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Purification of Kraft cellulose under mild conditions using choline acetate based deep eutectic solvents
Green Chemistry ( IF 9.3 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0gc03375h
Greta Colombo Dugoni 1, 2, 3, 4 , Andrea Mezzetta 4, 5, 6, 7 , Lorenzo Guazzelli 4, 5, 6, 7 , Cinzia Chiappe 4, 5, 6, 7 , Monica Ferro 1, 2, 3, 4 , Andrea Mele 1, 2, 3, 4, 8
Affiliation  

Three novel deep eutectic solvents (DESs) were prepared with choline acetate (ChOAc) as the hydrogen bond acceptor (HBA) and three hydrogen bond donors (HBD): glycolic acid (GlyA), levulinic acid (LevA) and imidazole (Im). They showed different, albeit remarkable capabilities of dissolving lignin (from 35% to 100%) and hemicellulose (from 40% to 50%). The solubility was first tested on commercially available hemicellulose in neat DES and in DES aqueous solution. The high values of solubility observed (22–45 wt%) demonstrated the potential of DESs as hemicellulose solvents. A proof of concept test was carried out on Kraft cellulose: our systems provided selective solubilisation of lignin and hemicellulose leading to cellulose purification, as demonstrated by the lignocellulosic content before and after the DES treatment.

中文翻译:

在温和条件下使用乙酸胆碱基深共熔溶剂纯化牛皮纸纤维素

用醋酸胆碱(ChOAc)作为氢键受体(HBA)和三个氢键供体(HBD)制备了三种新型的深共晶溶剂(DESs):乙醇酸(GlyA),乙酰丙酸(LevA)和咪唑(Im)。它们显示出不同的溶解木质素(从35%到100%)和半纤维素(从40%到50%)的出色能力。首先在纯DES和DES水溶液中在市售半纤维素上测试溶解度。观察到的高溶解度值(22–45 wt%)证明了DESs作为半纤维素溶剂的潜力。对牛皮纸纤维素进行了概念验证测试:我们的系统提供了木质素和半纤维素的选择性增溶作用,从而导致了纤维素的纯化,这由DES处理前后木质纤维素含量证明。
更新日期:2020-11-25
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