Polyolefin Dissolution Apparatus Stirrer Dynamics
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Solution Overview
Problem
Current solvent-based recycling processes for polyolefins face challenges in achieving fast dissolution times and homogeneity of polyolefin solutions, which are crucial for producing high-quality recycled materials, especially for applications like food contact and high-performance products, due to high viscosities and contamination issues.
Innovation Solution
A dissolution apparatus and process that utilize a feeding device and a dissolution device with a stirrer, allowing for the continuous recycling of polyolefins by feeding waste polyolefin material and solvent, achieving a polyolefin solution slurry with undissolved residues, and optionally including a homogenizing step to ensure efficient mixing and heat control, thereby optimizing dissolution times and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional dissolution processes are used for polyolefin recycling, then the process can handle high viscosity materials, but the dissolution time is long and homogeneity is poor
Solution Approach 1:
The patent applies dynamic mixing elements including a rotating rotor with mixing elements and a stationary stator with corresponding mixing elements that create dynamic shear forces and turbulent flow patterns. This dynamic interaction between moving and stationary mixing components significantly accelerates dissolution while ensuring homogeneous distribution of polyolefin in the solvent, resolving the contradiction between dissolution time and solution homogeneity.
Solution Approach 2:
The mixing apparatus utilizes mechanical vibration and intense shear forces generated by the rotor-stator configuration to rapidly break down polymer aggregates and enhance mass transfer. The high-shear mixing action creates micro-turbulence that accelerates dissolution kinetics and ensures uniform dispersion, thereby reducing dissolution time while improving homogeneity.
2Productivity
If intensive mixing is applied to achieve homogeneity, then dissolution speed increases, but energy consumption and operational costs increase
Solution Approach 1:
The mixing process is segmented into multiple stages with varying intensity levels. The rotor-stator system provides high-intensity mixing only in the critical dissolution zone, while other regions use lower-intensity flow patterns. This segmented approach maintains high dissolution speed in the reaction zone while reducing overall energy consumption compared to uniform intensive mixing throughout the entire vessel.
Solution Approach 2:
The continuous flow design ensures that polyolefin material continuously passes through the high-shear mixing zone, maintaining constant dissolution action without idle periods. This continuous processing eliminates the need for repeated batch mixing cycles, sustaining high productivity while optimizing energy use by avoiding redundant mixing operations.
3Manufacturing precision
If advanced sorting and washing operations are implemented to improve polymer quality, then product quality increases, but process complexity and capital expenditure increase
Solution Approach 1:
The patent replaces complex mechanical sorting and washing systems with a chemical dissolution approach. By dissolving polyolefin in selective solvents, the process inherently separates target polymers from contaminants based on solubility differences, eliminating the need for multiple mechanical sorting stages, washing operations, and associated infrastructure, thereby simplifying the overall process while maintaining high product quality.
Solution Approach 2:
The process utilizes changes in solvent properties (temperature, composition) to control dissolution and precipitation behavior. By adjusting these parameters, the system achieves selective dissolution of desired polymers while leaving contaminants undissolved, enabling quality separation through parameter optimization rather than complex mechanical means.
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 solution enables faster and more homogeneous dissolution of polyolefins, reducing operational and capital expenditures by improving mixing patterns and heat control, leading to higher quality recycled polyolefin materials suitable for various applications.
Implementation Method 1
the dissolution device comprises a vessel comprising a stirrer
Data Source
AI summary
A dissolution apparatus for dissolving from a waste polyolefin material a polyolefin in a solvent yielding a polyolefin solution slurry), the polyolefin solution slurry comprising a polyolefin solution and undissolved residues, for a continuous polyolefin recycling process, the dissolution apparatus comprising at least one feeding device selected from a list consisting of a dry feeding device, a wet feeding device, a melt feeding device, and a solution feeding device, at least one dissolution device, wherein the at least one dissolution device has at least one first inlet for introducing the waste polyolefin material fluidly connected to an outlet of the at least one feeding device, and wherein the at least one dissolution device has at least one second inlet for introducing the solvent, and wherein the at least one dissolution device has at least one outlet for withdrawing the polyolefin solution slurry, and wherein the dissolution device comprises a vessel comprising a stirrer.