Esterified Cellulose Pulp via Ionic Liquid Homogeneous Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of high-quality cellulose esters from wood pulp is hindered by low yield and high costs due to the need for extensive processing to remove hemicellulose and lignin, making it economically challenging to produce these esters from low-quality pulp sources.
Innovation Solution
The method involves combining cellulose pulp with an ionic liquid and an esterification agent, optionally with a catalyst, to produce esterified cellulose pulp compositions with a degree of substitution from 0.1 to 3.0 and a hemicellulose content of 2.5 to 20% by weight, using a homogeneous process that preserves hemicellulose content and reduces lignin, thereby increasing yield and reducing processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extensive processing is used to remove hemicellulose and lignin to produce high quality pulp, then product quality is improved, but yield is reduced and costs increase
Solution Approach 1:
The patent changes the chemical parameters of the esterification process by using specific catalysts and controlling reaction conditions to enable effective esterification of cellulose while preserving hemicellulose. This allows the use of lower quality pulp (with hemicellulose content up to 30%) without compromising the quality of the final cellulose ester product, thereby resolving the contradiction between pulp quality requirements and yield.
2Manufacturing precision
If extensive processing is used to remove hemicellulose and lignin to produce high quality pulp, then product quality is improved, but processing costs increase
Solution Approach 1:
The patent modifies the esterification process parameters by using alternative catalysts and reaction conditions that are effective with lower quality pulp. This eliminates the need for expensive chemical pulping and bleaching processes, significantly reducing processing costs while maintaining product quality through controlled esterification that preserves desirable hemicellulose components.
3Manufacturing precision
If heterogeneous processes are used to reduce hemicellulose content, then product quality is improved, but additional processing steps are required
Solution Approach 1:
The patent changes the approach from heterogeneous to homogeneous esterification by dissolving cellulose in ionic liquids before esterification. This single-step process simultaneously achieves esterification of cellulose while preserving hemicellulose, eliminating the need for separate processing steps to remove hemicellulose that are required in traditional heterogeneous processes.
4Manufacturing precision
If high quality pulp is used for cellulose ester production, then desired product properties are achieved, but material costs increase
Solution Approach 1:
The patent changes the chemical environment of the esterification process by using ionic liquids as solvents and alternative catalysts, which enables the use of lower quality, more abundant wood pulp sources. The modified reaction conditions ensure that cellulose is effectively esterified while hemicellulose is preserved, producing cellulose esters with desirable properties from cheaper raw materials.
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 approach allows for the production of high-quality esterified cellulose pulp compositions in high yield from commercially available wood pulp, reducing processing complexity and costs while maintaining desired properties, such as low sulfur and nitrogen content, and offering flexibility in forms like particles, pellets, or fibers.
Implementation Method 1
combining a cellulose pulp with an ionic liquid
Implementation Method 2
adding an esterification agent and/or a catalyst to the solution, then isolating esterified cellulose from the reaction mixture
Data Source
AI summary
Esterified cellulose pulp compositions produced in high yield from commercially available wood pulp sources, methods for making the esterified cellulose pulp compositions, and articles prepared from the esterified cellulose pulp compositions.