Porous Polymer Beads with Solid Particulate Fillers for Water Purification
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Solution Overview
Problem
Current polymer bead technologies for water purification, such as those with ion exchange capacity, face limitations in efficiency and separation challenges when used in packed columns or stirred tank processes, particularly in removing dissolved organic carbon (DOC) from water.
Innovation Solution
The development of polymer beads with a porous polymeric matrix distributed with solid particulate material, using a dispersion process involving a non-polymeric porogen and specific crosslinking monomers, enhances contaminant removal and mechanical properties, allowing for improved DOC removal and easier separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymer beads are packed into a column for water purification, then the structure is simple and easy to operate, but the contaminant removal efficiency is limited
Solution Approach 1:
The patent employs porous polymer beads with controlled pore structures to dramatically increase the surface area available for contaminant adsorption. The porous matrix allows contaminants to penetrate deeper into the bead structure, enhancing removal efficiency without requiring a more complex system configuration.
Solution Approach 2:
The patent creates composite polymer beads by incorporating solid particulate materials (such as metal oxides or magnetic particles) within the porous polymer matrix. This composite structure combines the adsorption capabilities of the polymer with the functional properties of the particulate material, significantly improving contaminant removal efficiency while maintaining the simple column operation mode.
2Productivity
If polymer beads are stirred with contaminated water in a tank, then maximum contact is achieved, but separation of small polymer beads from water becomes problematic
Solution Approach 1:
The porous structure of the polymer beads increases their effective surface area for contaminant contact during stirring, enhancing removal efficiency. The controlled pore sizes also help prevent bead fragmentation, maintaining bead integrity for easier separation.
Solution Approach 2:
By incorporating solid particulate materials with different densities or magnetic properties into the polymer matrix, the composite beads achieve enhanced contaminant removal while providing separation advantages. Magnetic particles enable magnetic separation, and density differences facilitate gravitational separation, both solving the small bead separation problem.
3Productivity
If polymer beads are made with porosity to increase surface area, then contaminant removal efficiency is enhanced, but mechanical strength may be reduced
Solution Approach 1:
The patent carefully controls the porosity parameters of the polymer beads, creating an optimized pore structure that provides sufficient surface area for contaminant removal while maintaining structural integrity. The pore size distribution and connectivity are controlled to balance adsorption capacity with mechanical strength.
Solution Approach 2:
The incorporation of solid particulate materials into the porous polymer matrix acts as reinforcement, enhancing the mechanical strength of the beads. The composite structure provides structural support that compensates for the strength reduction caused by porosity, allowing the beads to maintain both high contaminant removal efficiency and adequate mechanical durability.
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 polymer beads demonstrate superior contaminant removal efficiency and mechanical properties, including increased DOC removal rates and improved wear resistance, compared to traditional methods, facilitating effective water purification.
Implementation Method 1
polymerising the polymerisable monomer composition in the presence of the non-polymeric porogen and solid particulate material to form the porous polymeric matrix of the beads
Implementation Method 2
DOC within water can adsorb onto the surface of the polymer beads
Implementation Method 3
The polymer beads may also be provided with ion exchange capacity to provide for what is commonly referred to in the art as an ion exchange resin
Data Source
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AI summary
The present invention relates to a process for producing polymer beads having a porous polymeric matrix in which is distributed solid particulate material; the process comprising: (i) providing a dispersion having a dispersed phase and a continuous phase, the dispersed phase comprising: (a) polymerisable monomer composition, (b) solid particulate material, (c) non-polymeric porogen; and (d) no polymeric porogen; wherein the polymerisable monomer composition comprises; (e) at least one mono-ethylenically unsaturated monomer, and (f) at least one crosslinking monomer having at least two ethylenically unsaturated groups that are separated by at least 4 consecutive acyclic atoms; and (ii) polymerising the polymerisable monomer composition in the presence of the non- polymeric porogen and solid particulate material to form the porous polymeric matrix of the beads.