Esterified Cellulose Pulp via Ionic Liquid Homogeneous Esterification
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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 the quality of cellulose ester products is improved, but the pulp yield decreases and processing costs increase
Solution Approach 1:
The patent changes the chemical parameters of the esterification process by using specific catalysts and controlling reaction conditions to achieve selective esterification of cellulose over hemicellulose, allowing high quality product formation without extensive preprocessing
Solution Approach 2:
The patent performs esterification directly on the as-pulped wood pulp without preliminary removal of hemicellulose and lignin, thereby preserving yield while still producing high quality cellulose ester products through selective chemical modification
2Manufacturing precision
If extensive processing is used to remove hemicellulose and lignin to produce high quality pulp, then the quality of cellulose ester products is improved, but the processing costs increase
Solution Approach 1:
The patent eliminates the need for extensive preprocessing steps by performing esterification directly on as-pulped wood pulp, thereby reducing capital and operating costs while maintaining product quality through selective chemical modification
Solution Approach 2:
The patent uses specific catalysts and reaction condition optimizations to achieve selective esterification of cellulose in the presence of hemicellulose and lignin, avoiding the need for expensive preprocessing while ensuring high quality product formation
3Manufacturing precision
If heterogeneous processes are used to treat wood pulp with esterifying solution, then the hemicellulose content is reduced and product quality is enhanced, but the yield decreases and additional processing steps are required
Solution Approach 1:
The patent uses homogeneous esterification conditions with specific catalysts to achieve selective esterification of cellulose, simplifying the process by eliminating the need for separation steps required in heterogeneous processes while maintaining product quality
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 desirable properties such as low sulfur and nitrogen content, making the process more economically viable.
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.