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Related Experiment Video

Updated: Apr 25, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Lignin dissolution in dialkylimidazolium-based ionic liquid-water mixtures.

Yantao Wang¹, Ligang Wei¹, Kunlan Li¹

¹School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.

Bioresource Technology

|August 29, 2014

Summary

Ionic liquid-water mixtures effectively dissolve lignin, with optimal solubility at 70% ionic liquid content for most types. Hansen solubility parameters help predict optimal IL content but not IL type effects on lignin dissolution.

Keywords:

Dissolution Ionic liquid–water Lignin Solubility parameter

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Published on: June 1, 2018

Area of Science:

Biomass Conversion
Green Chemistry
Materials Science

Background:

Lignin, a complex aromatic polymer, is a major component of lignocellulosic biomass.
Efficient lignin valorization is crucial for sustainable biorefining and the development of bio-based products.
Ionic liquids (ILs) offer tunable properties for biomass processing, including lignin dissolution.

Purpose of the Study:

To investigate the effect of ionic liquid (IL) content and type on lignin solubility in IL-water mixtures.
To determine the optimal IL concentration for maximum lignin dissolution.
To evaluate the applicability of Hansen solubility parameters (HSP) in predicting lignin solubility.

Main Methods:

Lignin dissolution experiments were conducted in dialkylimidazolium-based IL-water mixtures at varying IL concentrations (40-100 wt%) and a constant temperature (60°C).
The influence of different IL cations and anions on lignin solubility was systematically studied.
Hansen solubility parameter (HSP) theory was applied to correlate with experimental findings.

Main Results:

Lignin solubility was significantly influenced by both IL content and type.
Maximum lignin solubility was observed at 70 wt% IL content for most IL-water mixtures, except for [C4C1im]BF4.
A clear trend in lignin solubility was established based on IL cation and anion variations, with specific orders provided.
HSP successfully predicted the optimal IL content range but could not account for the effect of IL type on solubility.

Conclusions:

Dialkylimidazolium-based IL-water mixtures are effective solvents for lignin dissolution.
Optimizing IL concentration is key to maximizing lignin solubility, with 70 wt% often being optimal.
While HSP aids in predicting optimal IL content, further theoretical approaches are needed to understand the specific impact of IL structure on lignin solubility.