Polymer Dilution Apparatus with Segmented Shear Zones
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Solution Overview
Problem
Current methods for diluting and activating polymeric materials, such as polyelectrolytes, face challenges in efficiently untangling and hydrating high-molecular weight polymers due to the formation of 'fisheyes' and the fragility of polymer molecules during mixing, leading to prolonged activation times and potential damage.
Innovation Solution
A chemical treatment apparatus with a mixing chamber featuring a high shear mixing zone followed by a low shear mixing zone, utilizing a mechanical mixing device with an impeller in the high shear zone and a static mixer, and a post-dilution zone to achieve efficient dilution and activation of polymeric materials without excessive damage, with a volume ratio of high to low shear zones ranging from 1:2 to 1:10.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high shear agitation is used to mix polymeric material with water, then mixing speed and activation efficiency are improved, but polymer molecules are damaged due to excessive energy input
Solution Approach 1:
The mixing process is segmented into distinct zones: a high shear mixing zone for rapid initial activation and a low shear mixing zone for gentle completion of hydration. This segmentation allows each zone to perform its specific function optimally without compromising polymer integrity
Solution Approach 2:
Different shear conditions are applied to different spatial locations within the mixing chamber. The high shear mixing zone receives intense agitation for rapid activation, while the low shear mixing zone provides gentle mixing for final hydration, ensuring local optimization of both activation speed and polymer protection
2Strength
If low shear agitation is used to protect polymer molecules, then polymer integrity is maintained, but activation time increases significantly
Solution Approach 1:
The mixing chamber is divided into high shear and low shear zones, allowing the process to benefit from both high shear (fast activation) and low shear (polymer protection) simultaneously, eliminating the need to choose one over the other
Solution Approach 2:
The high shear mixing zone performs preliminary activation of the polymer before the mixture enters the low shear mixing zone. This preliminary action achieves rapid initial hydration, reducing the time required in the gentle mixing zone and overall activation time
3Speed
If polymeric material contacts water directly, then hydration begins immediately, but fisheyes form on the surface preventing further water penetration
Solution Approach 1:
The apparatus creates localized high shear conditions at the point of water-polymer contact to prevent fisheye formation, while maintaining overall gentle mixing conditions. This local application of high shear energy eliminates the harmful surface effect without subjecting the entire polymer mass to damaging forces
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 apparatus effectively dilutes and activates polymeric materials quickly and efficiently, achieving higher viscosities and maintaining polymer integrity by controlling shear rates and mixing zones, thereby optimizing the activation process.
Implementation Method 1
high shear agitation is used to mix the polymeric material with water... high shear mixing zone
Implementation Method 2
low shear agitation is sometimes used in lieu of or in addition to high shear agitation... low shear mixing zone
Data Source
AI summary
A chemical treatment apparatus for diluting and activating a polymeric material can include a mixing chamber having a first end, a second end, a first baffle plate positioned between the first end and second end, a high shear mixing zone positioned between the first end of the mixing chamber and the first baffle plate, and a low shear mixing zone positioned downstream from the high shear agitation zone between the second end of the mixing chamber and the first baffle plate. The volume ratio of the high shear mixing zone to the low shear mixing zone can be in the range of 1:2 to 1:10. A method and system for diluting and activating polymeric materials are also disclosed.