Hemicellulose Extraction via Vacuum Impregnation and Recirculation
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Solution Overview
Problem
Existing methods for extracting hemicelluloses from lignocellulosic biomass, such as hot water extraction and steam explosion, result in low solids content, degradation, and contamination with lignin impurities, leading to economically unsound products and inefficient extraction processes.
Innovation Solution
A method involving the recirculation of extraction water through biomass under reduced pressure to minimize oxidation and degradation, using vacuum impregnation to remove oxygen and air, and reusing the extract for multiple extractions to increase concentration and purity without evaporation or expensive purification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional hot water extraction is used, then extraction process is simple, but the extract is highly diluted and contains lignin impurities
Solution Approach 1:
The patent implements continuous circulation of extraction water through the biomass in a closed loop system. The extract is continuously circulated through the biomass several times, allowing repeated extraction of hemicelluloses while concentrating the extract in place. This continuous action increases extract concentration from typical dilute levels to over 50 g/L without requiring evaporation or concentration steps.
Solution Approach 2:
The patent selectively extracts hemicelluloses from the lignocellulosic biomass while leaving lignin and other components in the solid phase. Through multiple circulation cycles, hemicelluloses are progressively removed and concentrated in the liquid phase, achieving separation without chemical additives. The circulating extract becomes enriched in hemicelluloses while lignin impurities remain adsorbed on the biomass or are excluded.
2Productivity
If traditional extraction methods are used, then extraction speed is fast, but oxidation and degradation of hemicelluloses occurs
Solution Approach 1:
The patent replaces air with nitrogen gas in the extraction system to create an inert atmosphere. Nitrogen is introduced to displace oxygen from the extraction vessel and circulation system, preventing oxidative degradation of hemicelluloses during the extraction process. This inert environment allows fast extraction while preserving the chemical integrity and molar mass of the extracted polysaccharides.
Solution Approach 2:
The patent performs preliminary saturation of the extraction water with nitrogen before beginning the extraction process. The water is sparged with nitrogen gas to remove dissolved oxygen and saturate with nitrogen, creating an oxygen-free extraction medium from the start. This preliminary action prevents oxidation during the entire extraction and circulation process.
3Quantity of substance
If water is removed to concentrate extract, then extract concentration increases, but expensive evaporation and purification steps are required
Solution Approach 1:
The patent uses the extraction water itself as the concentrating agent through repeated circulation. The same water extract is circulated through fresh or previously unextracted biomass multiple times, progressively concentrating hemicelluloses in place. This self-service approach concentrates the extract without requiring external evaporation equipment, achieving over 50 g/L concentration through multiple extraction cycles in the same liquid volume.
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 method effectively concentrates and purifies hemicellulose extracts with minimal water consumption, reducing oxidation and degradation, and increasing the energy value and suitability of the biomass for biofuel production and wood products, while maintaining high molar mass and consistency of the extracted polysaccharides.
Implementation Method 1
The concentration of the extract is increased by using the same extract in several extractions of new and previously un-extracted biomass. Removing air and oxygen from inside of the pores of the biomass during a impregnation step assisted by reduced pressure
Implementation Method 2
The circulating loop is vital in order for the non-hemicellulose material, such as lignin, to be adsorbed back to the biomass
Implementation Method 3
Method for extracting sugars and derivates thereof and the corresponding polysaccharides especially hemicelluloses from lignocellulosic biomass with hot water
Data Source
AI summary
Method for extraction of biomass with water in order to separate hemicelluloses from a fibrous structure. The biomass is impregnated under reduced pressure with the extraction fluid in order to prevent the degradation of the components to be extracted. During extraction the extract is circulated through the fiber matrix in order to remove unwanted components from the extract. The extract is reused for extracting untreated biomass in order to increase the consistency of the extract.