Polymer Finishing Process Temperature Control
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Solution Overview
Problem
Continuous solution polymerization processes face challenges in producing polymers with minimal volatile components, achieving high molecular weights, and optimizing pelletization rates, particularly at varying temperatures and pressures, while also dealing with catalyst solubility issues and environmental concerns.
Innovation Solution
A process involving the formation of polymer-rich phases with controlled temperature adjustments and multiple separation stages, including a reactor, separators, and a devolatilizer, to remove volatile components and optimize polymer concentration and pelletization, using a catalyst system that allows for efficient polymerization across a broad range of conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the concentration of polymer in the reaction mixture is increased, then the viscosity of the mixture increases, but this makes the mixture harder to process and control
Solution Approach 1:
The patent divides the finishing section into multiple separate units (first finishing unit, second finishing unit, etc.) where each unit performs a specific function. The reaction mixture is processed through these segmented units sequentially, allowing controlled removal of solvent and monomer at different stages, which manages viscosity changes better than a single processing unit.
Solution Approach 2:
The patent employs adjustable parameters including variable temperatures, pressures, and flow rates in the finishing section. The system can dynamically adjust these parameters to optimize processing conditions at different stages of solvent removal, allowing the mixture to be handled more easily despite increasing polymer concentration.
2Productivity
If the temperature is increased to improve pelletization rate, then the molecular weight distribution may broaden, but this affects polymer quality
Solution Approach 1:
The patent separates the finishing process into multiple units with different temperature conditions. The first finishing unit operates at a first temperature and the second finishing unit operates at a second temperature, allowing each stage to be optimized independently for either productivity or molecular weight control.
Solution Approach 2:
The patent changes temperature parameters between different finishing units and during different stages of the process. By adjusting temperature dynamically across the finishing section, the system can enhance pelletization rate in certain stages while maintaining molecular weight distribution control in others.
3Manufacturing precision
If multiple separation stages are implemented to remove volatile components, then the polymer purity increases, but the equipment complexity increases
Solution Approach 1:
The patent divides the separation process into multiple finishing units, each performing a specific separation function. This segmentation allows systematic removal of different volatile components at different stages while maintaining a relatively simple design for each individual unit.
Solution Approach 2:
The finishing units are designed to perform multiple functions including solvent removal, monomer removal, and polymer concentration in a single integrated unit, reducing the need for completely separate equipment for each function and thereby limiting the increase in overall equipment complexity.
4Productivity
If high temperatures are used for polymerization, then the reaction rate increases, but phase separation may occur in the reaction mixture
Solution Approach 1:
The patent employs a catalyst system with specific properties that stabilizes the reaction mixture at high temperatures. The catalyst composition is designed to prevent phase separation before it can occur during the polymerization process, allowing high reaction rates to be maintained without loss of phase homogeneity.
Solution Approach 2:
The patent optimizes multiple parameters including temperature, pressure, catalyst concentration, and monomer-to-catalyst ratio to maintain phase homogeneity at high temperatures. By coordinating changes in these parameters, the system achieves high reaction rates while preventing phase separation.
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 process effectively reduces volatile components, achieves a broad spectrum of molecular weights and comonomer contents, and enhances pelletization rates, while minimizing equipment requirements and operating costs, and allows for polymer production at high temperatures.
Implementation Method 1
contacting the feed with a catalyst to form a reaction mixture... polymerizing monomers to form a reaction mixture
Implementation Method 2
devolatilizing the second polymer-rich phase to obtain the polymer... removing volatile component(s) from the second polymer-rich phase
Implementation Method 3
a vacuum devolatilizer in which the molten polymer is exposed to a vacuum
Implementation Method 4
treating the reaction mixture to form a first polymer-rich phase... treating the first polymer-rich phase to form a second polymer-rich phase... phase separation being encouraged by higher temperatures and/or by lower pressures
Data Source
AI summary
The present invention relates to a process of forming a polymer, the process comprising polymerizing olefin monomers to form a reaction mixture, treating the reaction mixture to form a first polymer-rich phase, treating the first polymer-rich phase to form a second polymer-rich phase, and devolatilizing the second polymer-rich phase, the process further comprising at least one step of adjusting the temperature of a first and/or the second polymer-rich phase before the devolatilization. The present invention also relates to a plant that is useful for the process provided above.