Lignocellulosic Biomass Fractionation via Selective Solvent Extraction
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Solution Overview
Problem
Current methods for separating lignin from lignocellulosic materials often result in contaminated products due to the simultaneous removal of lignin, hemicellulose, and lignin-carbohydrate complexes (LCC) at high temperatures, leading to degraded lignin structure and contamination of hemicellulose products, making it difficult to achieve pure sugar-free lignin and LCC isolation.
Innovation Solution
A method involving the use of an organic aqueous solution with a water miscible solvent, such as ethanol, at moderate temperatures to selectively extract sugar-free lignin while retaining LCC and hemicellulose in the solid cellulosic material, followed by separate extraction and isolation of LCC from the enriched cellulosic material, avoiding high-temperature treatments and enzymatic steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature treatment is used to remove lignin, then delignification efficiency is improved, but lignin structure is degraded and product purity deteriorates
Solution Approach 1:
The patent changes the temperature parameter from high temperature (conventional pulping) to moderate temperature (60-100°C) to preserve lignin structure while maintaining delignification efficiency through the use of specific organic solvents that enhance extraction at lower temperatures
Solution Approach 2:
The patent replaces thermal energy (heat) with chemical energy (organic solvents) as the primary mechanism for lignin extraction, substituting thermal degradation with solvent-based selective dissolution to maintain lignin structural integrity
2Productivity
If simultaneous removal of lignin, hemicellulose and LCC is performed, then delignification speed is improved, but product separation and purity are worsened
Solution Approach 1:
The patent segments the delignification process into multiple stages: first removing lignin with organic solvents at moderate temperature, then separately extracting hemicellulose and LCC in subsequent steps, allowing each component to be isolated with high purity while maintaining overall process efficiency
Solution Approach 2:
The patent uses organic solvents as intermediary substances that selectively interact with lignin first, creating a separation sequence where different biomass components are extracted in a controlled order based on their differential solubility and binding characteristics
3Productivity
If sulfur containing reagents are used for delignification, then lignin removal efficiency is improved, but lignin purity and application quality are worsened
Solution Approach 1:
The patent replaces persistent sulfur-containing reagents with disposable organic solvents that can be easily removed by evaporation, achieving effective lignin extraction without introducing contaminants that would require additional purification steps
Solution Approach 2:
The patent changes the chemical composition parameter of the extracting agent from sulfur-based compounds to organic solvents, fundamentally altering the extraction mechanism to be non-contaminating while maintaining or improving lignin extraction 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 approach allows for the high-purity extraction of sugar-free lignin and LCC, enabling their utilization in synthetic polymers and maintaining the integrity of hemicellulose, thereby improving the overall biomass recovery and product quality.
Implementation Method 1
extracting sugar free lignin from the lignocellulosic biomass by contacting the biomass with an organic aqueous solution comprising water and at least one water miscible organic solvent
Implementation Method 2
separating the sugar free lignin solution from the biomass-solvent suspension
Implementation Method 3
extracting the lignin carbohydrate complexes from the cellulosic material enriched with lignin carbohydrate complexes and hemicellulose by contacting the cellulosic material with water or an aqueous solution
Data Source
AI summary
A method for the isolation of lignin from a lignocellulosic biomass, comprising providing a lignocellulosic biomass; extracting sugar free lignin from the lignocellulosic biomass by contacting said biomass with an organic aqueous solution comprising water and at least one water miscible organic solvent, either discontinuously or continuously, whereby a biomass-solvent suspension is formed; separating the sugar free lignin solution from the biomass-solvent suspension to obtain a sugar free lignin solution and a cellulosic material enriched with lignin carbohydrate complexes and hemicellulose, and optionally isolating sugar free lignin from the sugar free lignin solution; extracting the lignin carbohydrate complexes from the cellulosic material enriched with lignin carbohydrate complexes and hemicellulose by contacting said cellulosic material with a liquid comprising at least water, whereby treated biomass suspension is formed; separating the lignin carbohydrate complexes solution from said treated biomass suspension to obtain a lignin carbohydrate complexes solution and cellulosic material enriched with hemicellulose, and, optionally isolating lignin carbohydrate complexes from the solution obtained and isolating further sugar free lignin from the mother liquor of said lignin carbohydrate complexes isolation, optionally after combining the mother liquor of said lignin carbohydrate complexes isolation with the sugar free lignin solution obtained from extracting sugar free lignin from the lignocellulosic biomass.