Introduction
Previous research on the IonoSolv process has highlighted its effectiveness in selectively extracting lignin from lignocellulosic biomass using ionic liquids (ILs). Studies have focused on the process's sustainability, cost efficiency, and recyclability, particularly in the pretreatment stages. However, these studies have predominantly concentrated on optimizing biomass fractionation and IL recycling, leaving significant gaps in understanding the downstream processes of filtration and drying. These steps are critical for ensuring lignin purity, structural integrity, and applicability for industrial use.
This thesis fills the research gap by systematically analyzing the effects of pre-filtration agitation and varying drying methods on lignin's physical and chemical properties. Through detailed examination, it offers insights into improving the scalability and consistency of lignin extraction, which were underexplored in previous studies.
Point 1
Pre-Filtration Agitation and Particle Size Optimization:
Previous research has acknowledged the role of agitation in enhancing enzyme-lignin interactions during extraction but lacked a detailed study on its impact during filtration. This thesis explores the effect of varying agitation speeds on lignin particle size and zeta potential, demonstrating how controlled pre-filtration agitation can improve filtration efficiency without compromising particle uniformity.
Point 2
Comprehensive Drying Process Evaluation:
Earlier studies briefly mentioned drying methods but did not assess their impact on lignin's structural integrity. This thesis investigates oven drying, vacuum drying, and freeze-drying techniques, revealing their influence on lignin's molecular structure, functional groups, and particle distribution. It provides evidence that freeze-drying preserves lignin's chemical properties better than high-temperature drying methods, which induce condensation and side-chain degradation.