Purification of Kraft cellulose under mild conditions using choline acetate based deep eutectic solvents,Green Chemistry

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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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