Kamlet-Taft Parameters of Deep Eutectic Solvents and Their Relationship with Dissolution of Main Lignocellulosic Components

Deep eutectic solvents (DESs) have attracted significantinterestin dissolving lignocellulosic components. However, revealing the relationshipbetween the solvation properties of DESs and their ability to dissolvelignocellulosic components remains a significant challenge. Herein,56 DESs were prepared and applied to dissolve lignocellulosic components.This revealed that the Kamlet-Taft parameters (i.e., & alpha;,& beta;, and & pi;*) were significantly affected by the structuresof DESs. More notably, the correlation between Kamlet-Taftparameters and solubility varied with DESs and lignocellulosic components.Concretely, DESs have greater values of & beta; and & beta;-& alpha;(net basicity), are expected to dissolve cellulose efficiently, havegreater net basicity, and are favorable to dissolve lignin, and thesolubility of xylan was linearly correlated with the & beta; value.These findings provided valuable information and necessary theoreticalguidance on designing robust DESs to dissolve lignocellulosic componentsbased on Kamlet-Taft solvatochromic parameters.

Automated summary

In this study, 56 deep eutectic solvents (DESs) were prepared and applied to dissolve lignocellulosic components. It was found that the structures of DESs significantly affected the Kamlet-Taft parameters. The correlation between Kamlet-Taft parameters and solubility varied with DESs and lignocellulosic components. DESs with greater values of β and β-α (net basicity) were expected to efficiently dissolve cellulose, while those with greater net basicity were favorable for dissolving lignin. The solubility of xylan was linearly correlated with the β value. These findings provided valuable information and necessary theoretical guidance for designing robust DESs to dissolve lignocellulosic components based on Kamlet-Taft solvatochromic parameters.