Lignocellulosic Sugar Purification via Amine Extraction and Ion Exchange
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Solution Overview
Problem
Efficient and cost-effective processes for extracting C5 and C6 sugars from lignocellulosic biomass are challenging due to the complexity of hydrolysates, which contain various components like methanol, acetic acid, and lignin, making separation and refining of sugars difficult.
Innovation Solution
The method involves contacting the sugar stream with an amine extractant to separate sugars from acids and impurities, using a combination of cation and anion exchangers, and fractional distillation to achieve high purity sugar streams, including xylose-enriched and cellulose sugar streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional hydrolysis methods are used to extract sugars from lignocellulosic biomass, then sugar extraction is achieved, but the hydrolysate becomes a complex solution containing multiple components (lignin, acids, methanol, sugars) that poses significant challenges in separation and refining
Solution Approach 1:
The patent segments the complex hydrolysate separation process into distinct stages: (1) removal of specific impurities like lignin and metals using selective adsorbents, (2) separation of organic acids from sugars using ion exchange resins, and (3) final sugar purification. This staged approach breaks down the overwhelming complexity into manageable steps, each targeting specific components.
Solution Approach 2:
The patent employs intermediary substances to facilitate separation: activated carbon or other adsorbents act as intermediaries to remove lignin and metals; ion exchange resins serve as intermediaries to separate organic acids from sugars. These intermediaries enable selective interactions that simplify the overall separation process.
2Manufacturing precision
If multiple separation steps are implemented to purify sugars from the complex hydrolysate, then sugar purity is improved, but the process complexity and cost increase
Solution Approach 1:
The patent merges multiple separation functions into integrated unit operations. For example, a single reactor system combines hydrolysis with in-situ separation capabilities, and ion exchange columns simultaneously remove multiple types of impurities. This consolidation reduces the number of discrete equipment items while maintaining high purification effectiveness.
Solution Approach 2:
The patent implements self-service mechanisms where the process system performs its own purification. The hydrolysate undergoes self-cleaning through controlled precipitation of impurities, and the separation system automatically regenerates its media (like ion exchange resins) without requiring separate complex regeneration equipment, thereby simplifying the overall 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 effectively purifies sugar streams, achieving high monomeric sugar content and reducing impurities, enabling the production of high-value products such as biofuels and chemicals from lignocellulosic biomass.
Implementation Method 1
contacting the sugar stream with an amine extractant to form a mixture; and separating from the mixture a first stream comprising the amine extractant and an acid or an impurity
Implementation Method 2
contacting the sugar stream with a strong acid cation exchanger to remove residual cations
Implementation Method 3
contacting the amine-removed hydrolysate with a weak base anion exchanger to form a neutralized hydrolysate
Implementation Method 4
removing diluent from the second stream using a packed distillation column
Data Source
AI summary
The present invention relates to methods of processing lignocellulosic material to obtain hemicellulose sugars, cellulose sugars, lignin, cellulose and other high-value products. Also provided are hemicellulose sugars, cellulose sugars, lignin, cellulose, and other high-value products.