mol % and 61 mol % of biochemicals were obtained from cellulose and bamboo meal wastes in GVL/H₂O (m/m = 9:1) solvent at 200 °C for 2 h, respectively. A combination of ²⁷Al NMR spectroscopy and electrospray quadrupole time-of-flight tandem mass spectrometry (ESI-Q-TOF-MS/MS) revealed that the [Al(OH)₂(aq)]⁺ species significantly contributed to cellulose depolymerization under cationic polarization of polar aprotic solvents. Besides, the existence of an appropriate amount of water was believed to be responsible for promoting the destruction of cellulose and the restraint of humin formation. Notably, all solvents and byproducts could be efficiently retrieved during this process, which shed light on its considerable industrial application prospects and facilitated the high value-added utilization of waste biomass resources.

中文翻译：

低成本硫酸盐和极性非质子溶剂对纤维素和竹粕废料的简便定向转化

定向解聚是废物木质纤维素生物质资源综合利用以生产增值生物燃料和生化产品的关键步骤。在这里，我们展示了一种高效且环保的液化工艺，可使用低成本的硫酸盐作为催化剂，在极性非质子传递溶剂中将纤维素和废木质纤维素残留物转化为乙酰丙酸（LA）。由于γ戊内酯（GVL），并从硫酸衍生的活性的酸中心，多于77摩尔％和61摩尔％的生化物质之间的协同效应，从纤维素和竹餐废物GVL获得/ H ₂ O（米/ m = 9：1）的溶剂分别在200°C下放置2 h。组合²⁷Al NMR光谱和电喷雾四极杆飞行时间串联质谱（ESI-Q-TOF-MS / MS）显示，[Al（OH）₂（aq）] ⁺物种在极性阳离子阳离子极化下显着促进了纤维素的解聚非质子溶剂。此外，据信存在适量的水有助于促进纤维素的破坏和抑制人源素的形成。值得注意的是，在此过程中可以有效地回收所有溶剂和副产物，这阐明了其巨大的工业应用前景，并促进了废物生物质资源的高附加值利用。

更新日期：2020-03-31

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