Lignocellulosic Biomass Fractionation Using Recyclable Organic Solid Acids
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Solution Overview
Problem
Current methods for producing lignin-containing cellulose nanomaterials are energy intensive and lack surface functional groups for dispersion, and existing lignin nanoparticle production methods use environmentally harmful solvents, limiting their economical and sustainable utilization.
Innovation Solution
A method involving the use of sulfonic acid as a hydrotrope to dissolve lignin from lignocellulosic biomass at low temperatures and pressures, allowing for the production of lignin nanoparticles and cellulose-rich solids, which can be further processed into nanofibrils or nanocrystals, and the recovery of valuable chemicals like furfural.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct mechanical fibrillation is used to produce lignin-containing cellulose nanomaterials, then nanomaterials can be produced, but the process is energy intensive and does not produce surface functional groups for dispersion
Solution Approach 1:
The patent replaces direct mechanical fibrillation with a chemical treatment process using organic solid acids (such as sulfonic acids) to dissolve lignin and separate cellulose nanomaterials. This chemical substitution eliminates the need for high-energy mechanical grinding while simultaneously creating surface functional groups through the chemical action of the acid on the biomass surface.
Solution Approach 2:
The patent changes the chemical parameters of the treatment process by introducing organic solid acids with specific functional groups (sulfonic, carboxylic, phosphoric acids) that can chemically interact with lignin and cellulose. This parameter change enables low-energy processing while producing nanomaterials with enhanced surface properties for improved dispersion.
2Ease of manufacture
If conventional solvents are used to produce lignin nanoparticles, then lignin can be dissolved and processed, but environmentally harmful solvents are used
Solution Approach 1:
The patent employs biodegradable organic solid acids (such as citric acid, tartaric acid, and their salts) as temporary solvents that can be easily decomposed and removed. These environmentally benign alternatives replace persistent organic solvents, allowing lignin nanoparticle production while minimizing environmental harm through natural degradation pathways.
Solution Approach 2:
The patent creates an environmentally friendly processing environment by using water-based or biodegradable organic acid systems instead of toxic organic solvents. This inert, non-polluting environment enables lignin dissolution and nanoparticle formation without introducing harmful substances into the ecosystem.
3Productivity
If high temperatures are used for biomass fractionation, then lignin dissolution is efficient, but energy consumption increases
Solution Approach 1:
The patent substitutes thermal energy with chemical energy by using organic solid acids to catalyze lignin dissolution at lower temperatures. The chemical action of the acid on lignin bonds enables efficient separation without requiring high-temperature heating, thereby maintaining productivity while reducing energy consumption.
Solution Approach 2:
The patent changes the temperature parameter from high (conventional thermal processing) to low (chemical-assisted processing) by introducing organic solid acids. This parameter change maintains or improves lignin dissolution efficiency through chemical catalysis while dramatically reducing the thermal energy input required for the process.
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 enables efficient, low-energy, and low-cost production of lignin nanoparticles and cellulose nanomaterials with tunable morphology and surface properties, overcoming the limitations of existing methods by reducing environmental impact and improving material properties.
Implementation Method 1
A method involving the use of sulfonic acid as a hydrotrope to dissolve lignin from lignocellulosic biomass at low temperatures and pressures
Implementation Method 2
conversion of hemicellulosic sugars to furans using the organic solid acid as a catalyst
Data Source
AI summary
Methods of fractionating lignocellulosic biomass using hydrotropic sulfonic acids are provided. Also provided are methods of forming lignin particles, furans, sugars, and/or lignocellulosic micro- and nanofibrils from the liquid and solid fractions produced by fractionation process. The fractionation can be carried out at low temperatures with short reaction times.