Selective Separation of Wood Components Based on Hansen’s Theory of Solubility

Abstract

A new method for selective separation of wood components is presented. Based on Hansen's theory of solubility, ionic liquid (IL) 1-butyl-3-methylimidazolium bromine ([Bmin]Br) was mixed with aqueous ethanol. HBr the acid catalyst in the degradation of wood components, was found to form in situ by ion exchange between IL and organic acid. The hydrogen bonding capacity of the mixture was enhanced as the presence of IL, which led to the promotion of the solubilization of lignin and other products from carbohydrates hydrolysis. The data showed that, variations of the IL concentration caused cellulose to be separated from pine wood with a purity of more than 94%, or to be hydrolyzed and converted into saccharides together with hemicellulose. Because of the complete hydrolysis of hemicellulose, the cross-linked matrix of lignin and hemicellulose was destroyed, which led to the isolation of lignin with a high purity of about 93%.

Deep Eutectic Solvents (DESs) for the Isolation of Willow Lignin (Salix matsudana cv. Zhuliu)

“…Several studies have illustrated that DESs with high H-bond accepting ability and polarity would contribute to dissolving lignin [ 20 ]. Compared to glycerol and urea, lactic acid had more suitable solution parameter values according to Hansen’s theory of dissolution [ 21 ]. All these showed that the ChCl-Lac treatment was found to be much more suitable compared to ChCl-Gly and ChCl-U.…”

A predictive toolset for the identification of effective lignocellulosic pretreatment solvents: a case study of solvents tailored for lignin extraction

“…The RED is defined as the ratio between the radius of interaction (R a ) to the 3D sphere radius of the solute (R 0 ) as shown in the below eqn ( 15) and ( 16). 27,35,84,85…”

Manufacture of Platform Chemicals from Pine Wood Polysaccharides in Media Containing Acidic Ionic Liquids

“…The experimental results determined in this study were typical for pine wood, and lie in the ranges reported for Pinus pinaster [ 4 , 5 , 7 , 8 , 10 , 11 , 12 ], Pinus taeda [ 53 ], Pinus sylvestris [ 13 , 47 ] and Pinus spp. from China [ 54 ].…”