Cationic Hydroxypropyl Cellulose Production via Controlled Water Content
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Solution Overview
Problem
Existing methods for producing cationic hydroxypropyl cellulose lack efficiency in achieving high water solubility and productivity, as they often require excessive solvents and have low reaction efficiency.
Innovation Solution
A process involving the reaction of low-crystalline powdery cellulose with a cationizing agent and propylene oxide in the presence of controlled water content, between 10% to 60% by mass, using a catalyst to produce cationic hydroxypropyl cellulose with enhanced water solubility and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hydroxyalkyl cellulose slurry is cationized with a cationizing agent, then cationic hydroxyalkyl cellulose can be produced, but the productivity and reaction efficiency are low
Solution Approach 1:
The invention changes the physical state parameter of cellulose from slurry to powder form, and controls the water content parameter in the reaction system to 10-60% by mass. This parameter change transforms the reaction system to achieve both high productivity and high reaction efficiency simultaneously, resolving the contradiction between these two parameters.
2Productivity
If excessive solvents are used in the reaction system, then the reaction can proceed, but the productivity decreases
Solution Approach 1:
The invention optimizes the water content parameter to a specific range of 10-60% by mass, eliminating the need for excessive solvents. This parameter optimization allows the reaction to proceed efficiently with reduced solvent quantity, thereby improving productivity while maintaining reaction effectiveness.
3Reliability
If the water content in the reaction system is not controlled, then the reaction can occur, but the water solubility of the product is reduced
Solution Approach 1:
The invention establishes a specific water content range of 10-60% by mass as the optimal parameter for achieving high water solubility. By controlling this parameter, the invention ensures reliable production of cationic hydroxypropyl cellulose with excellent water solubility, making the control mechanism worthwhile despite the added complexity.
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 process achieves high water solubility and productivity in cationic hydroxypropyl cellulose, making it suitable for applications in cleaning agents and other chemical compositions.
Implementation Method 1
reacting a low-crystalline powdery cellulose with a cationizing agent represented by the following general formula (1) and/or a cationizing agent represented by the following general formula (2), and propylene oxide in the presence of water in an amount of from 10 to 60% by mass on the basis of the low-crystalline powdery cellulose, and a catalyst
Data Source
AI summary
The present invention relates to a process for producing a cationic hydroxypropyl cellulose including the step of reacting a low-crystalline powdery cellulose with a cationizing agent represented by the following general formula (1) and/or a cationizing agent represented by the following general formula (2), and propylene oxide in the presence of water in an amount of from 10 to 60% by mass on the basis of the low-crystalline powdery cellulose, and a catalyst:wherein R1 to R3 are each independently a linear or branched hydrocarbon group having 1 to 4 carbon atoms; and X and Z are each a halogen atom and may be the same or different from each other.