Delignified Cellulose Fiber Extraction for Stronger Plant Macrofibers
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Solution Overview
Problem
Conventional methods struggle to efficiently extract cellulose-based macrofibers from natural plant materials due to the complex matrix of lignin and hemicellulose, which damages the cellulose and limits its mechanical properties.
Innovation Solution
A 'top-down' method involving a two-step or single-step delignification process using chemical treatments to selectively remove lignin and hemicellulose, followed by rinsing and drying, resulting in the extraction of intact cellulose-based macrofibers with enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional extraction methods are used to remove lignin and hemicellulose, then the extraction process can be completed, but the fibers suffer damage and have low mechanical properties
Solution Approach 1:
The patent applies parameter changes by optimizing chemical treatment conditions (concentration, temperature, time) to achieve effective delignification while minimizing fiber damage. By carefully controlling these parameters, the process removes lignin and hemicellulose effectively while preserving fiber integrity and mechanical properties.
Solution Approach 2:
The patent replaces mechanical extraction methods with chemical delignification processes. Instead of using mechanical force that causes fiber damage, the invention uses chemical treatments to selectively remove lignin and hemicellulose, thereby obtaining intact fibers with high mechanical properties.
2Reliability
If effective delignification is achieved, then lignin and hemicellulose are removed, but the process complexity increases
Solution Approach 1:
The patent segments the delignification process into distinct stages or steps, each targeting specific components (lignin, hemicellulose). This segmentation allows for more effective and controlled removal of different cell wall components while managing process complexity through systematic progression.
Solution Approach 2:
The patent employs intermediary substances or agents that facilitate the delignification process. These intermediaries enable selective removal of lignin and hemicellulose while protecting the cellulose fibers, thereby achieving effective delignification without excessive process complexity.
3Strength
If chemical treatments are applied to remove lignin, then fiber quality improves, but processing time and cost increase
Solution Approach 1:
The patent applies partial action by using chemically treated solutions that achieve sufficient delignification without excessive treatment time. By optimizing the degree of chemical treatment to be just sufficient for effective delignification, the process reduces time loss while maintaining fiber quality.
Solution Approach 2:
The patent utilizes parameter changes by adjusting chemical treatment conditions (temperature, concentration, exposure time) to achieve optimal delignification efficiency. By fine-tuning these parameters, the process minimizes processing time while still achieving high fiber quality and effective lignin removal.
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
The method produces delignified macrofibers with improved tensile strength and Young's modulus, suitable for use as structural components or reinforcement in composites, while maintaining a high cellulose content and minimizing damage.
Implementation Method 1
the natural plant material is treated with an alkali solution of one or more chemicals in order to partially remove lignin and hemicellulose from the plant material
Implementation Method 2
subsequent drying of the released macrofibers can result in self-densification, which can further improve the mechanical properties of the macrofibers
Data Source
AI summary
A piece of natural plant material is subjected to one or more chemical treatments to remove substantially all lignin therefrom, thereby allowing the extraction of delignified, cellulose-based fibers. For example, the natural plant material can be a grass, such as bamboo or gladiolus. Subsequent drying of the extracted fiber densifies the structure, yielding improved mechanical properties. In some embodiments, the extracted fibers can be used, either alone or in combination with other materials, as a structural material. For example, the extracted fibers can be embedded within, infiltrated with, coated by, or otherwise combined with a polymer or concrete to form a composite material.