Lignin Depolymerization via Ionic Liquid and Deep Eutectic Solvent Systems
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Solution Overview
Problem
The challenge in lignin valorization lies in its complex structure and heterogeneity, which complicates its fractionation and upgrading into value-added chemicals, particularly due to the addition of structural complexity during conversion processes, and the inefficiency of catalysts in retaining native properties during thermochemical and biochemical deconstruction methods.
Innovation Solution
A method involving the use of ionic liquids (ILs) and deep eutectic solvents (DES) in combination with catalysts or biocatalysts to facilitate the selective depolymerization of lignin, utilizing transition metal catalysts or biocatalysts like laccases to break down lignin into lower molecular weight compounds, such as phenolic monomers, in a controlled and efficient manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional extraction methods are used, then lignin can be obtained, but structural complexity is added during conversion processes
Solution Approach 1:
The patent employs ionic liquids and deep eutectic solvents with specific chemical compositions and properties to extract lignin under controlled conditions, changing the extraction parameters to achieve depolymerization while maintaining structural simplicity. The solvent system parameters (composition, temperature, pH) are optimized to prevent structural complexity addition.
2Productivity
If thermochemical deconstruction is used, then lignin can be converted, but catalyst efficiency is compromised due to structural complexity
Solution Approach 1:
The patent introduces ionic liquids and deep eutectic solvents as intermediary substances that facilitate the interaction between catalysts and lignin. These intermediaries create a favorable reaction environment that protects catalyst efficiency while enabling effective lignin conversion, bridging the gap between catalyst and complex lignin structure.
Solution Approach 2:
The reaction conditions (temperature, pressure, solvent composition) are precisely controlled and optimized to maintain catalyst efficiency. The patent adjusts operational parameters to prevent catalyst deactivation while achieving high conversion rates.
3Temperature
If biochemical deconstruction is used, then lower temperature processing is achieved, but product selectivity is reduced
Solution Approach 1:
The patent combines biochemical catalysts (enzymes) with ionic liquid/ deep eutectic solvent systems to create a composite processing environment. This composite approach maintains the low-temperature advantage of biochemical methods while enhancing product selectivity through the synergistic effects of the solvent system and catalyst.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the molecular weight of lignin, enhances the yield of valuable phenolic compounds, and improves the economic viability of biofuel production by maintaining the structural integrity of lignin, thereby overcoming the limitations of existing methods.
Implementation Method 1
contacting lignins with an ionic liquid (IL) or a deep eutectic solvent (DES) or a combination of both
Implementation Method 2
A catalyst is then added and then after sufficient time for decomposition valorized compounds can be extracted from the solvent mixture
Implementation Method 3
utilizing transition metal catalysts or biocatalysts like laccases to break down lignin into lower molecular weight compounds, such as phenolic monomers
Data Source
AI summary
This invention relates to a method for extracting valorized compounds from lignin by contacting lignins with an ionic liquid and/or a deep eutectic solvent and adding a catalyst and/or a biocatalyst to assist in breaking down the source material. Converting lignin into high value chemicals adds revenues for a bio-refinery and helps to improve the economic viability of biofuel production.