Torispherical Vessel Bottoms for Superabsorbent Polymer Production
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Solution Overview
Problem
Existing processes for producing superabsorbent polymer particles face challenges in efficiently managing the neutralization step, leading to undesired deposition of polymeric products and inefficiencies in the production process.
Innovation Solution
A process involving continuous mixing of acrylic acid with an aqueous base solution in a vessel with a torispherical bottom, utilizing a ring line, heat exchanger, and pump, which minimizes polymeric product deposition and enhances the discharge of undesired materials through a filter in the ring line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional neutralization apparatus is used, then the neutralization process can be performed, but polymeric products deposit on the vessel bottom reducing efficiency
Solution Approach 1:
The vessel bottom is designed with a torispherical shape consisting of a dish portion and a knuckle portion with specific radius ratios. The curved geometry prevents polymeric products from adhering to the bottom surface, allowing them to be easily flushed away by the circulating liquid flow, thereby eliminating deposition problems while maintaining continuous production efficiency
2Ease of manufacture
If the vessel has a flat bottom, then manufacturing is simpler, but polymeric products accumulate and require frequent cleaning
Solution Approach 1:
By transitioning from a flat bottom to a torispherical bottom with optimized curvature radii, the design prevents polymeric product accumulation through self-cleaning flow patterns. The curved surface geometry ensures that deposited materials are continuously washed away by the circulating neutralization liquid, eliminating the need for frequent manual cleaning operations
3Volume of moving object
If the knuckle radius is too small, then the vessel structure is more compact, but polymeric products deposit in the sharp corner
Solution Approach 1:
The knuckle portion is designed with a specific radius ratio (r2/d = 0.06 to 0.17) that balances compactness with flow dynamics. This optimized curvature prevents the formation of sharp corners where polymeric products could accumulate, while maintaining a space-efficient vessel design. The smooth transition created by the properly proportioned knuckle radius ensures continuous flow that prevents deposition
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 reduces the accumulation of polymeric products on the vessel bottom, improving the efficiency and effectiveness of the production process by maintaining the system's integrity and facilitating easy removal of undesired deposits.
Implementation Method 1
The monomer solution is cooled in a heat exchanger to a temperature of from -10 to 50° C., preferably from 5 to 30° C.
Implementation Method 2
The apparatus for preparing the partly neutralized acrylic acid comprises a ring line (R), a vessel (B), a heat exchanger (W), and a pump (P)
Data Source
AI summary
The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, wherein the monomer solution comprises partly neutralized acrylic acid formed by continuous mixing of acrylic acid and an aqueous solution of a base, the apparatus for preparing the partly neutralized acrylic acid comprises a vessel (B), and the vessel (B) has a cylindrical shape and a torispherical bottom.