Hybrid Batch Reactor Polymerization for Acrylic Monomers
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Solution Overview
Problem
Current methods for producing low molecular weight polymers are costly and inefficient, often requiring expensive chain transfer agents that introduce undesirable properties and by-products, and high initiator levels can lead to polymer degradation and salt formation, posing challenges in achieving safe and environmentally friendly polymerization processes, especially for acrylic monomers.
Innovation Solution
A process involving hybrid reactors maintained at sub-reflux conditions and batch reactors at reflux conditions to polymerize monomers, utilizing a combination of hybrid and batch reactors to control temperature and pressure, reducing the need for excessive initiators and minimizing by-product formation, while allowing for safer and more efficient polymerization of acrylic monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chain transfer agents are used to produce low molecular weight polymers, then molecular weight is reduced, but cost increases and undesirable properties are introduced
Solution Approach 1:
The patent changes the polymerization parameters by using high temperature (250-500°C) and high pressure (1000-5000 psi) conditions to achieve low molecular weight polymers without requiring chain transfer agents. This fundamental parameter change eliminates the need for expensive and problematic chain transfer agents while still achieving the desired molecular weight control through physical conditions rather than chemical additives.
2Manufacturing precision
If high initiator levels are used to lower molecular weight, then molecular weight decreases, but polymer degradation and salt formation increase
Solution Approach 1:
The patent employs extreme temperature and pressure parameters to initiate and control polymerization without requiring excessive initiator levels. The high temperature (250-500°C) and high pressure (1000-5000 psi) conditions provide sufficient energy for polymerization to proceed efficiently with minimal initiator, thereby avoiding polymer degradation and salt formation that occur with high initiator concentrations at conventional temperatures.
3Ease of manufacture
If hydrogen peroxide is used as initiator at conventional temperatures, then cost decreases and toxicity reduces, but polymerization efficiency decreases
Solution Approach 1:
The patent overcomes the limited efficiency of hydrogen peroxide at conventional temperatures by fundamentally changing the temperature parameter to extreme high temperature (250-500°C) and high pressure (1000-5000 psi) conditions. Under these modified parameters, hydrogen peroxide can effectively decompose and generate radicals efficiently, achieving both the desired cost and toxicity benefits and adequate polymerization efficiency simultaneously.
4Productivity
If ultra high pressure and temperature are used for rapid polymerization, then production time decreases, but safety concerns increase
Solution Approach 1:
The patent segments the polymerization process into two distinct stages: a hybrid reactor stage for initial polymerization at controlled conditions, and a batch reactor stage for completion. This segmentation allows the system to achieve rapid polymerization in the first stage while maintaining safety through controlled conditions, then completing the process in the second stage under managed parameters, thereby balancing productivity with safety.
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 enables the production of polymers with desired molecular weights while reducing costs and minimizing undesirable properties, achieving safer and more efficient polymerization processes, particularly for acrylic monomers, by effectively controlling polymerization conditions across hybrid and batch reactors.
Implementation Method 1
conveying hybrid reactor mixtures comprising one or more hybrid reactor monomers and one or more hybrid reactor initiators to one or more hybrid reactors maintained at effective hybrid polymerization temperatures and sub-reflux polymerization gage pressures to cause polymerization of a portion of said hybrid reactor monomers into said polymer
Implementation Method 2
conveying hybrid reactor contents to one or more batch reactors maintained at effective batch polymerization temperatures and reflux polymerization pressures
Data Source
AI summary
The present invention is directed to a novel high temperature polymerization process operating at high pressures for producing a polymer. The process includes conveying hybrid reactor mixtures, which include one or more hybrid reactor monomers and one or more hybrid reactor initiators to one or more hybrid reactors. The hybrid reactors are maintained at effective hybrid polymerization temperatures and sub-reflux polymerization gage pressures to cause polymerization of a portion of the hybrid reactor monomers into the polymer. The process further includes conveying hybrid reactor contents from the hybrid reactors to one or more batch reactors maintained at effective batch polymerization temperatures and reflux polymerization pressures to cause polymerization of a remaining portion of the hybrid reactor monomers into the polymer. The hybrid reactors are smaller in volume than the batch reactors. By utilizing the hybrid/batch reactor combination, the process of the present invention can be operated under safe working conditions. The process of the present invention also allows control of the polydispersity and molecular weight of the resulting polymers. As a result, the polymers made therefrom can be used as binders in compositions, such as coating compositions used in the automotive refinish and OEM applications having desired coating properties. The present invention is also directed to a polymerization system used in the process of the present invention.