Superabsorbent Polymer Gel Flowability via Carbonate Neutralization
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Solution Overview
Problem
Existing processes for producing superabsorbent polymers do not adequately improve the flowability of polymer gels, which is crucial for efficient processing and product quality.
Innovation Solution
A process involving the use of a basic aqueous medium comprising carbonate and/or hydrogen carbonate is introduced during the working-up step of superabsorbent polymer gel production, including recycling scrubber water as a source of carbonate, which enhances the flowability without compromising process stability or product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional drying and grinding processes are used for superabsorbent polymer gel, then the polymer can be processed into final product form, but the flowability of the polymer gel deteriorates causing handling difficulties and formation of conglomeration masses
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the polymer gel through controlled post-neutralization. By adjusting the degree of neutralization and adding specific additives during the polymerization process, the gel's flowability parameters are optimized to prevent conglomeration while maintaining ease of handling in subsequent processing steps.
Solution Approach 2:
The patent introduces intermediary substances (additives and basic aqueous mediums) that act as mediators between the polymer gel and the processing environment. These intermediaries modify the gel's surface properties and internal structure to improve flowability without compromising the final product quality, resolving the contradiction between ease of operation and manufacturing ease.
2Ease of operation
If water is added to polymer gel to improve flowability, then handling is facilitated, but the drying process becomes more energy-intensive and product quality may deteriorate
Solution Approach 1:
The patent optimizes the water content parameter within specific ranges (0.1-30 parts by weight per 100 parts polymer) to achieve adequate flowability while minimizing excess water that would require energy-intensive removal. This parameter optimization resolves the contradiction between improving operability and reducing energy consumption in the drying stage.
Solution Approach 2:
The patent applies partial action by adding only the minimum necessary amount of water or basic aqueous medium required to improve gel flowability, rather than excessive water. This controlled partial addition achieves the flowability improvement goal while avoiding the penalty of high energy consumption during drying, effectively resolving the technical contradiction.
3Ease of operation
If basic aqueous medium is added during polymerization to improve gel flowability, then handling is improved, but process complexity increases
Solution Approach 1:
The patent merges the flowability improvement function with the existing polymerization process by incorporating basic aqueous medium addition directly into the polymerization step. This integration allows the gel to develop improved flow properties during formation itself, rather than requiring separate post-processing steps, thereby improving ease of operation without proportionally increasing process complexity.
Solution Approach 2:
The basic aqueous medium serves multiple functions simultaneously: it acts as a neutralizing agent, a flowability enhancer, and a process simplifier. This multi-functionality resolves the contradiction by achieving flowability improvement through a single integrated process step rather than requiring additional separate operations, thus avoiding excessive complexity increase.
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 effective recycling of all process streams, improving the flowability of the polymer gel and maintaining product quality, thereby enhancing the overall efficiency of the superabsorbent polymer production process.
Implementation Method 1
a basic aqueous medium comprising carbonate and/or hydrogen carbonate is fed to the superabsorbent polymer gel
Implementation Method 2
subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel
Data Source
AI summary
The present invention relates to a process for the production of a superabsorbent polymer comprising: (a) preparing an aqueous mixture of monomers selected to provide after polymerization a superabsorbent polymer, (b) feeding said monomer mixture to a reactor, (c) subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel, and (d) removing the superabsorbent polymer from the reactor, (e) working-up the superabsorbent polymer removed from the reactor to obtain a final product, whereby a basic aqueous medium comprising carbonate and/or hydrogen carbonate is fed to the superabsorbent polymer gel.