Lignocellulose Fractionation via Sequential Solvent Extraction
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Solution Overview
Problem
Current methods for fractionating lignocellulose-based biomass, such as steam explosion and dilute-acid hydrolysis, face inefficiencies due to high energy consumption, low yield, and the generation of fermentation inhibitors like furfural, which hinder enzymatic saccharification and fermentation processes.
Innovation Solution
A method and apparatus using two solvents to continuously fractionate lignocellulose-based biomass, where lignin is primarily extracted with a basic solvent like aqueous ammonia, followed by xylose extraction with an acidic solvent, allowing for sequential extraction of lignin, xylose, and cellulose in a single reaction vessel under mild conditions, reducing enzyme usage and inhibitor generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If steam explosion or dilute-acid hydrolysis is used for fractionating lignocellulose, then the biomass can be pretreated to enable sugar production, but high energy consumption and generation of fermentation inhibitors occur
Solution Approach 1:
The patent changes the chemical parameters by using aqueous ammonia (basic condition) instead of acid or steam, enabling fractionation at lower temperatures and pressures while avoiding the formation of fermentation inhibitors like furfural that occur in conventional acid-based methods
Solution Approach 2:
The patent extracts and removes lignin from the lignocellulose biomass using aqueous ammonia, separating it from the cellulose and hemicellulose components. This extraction approach allows selective removal of inhibitory components without the harsh conditions required by traditional methods
2Quantity of substance
If dilute-acid hydrolysis is used to hydrolyze hemicellulose, then xylose can be produced, but fermentation inhibitors like furfural are generated that hinder subsequent fermentation
Solution Approach 1:
The patent performs preliminary delignification using aqueous ammonia before acid hydrolysis. This preliminary action removes lignin and prevents its degradation into phenolic compounds that would inhibit fermentation, while also protecting hemicellulose from excessive acid exposure that would generate furfural
Solution Approach 2:
The patent uses the basic properties of aqueous ammonia to selectively dissolve and remove lignin, converting the potential harm of lignin degradation into a benefit by preventing inhibitor formation. The ammonia treatment protects hemicellulose integrity while enabling subsequent efficient xylose release
3Ease of manufacture
If conventional fractionation methods are used, then biomass can be processed, but the process requires multiple steps and separate vessels increasing complexity
Solution Approach 1:
The patent merges delignification and fractionation operations into a single reaction vessel by sequentially adding aqueous ammonia followed by acid. This combination eliminates the need for separate pretreatment and hydrolysis vessels, reducing process complexity while maintaining effective fractionation of lignin, hemicellulose, and cellulose
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 enhances process efficiency, increases xylose yield, and minimizes the production of fermentation inhibitors, enabling direct utilization of xylose and cellulose in fermentation processes with reduced enzyme requirements and operational costs.
Implementation Method 1
extracting lignin by adding a first solvent for dissolving the lignin
Implementation Method 2
extracting xylose by adding a second solvent for dissolving hemicellulose
Data Source
AI summary
A method and apparatus for fractionating a lignocellulose-based biomass are provided. The method includes providing a lignocellulose-based biomass, extracting lignin from the biomass by adding a first solvent capable of dissolving the lignin, extracting xylose by adding a second solvent capable of dissolving hemicellulose to the biomass treated with the first solvent, and extracting the cellulose remaining in the biomass. In this method, a continuous process can be performed instead of a low efficiency batch-type process and components of the biomass can be obtained at high yield.