Oxidized Cellulose Dissolution via Swelling and Salt
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cellulose dissolution processes are cumbersome, expensive, and require harsh conditions, leading to degradation and limited solubility in common solvents, which hinders the full exploitation of cellulose potential.
Innovation Solution
A process involving the use of a polar aprotic solvent and a salt under an inert atmosphere, where cellulose is swelled and then contacted with the salt at specific temperature ranges to form a modified cellulose solution with minimized degradation, using solvents like N,N-Dimethylacetamide and lithium halides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cellulose dissolution processes are used, then cellulose can be dissolved, but the process becomes cumbersome and expensive requiring harsh conditions
Solution Approach 1:
The patent changes the chemical parameters by using oxidized cellulose with specific degree of oxidation (0.3-0.9) and controlling oxidation conditions to enable dissolution in milder conditions. This transforms the cellulose structure to achieve solubility without requiring cumbersome traditional processes
Solution Approach 2:
The patent uses a composite solvent system comprising N,N-dimethylacetamide and lithium halide, combining two substances to achieve effective cellulose dissolution. This composite approach allows dissolution under milder conditions compared to single solvent systems
2Reliability
If traditional cellulose dissolution processes are used, then cellulose can be dissolved, but the cost increases
Solution Approach 1:
The patent modifies the dissolution parameters by using oxidized cellulose and a specific solvent composition, enabling effective dissolution at lower costs by avoiding expensive traditional reagents and processes
Solution Approach 2:
The patent employs relatively inexpensive chemicals (N,N-dimethylacetamide and lithium halide) that can be easily handled and disposed of, reducing manufacturing costs compared to expensive specialized reagents required by traditional methods
3Reliability
If traditional cellulose dissolution processes are used, then cellulose can be dissolved, but harsh conditions cause degradation
Solution Approach 1:
The patent changes the dissolution conditions to milder temperatures and pH ranges by using oxidized cellulose and a specific solvent system, effectively preventing thermal and chemical degradation that occurs in traditional harsh dissolution processes
Solution Approach 2:
The patent converts the potential harm of oxidation into a benefit by pre-oxidizing the cellulose to a controlled degree, which actually facilitates milder dissolution conditions and reduces subsequent degradation. The oxidation that could be harmful becomes the key to gentler processing
4Reliability
If traditional cellulose dissolution processes are used, then cellulose can be dissolved, but solubility in common solvents is limited
Solution Approach 1:
The patent creates a composite solvent system combining N,N-dimethylacetamide and lithium halide, which together provide enhanced solubility for oxidized cellulose. This composite approach overcomes the limitations of individual common solvents
Solution Approach 2:
The patent modifies the cellulose structure through controlled oxidation, changing its chemical parameters to improve compatibility with the solvent system. This structural modification enables better solubility in the chosen solvent while maintaining versatility for different applications
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 process effectively dissolves cellulose with minimal degradation, maintaining a high degree of oxidation and molecular weight, allowing for the formation of stable modified cellulose solutions suitable for various applications.
Implementation Method 1
contacting a modified cellulose with a solvent under an inert atmosphere to form a swelled modified cellulose
Implementation Method 2
contacting the swelled modified cellulose with a salt under the inert atmosphere to form a modified cellulose solution
Data Source
AI summary
A process for dissolving modified cellulose is disclosed. The process includes contacting modified cellulose with a solvent in a mixture to form swelled modified cellulose and then contacting the mixture with a salt to dissolve the swelled modified cellulose.