Phosphorylated Lignocellulose Nanofibrils via Lower-Energy Water Swelling
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Solution Overview
Problem
Existing methods for producing nanocellulose from phosphorylated lignocellulose fibers are energy-intensive, require expensive equipment, and have decreased efficiency beyond a phosphate charge threshold of 2500 mmoles/kg, leading to increased energy consumption and reduced yield.
Innovation Solution
A self-hydrolysis method involving hydrolyzing phosphorylated fibers in an aqueous medium at controlled temperatures and pH, followed by mechanical shear to isolate lignocellulose nanofibrils as hydrogel, using equipment that generates high shear stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure homogenizers and microfluidizers are used for nano-fibrillation, then nanocellulose can be produced, but energy consumption increases and equipment cost increases
Solution Approach 1:
The patent changes the chemical parameter of the fiber surface by introducing phosphate groups through esterification reaction. This chemical modification alters the physical properties of the fiber, enabling water to penetrate and swell the fiber structure, thereby facilitating nanofibrillation under milder mechanical conditions with lower energy consumption
Solution Approach 2:
Water acts as an intermediary substance that facilitates the nanofibrillation process. The phosphate groups on the fiber surface enhance water accessibility, allowing water to penetrate the fiber structure and act as a swelling agent, which reduces the mechanical energy required for fibrillation
2Strength
If phosphate content exceeds 2500 mmoles/kg, then fiber crosslinking increases, but nano-fibrillation efficiency decreases and energy consumption increases
Solution Approach 1:
The patent applies preliminary chemical modification by esterifying the fiber surface with phosphate groups before mechanical fibrillation. This preliminary action creates a more open fiber structure that is more susceptible to water penetration and mechanical breakdown, enabling efficient nanofibrillation even at higher phosphate contents that would otherwise cause excessive crosslinking
3Productivity
If chemical processes are used for nanocellulose isolation, then nanocellulose can be produced, but environmental pollution increases
Solution Approach 1:
The patent replaces aggressive chemical processes with a milder chemical modification (esterification) followed by mechanical fibrillation. The esterification step uses relatively benign reagents compared to traditional oxidation or acid hydrolysis methods, and the subsequent fibrillation relies on mechanical energy rather than harsh chemicals, thereby reducing environmental pollution
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 reduces energy consumption and equipment costs while maintaining high yield and efficiency, allowing production of nanocellulose with enhanced properties even at higher phosphate charges.
Implementation Method 1
hydrolyzing an amount of phosphorylated fibers in which the phosphorylated fibers include a phosphorylated lignocellulose
Implementation Method 2
The water can go as far as breaking the dense bundle of hydrogen bonds if the phosphorylated fibers are subjected simultaneously to a high-shear mechanical action
Implementation Method 3
applying a mechanical shear force to the previously treated fibers, in a second aqueous suspension, thereby isolating the lignocellulose nanofibrils
Data Source
AI summary
A method for producing lignocellulose nanofibrils from phosphorylated fibers. The method includes hydrolyzing an amount of phosphorylated fibers in which the phosphorylated fibers include a phosphorylated lignocellulose of Formula I: in which i) lignocellulose is selected from the group consisting of: lignin; hemicelluloses; and cellulose; and ii) n is greater than 0 but less than 8000 mmoles/kg. The phosphorylated fibers are dispersed in an aqueous medium at a first temperature to produce an aqueous dispersion having a consistency. The phosphorylated fibers are dispersed for a predetermined time so as to enhance/increase water accessibility to the fiber wall, thereby causing fiber swelling.