Cellulosic Material Compression for Impregnation
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Solution Overview
Problem
The pre-treatment of cellulosic materials for hydrolysis is challenging due to variability in impregnation results, particularly with lignocellulosic materials, where lignin protects the cellulose, making it difficult to control and predict the effectiveness of impregnation with reactive gases like SO2 or CO2.
Innovation Solution
Compressing the cellulosic material before impregnation with a reactive gas in an impregnation chamber, which increases dry matter content and specific surface area, facilitating more efficient penetration and impregnation, while using a plug screw feeder to control the compression and ensure consistent results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cellulosic material is treated with reactive gas without compression, then the process is simpler, but the impregnation results are variable and unpredictable
Solution Approach 1:
The cellulosic material is compressed before impregnation with the reactive gas. This preliminary compression action stabilizes the material structure and increases its dry matter content, which subsequently leads to more predictable and reliable impregnation results. The compression is performed in a compression device before the material enters the impregnation chamber.
2Reliability
If cellulosic material is compressed before impregnation, then impregnation efficiency and predictability improve, but device complexity increases
Solution Approach 1:
The compression device and impregnation chamber are integrated into a single system where the compression device is positioned directly before the impregnation chamber. This merging of functions reduces the need for separate, standalone compression and impregnation units, thereby reducing overall system complexity while maintaining the benefits of pre-compression.
Solution Approach 2:
The plug screw feeder automatically performs both compression and feeding functions in a single mechanism. The screw mechanism compresses the material as it conveys it into the impregnation chamber, eliminating the need for separate compression and feeding devices.
3Loss of substance
If cellulosic material is compressed to increase dry matter content, then gas consumption decreases, but energy input increases
Solution Approach 1:
The compression process changes the physical parameters of the cellulosic material, specifically increasing its dry matter content and density. This parameter change allows the material to absorb reactive gas more efficiently, reducing gas consumption. The compression is performed to an optimized degree that balances energy input with gas savings.
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 enhances the predictability and efficiency of impregnation, reducing gas consumption and stabilizing the properties of the material, leading to improved hydrolysis outcomes and increased dry matter content, thereby facilitating the production of target chemicals like ethanol from cellulose.
Implementation Method 1
the cellulosic material is compressed when transferred to the impregnation chamber
Implementation Method 2
impregnating the cellulosic material with a reactive water-soluble gas
Implementation Method 3
reactive water-soluble gas, which is reactive in itself or when dissolved in water
Implementation Method 4
heating the impregnated material to obtain pre-treated material
Data Source
AI summary
A method of pre-treating a cellulosic material before hydrolysis is provided. The method comprises the steps of: impregnating the cellulosic material with a reactive water-soluble gas, such as sulphur dioxide (SO2) or carbon dioxide (CO2), in an impregnation chamber to obtain impregnated material; and heating the impregnated material to obtain pre-treated material, wherein the cellulosic material is compressed right before or when it is transferred to the impregnation chamber. A corresponding system is also provided.