Switchable Ionic Liquids for Biomass Pretreatment
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Solution Overview
Problem
The economic viability of biofuels from lignocellulosic biomass is limited by the recalcitrant nature of lignocellulosic biomass to enzymatic hydrolysis, requiring energy-intensive pretreatment processes, and existing ionic liquid pretreatments are costly and can destabilize enzymes and inhibit microbial growth.
Innovation Solution
A method using dicarboxylic acid-based ionic liquids that switch from a basic solution for biomass pretreatment to an acidic solution compatible with enzymes, allowing high biomass conversion to fermentable sugars, and enabling microbial fermentation without the need for extensive washing or enzyme stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermo-chemical pretreatment processes are used to open up biomass structure, then accessibility to carbohydrate components is improved, but energy input and equipment complexity increase
Solution Approach 1:
The patent uses ionic liquids with specific chemical compositions and pH ranges (pH 2-7) to dissolve biomass at lower temperatures (50-150°C) compared to conventional high-temperature thermo-chemical processes. The ionic liquid composition parameters are optimized to achieve effective biomass pretreatment under milder conditions, reducing energy input while maintaining or improving carbohydrate accessibility.
Solution Approach 2:
Ionic liquids serve as intermediary solvents that facilitate biomass dissolution and structure opening without requiring the extreme conditions of conventional pretreatment. The ionic liquid acts as a mediator between the biomass and subsequent enzymatic hydrolysis, enabling effective pretreatment at lower energy inputs while maintaining high carbohydrate accessibility.
2Productivity
If ionic liquids are used for biomass pretreatment, then biomass solubilization and enzymatic hydrolysis rate are improved, but cost and time consumption increase
Solution Approach 1:
The patent optimizes ionic liquid composition parameters including pH (2-7), temperature (50-150°C), and liquid-to-biomass ratios to achieve rapid biomass dissolution and high enzymatic hydrolysis rates. By carefully controlling these parameters, the process achieves effective pretreatment in reduced timeframes compared to conventional methods, while maintaining high productivity.
3Productivity
If ionic liquids are used for pretreatment, then biomass conversion to sugars is improved, but enzyme stability and microbial growth are compromised
Solution Approach 1:
The patent carefully controls ionic liquid pH within the range of 2-7 and temperature between 50-150°C to maintain enzyme stability while achieving high biomass conversion. These parameter optimizations ensure that the ionic liquid effectively pretreats biomass for high sugar yield without destabilizing subsequent enzymatic hydrolysis enzymes or inhibiting microbial fermentation.
Solution Approach 2:
The ionic liquid serves as an intermediary that enables effective biomass pretreatment while being removed or neutralized before enzyme addition. This intermediary role allows the system to achieve high biomass conversion during pretreatment while protecting enzyme stability and microbial growth in subsequent steps.
4Productivity
If existing ionic liquid pretreatment methods are used, then biomass dissolution is achieved, but extensive washing and enzyme stabilization are required
Solution Approach 1:
The patent optimizes ionic liquid composition and pH parameters to enable effective biomass dissolution that is inherently compatible with subsequent enzymatic hydrolysis. By controlling the ionic liquid properties within specific ranges, the process eliminates the need for extensive washing steps and enzyme stabilization measures, simplifying the overall process while maintaining high biomass dissolution efficiency.
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 method achieves high conversion of biomass to fermentable sugars, stabilizes commercial enzyme mixtures, and is compatible with microbial fermentation, reducing costs and energy inputs while maintaining fermentation efficiency.
Implementation Method 1
forming a mixture including polysaccharide biomass and an ionic liquid solution, wherein the ionic liquid solution contains water and an ionic liquid... maintaining the mixture under conditions sufficient to dissolve at least a portion of the polysaccharide present in the polysaccharide biomass
Implementation Method 2
adding at least one glycoside hydrolase to the mixture having the reduced pH... maintaining the mixture containing the glycoside hydrolase under conditions sufficient to hydrolyze at least a portion of the dissolved polysaccharide, thereby forming the sugar composition
Data Source
AI summary
In one aspect, the present invention provides a method for preparing a sugar composition. The method includes: forming a mixture including polysaccharide biomass and an ionic liquid solution, wherein the ionic liquid solution contains water and an ionic liquid, and wherein the ionic liquid contains a dicarboxylic acid anion and a cation. The pH of the mixture is greater than or equal to about 10, and the molar ratio of the dicarboxylic acid anion to the cation is at least about 1:2. The method further includes: maintaining the mixture under conditions sufficient to dissolve at least a portion of the polysaccharide present in the polysaccharide biomass; reducing the pH of the mixture containing the dissolved polysaccharide to at least about 7; adding at least one glycoside hydrolase to the mixture having the reduced pH.