Acrylamide-Free Polyelectrolytic Polymer Synthesis
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Solution Overview
Problem
Current polyelectrolyte polymers used in industrial applications, such as flocculation and paper production, often rely on acrylamide-based monomers, which are toxic and pose environmental and health risks due to their carcinogenic properties, and replacing them with less toxic monomers results in unsatisfactory performance.
Innovation Solution
Developing 'Acrylamide Free' polyelectrolytic polymers through a modified polymerization method using non-toxic monomers in a water-in-oil emulsion at controlled temperatures, allowing for comparable performance to acrylamide-based polymers while eliminating toxicity concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylamide-based monomers are used to prepare polyelectrolyte polymers, then the polymers achieve good flocculation and coagulation performance, but the polymers become toxic and pose environmental and health risks
Solution Approach 1:
The patent changes the chemical composition parameters by replacing acrylamide-based monomers with alternative monomers such as acrylic acid, methacrylic acid, and their derivatives. This substitution maintains the polyelectrolyte functionality and molecular weight (1-30 MD) necessary for effective flocculation while eliminating the toxic acrylamide residue, thus resolving the contradiction between performance and toxicity
Solution Approach 2:
The patent employs temporary protective measures during polymerization by using redox initiator systems that operate under mild conditions and can be completely consumed in the reaction. The redox system (combining oxidants like potassium bromate with reductants like isopropyl alcohol) initiates polymerization and is fully utilized, leaving no harmful residue, thereby enabling safe replacement of toxic monomers
2Object-affected harmful factors
If less toxic monomers are used to replace acrylamide-based monomers, then the environmental and health risks are reduced, but the polymerization performance and flocculation effectiveness become unsatisfactory
Solution Approach 1:
The patent creates composite polymer systems by combining multiple monomer types (acrylic acid, methacrylic acid, and their ester or amide derivatives) in specific ratios. This composite approach allows the resulting polymers to achieve both high molecular weight (1-30 MD) and appropriate charge density, maintaining flocculation effectiveness comparable to acrylamide-based polymers while using non-toxic monomers
Solution Approach 2:
The patent optimizes polymerization parameters including temperature (30-45°C), pH (5.0-7.5), and redox initiator concentrations to maximize the performance of non-acrylamide monomers. By carefully controlling these parameters, the resulting polymers achieve molecular weights and charge densities necessary for effective flocculation, matching or exceeding acrylamide-based polymer performance
3Productivity
If polymerization is conducted at higher temperatures to increase reaction speed, then the productivity is improved, but the molecular weight and flocculation capability of the resulting polymers decrease
Solution Approach 1:
The patent employs redox initiator systems that enable polymerization to proceed efficiently at low temperatures (30-45°C). The redox reaction between oxidants (e.g., potassium bromate) and reductants (e.g., isopropyl alcohol) generates radicals at these mild temperatures, initiating fast polymerization that produces high molecular weight polymers (1-30 MD) without the need for high temperature processing
Solution Approach 2:
The patent maintains continuous polymerization at controlled low temperatures by using redox initiators that provide sustained radical generation throughout the reaction. This continuous initiation process allows the polymer chains to grow to high molecular weights while keeping the reaction temperature low, thereby simultaneously achieving high productivity and high molecular weight polymers with excellent flocculation capability
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 new polymers demonstrate comparable or superior performance to acrylamide-based polymers in industrial applications without the environmental and health hazards, enabling their use as flocculating agents, coagulants, and thickening agents while being dosed through existing apparatuses.
Implementation Method 1
Developing 'Acrylamide Free' polyelectrolytic polymers through a modified polymerization method using non-toxic monomers in a water-in-oil emulsion at controlled temperatures
Implementation Method 2
using non-toxic monomers in a water-in-oil emulsion at controlled temperatures
Implementation Method 3
Adsorption phenomena underlie the process, whereas the pH, the temperature and the ionic force are environmental factors which strongly influence flocculation. A polymer (poly-electrolyte) can create a bridge with the particles and form an aggregate when a particle under suspension is well mixed with the flocculant agent, and the adsorption of the polymer on the surface thereof is energetically favourable
Implementation Method 4
Flocculation consists in a chemical-physical process leading to the formation of a colloidal system wherein the solid phase tends to separate by forming flocs under suspension
Data Source
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AI summary
The present invention describes the preparation of highly-performing "Acrylamide Free" polyelectrolytic polymers by using not toxic monomers and the way such new monomers can be advantageously used in the field of several civil and/or industrial applications. The new polyelectrolytic polymers developed herein can be then used both as replacement of the common acrylamide-based polymers and in the applications wherein the absence of residual toxic polymerization monomers is requested.