Biomass Fractionation via Mild Refining and Chemical Treatment
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Solution Overview
Problem
Current pretreatment methods for lignocellulosic biomass, such as mechanical pulping, are energy-intensive and inefficient in separating hemicellulose and lignin, limiting the production of value-added bioproducts and biofuels.
Innovation Solution
A low-pressure mechanical refining process combined with mild chemical treatment to disintegrate lignocellulosic biomass, facilitating the separation and fractionation of hemicellulose, cellulose, and sulfur-free lignin, while minimizing energy consumption and chemical use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical pulping is used for lignocellulosic biomass pretreatment, then fiber separation is achieved, but energy consumption increases significantly (up to 4000 kWh/t)
Solution Approach 1:
The patent divides the biomass processing into distinct stages: low-energy mechanical refining for initial fiber separation, followed by chemical treatment for hemicellulose removal and lignin modification. This segmentation allows each stage to perform its specific function efficiently without requiring excessive energy at any single step.
Solution Approach 2:
The patent replaces high-energy mechanical pulping with a combination of low-energy mechanical refining followed by chemical treatment. The chemical processes (alkaline extraction, enzymatic treatment) substitute for the mechanical force that would otherwise be required to achieve complete fiber separation and component delignification.
2Productivity
If conventional mechanical refining is used, then biomass is processed, but hemicellulose and lignin separation is inefficient
Solution Approach 1:
The patent systematically extracts different biomass components through targeted chemical treatments: alkaline extraction removes hemicellulose, enzymatic treatment targets lignin, and organic solvent extraction isolates lignin and waxes. Each extraction step is designed to selectively remove specific components while preserving the cellulose structure.
Solution Approach 2:
The patent applies different chemical treatments to different aspects of the biomass processing: alkaline conditions for hemicellulose removal, enzymatic conditions for lignin modification, and organic solvents for lignin extraction. Each treatment is optimized for its specific target component, achieving high separation quality without compromising overall processing efficiency.
3Productivity
If high chemical concentrations are used for pretreatment (e.g., 8-10% bisulfite, 1.8-3.7% sulfuric acid), then hydrolysis efficiency is enhanced, but chemical consumption and environmental impact increase
Solution Approach 1:
The patent uses mild chemical concentrations (0.05-2% NaOH, 0.1-1% H2O2, 0.1-1% enzymes) and optimizes other parameters such as temperature (40-100°C), time (1-24 hours), and pH to achieve effective pretreatment. By changing the parameter组合 rather than relying on high chemical concentrations alone, the process achieves good hydrolysis efficiency with reduced chemical consumption.
Solution Approach 2:
The patent introduces intermediate treatment steps between mechanical refining and hydrolysis: alkaline treatment as an intermediary to remove hemicellulose and open up the cellulose structure, followed by enzymatic treatment as another intermediary to modify lignin. These intermediate steps facilitate subsequent hydrolysis without requiring high concentrations of harsh chemicals.
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 process enhances biofuel yields, produces high-quality sulfur-free lignin, and generates multiple value-added bioproducts with minimal refining energy and chemical input, making it a 'green' bioconversion method that can be easily integrated into existing mechanical pulp mills.
Implementation Method 1
mechanically refining the lignocellulosic biomass at a biomass consistency of 20% to 50% at 720 to 4320 MJ/t (200 to 1200 kWh/t) and a pressure of 100 to 600 kPa (1-6 bars)
Implementation Method 2
subjecting the biomass to a chemical treatment using a mild chemical selected from the group of mild acids and alkalis, enzymes and oxidants at a temperature in the range of 20 to 145°C for 1 to 30 minutes
Implementation Method 3
subjecting the biomass to a chemical treatment using a mild chemical selected from the group of mild acids and alkalis, enzymes and oxidants at a temperature in the range of 20 to 145°C for 1 to 30 minutes
Data Source
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AI summary
A fractionation process for producing value-added products from a lignocellulosic biomass, comprises: a) mechanically refining the lignocellulosic biomass under mild refining conditions to form a refined biomass pulp with enhanced susceptibility to separation of hemicellulose, cellulose and lignin, and enhanced digestibility of carbohydrates in hydrolysis b) separating hemicellulose and sulfur- free high-quality lignin from cellulose in the refined biomass, and, optionally c) producing various bioproducts from the above said process.