Lignin Separation Using Solid Additives in Biorefinery Fractionation
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Solution Overview
Problem
Current biomass fractionation processes often result in the degradation of one or more components, such as lignin or hemicellulose, to achieve high yields of others, leading to inefficient separation and utilization of cellulose, hemicellulose, and lignin, which are essential for various industrial applications.
Innovation Solution
A process involving the use of a solvent for lignin, sulfur dioxide, and water to fractionate lignocellulosic biomass, followed by the introduction of a solid additive like gypsum to combine with lignin, facilitating its separation and reducing tackiness, thereby improving lignin recovery and avoiding precipitation issues during acidic hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional biomass pulping is used to produce cellulose, then cellulose is recovered in high yields, but lignin is primarily consumed by oxidation and hemicellulose sugars are mostly degraded
Solution Approach 1:
The patent changes the chemical parameters of the pulping process by using organosolv chemistry with specific solvent systems (e.g., ethanol-water-amine mixtures) and controlled pH levels, allowing simultaneous recovery of cellulose, hemicellulose, and lignin without degradation. This parameter change enables the process to achieve high yields of all three components rather than sacrificing lignin and hemicellulose for cellulose production.
Solution Approach 2:
The patent introduces specific intermediary chemicals (such as amine compounds, organic solvents, and buffering agents) that mediate the interaction between the pulping chemicals and biomass components. These intermediaries protect lignin and hemicellulose from degradation while enabling cellulose recovery, thus resolving the contradiction between high cellulose yield and preservation of other components.
2Productivity
If severe chemistry is used to make cellulose reactive, then cellulose becomes more accessible for hydrolysis, but the integrity of cellulose and yields of hemicellulose and lignin are jeopardized
Solution Approach 1:
The patent modifies the chemical parameters of the pulping process to achieve a balance between cellulose accessibility and integrity. By controlling pH, temperature, and solvent composition, the process makes cellulose sufficiently accessible for hydrolysis while preserving its structural integrity and preventing degradation of hemicellulose and lignin.
Solution Approach 2:
The patent implements a continuous process where the organosolv chemistry maintains favorable conditions throughout the pulping operation, continuously protecting all three biomass components while progressively improving cellulose accessibility. This continuous action avoids the need for severe intermittent chemistry that would compromise integrity.
3Productivity
If one or two major components are recovered in high yields, then economic recovery is achieved, but not all three components can be recovered
Solution Approach 1:
The patent develops a universal pulping process that simultaneously serves multiple functions: recovering cellulose, hemicellulose, and lignin in high yields. The organosolv chemistry system is designed to handle all three components effectively, making the process versatile enough to achieve complete fractionation rather than focusing on just one or two components.
Solution Approach 2:
The patent uses precise parameter control (pH, temperature, solvent ratios, residence time) to optimize the simultaneous recovery of all three major biomass components. By adjusting these parameters, the process achieves high yields for cellulose, hemicellulose, and lignin together, rather than sacrificing some components to maximize others.
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 the simultaneous high-yield separation of cellulose, hemicellulose, and lignin, maintaining the integrity of cellulose for glucose production and reducing lignin-related processing challenges, thereby enhancing the efficiency and flexibility of biorefinery operations.
Implementation Method 1
introducing a solid additive to the liquor, wherein the solid additive combines with at least a portion of the lignin
Implementation Method 2
separating a mixture comprising the lignin and the solid additive, each in free or combined form, from the liquor
Implementation Method 3
catalyzing fractionation or hydrolysis with an acid to release sugars into an acidified solution containing lignin
Implementation Method 4
providing a feedstock comprising lignocellulosic biomass; in a digestor, fractionating the feedstock under effective fractionation conditions in the presence of a solvent for lignin
Data Source
AI summary
The present invention generally provides methods of improving lignin separation during biomass fractionation with an acid to release sugars and a solvent for lignin (such as ethanol). In some embodiments, a digestor is employed to fractionating a feedstock in the presence of a solvent for lignin, sulfur dioxide, and water, to produce a liquor containing hemicellulose, cellulose-rich solids, and lignin. A solid additive is added to the digestor, wherein the solid additive combines with at least a portion of the lignin. Then a mixture of lignin and the solid additive is separated from the liquor, prior to hemicellulose recovery. Optionally, a solid additive may also be introduced to a hydrolysis reactor for converting hemicellulose oligomers to monomers, to improve separation of acid-catalyzed lignin. In some embodiments, the solid additive is gypsum or a gypsum/lignin mixture.