Polymer Devolatilization via Phase Transition
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Solution Overview
Problem
Current continuous solution polymerization processes face challenges in achieving efficient devolatilization and pelletization, particularly for heat-sensitive polymers, due to high operating costs, mechanical shear, and thermal degradation, which result in suboptimal polymer quality and reduced production rates.
Innovation Solution
The process involves injecting volatile organic components (VOCs) or inert gases into the polymerization mixture to control temperature and pressure, facilitating efficient devolatilization and pelletization by maintaining a stable polymer melt temperature and reducing volatile components, thereby enhancing polymer purity and process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If polymer solution is heated above vaporization temperature for evaporation, then volatile components are removed, but mechanical shear causes deterioration of physical properties
Solution Approach 1:
The patent utilizes phase transition of water (freezing and vaporization) to remove volatile components. The polymer solution is frozen to separate ice from the solution, then the frozen polymer is vaporized to remove volatiles without mechanical shear, resolving the contradiction between volatile removal and property preservation
Solution Approach 2:
The patent replaces mechanical evaporation systems (which cause shear) with a thermal phase transition system. By freezing the polymer solution and then vaporizing the frozen polymer, volatiles are removed through phase change rather than mechanical heating, preserving physical properties while achieving volatile removal
2Loss of substance
If polymer solution is subjected to high temperatures for prolonged periods, then devolatilization is achieved, but thermal degradation occurs causing discoloration and loss of engineering properties
Solution Approach 1:
The patent employs phase transitions (freezing followed by vaporization) to achieve devolatilization without prolonged high-temperature exposure. The frozen polymer structure protects against thermal degradation while enabling volatile removal through controlled vaporization, resolving the contradiction between devolatilization efficiency and thermal degradation prevention
Solution Approach 2:
The patent applies preliminary freezing action before vaporization. By freezing the polymer solution first, the structure is stabilized and protected from thermal degradation during subsequent vaporization, while still allowing effective volatile removal. This preliminary action prevents the harmful thermal effects
3Object-affected harmful factors
If mild temperatures and long residence time are used to avoid degradation, then polymer quality is maintained, but output suffers due to low flow rate
Solution Approach 1:
The patent uses phase transitions to dramatically reduce residence time requirements. Freezing the polymer solution and then vaporizing the frozen polymer enables rapid volatile removal at mild temperatures, achieving both high productivity and polymer quality protection simultaneously by bypassing the need for long residence times
Solution Approach 2:
The patent rushes through the devolatilization process by using vaporization of frozen polymer. This method quickly removes volatiles in a single step without requiring prolonged mild heating, thereby maintaining high output while preventing degradation through minimized thermal exposure time
4Productivity
If large devices and great mechanical energy expenditure are used for evaporation, then high output is achieved, but initial cost and operating cost increase
Solution Approach 1:
The patent replaces mechanical energy-intensive evaporation systems with a thermal phase transition system. By freezing the polymer solution and then vaporizing the frozen polymer, the process achieves high output without requiring large mechanical energy inputs or complex equipment, resolving the contradiction between productivity and energy consumption
Solution Approach 2:
The patent utilizes phase transitions (freezing and vaporization) to achieve efficient volatile removal with minimal energy input. The phase change mechanism naturally separates volatiles from polymer without requiring large mechanical energy expenditure or oversized equipment, maintaining high productivity while reducing energy costs
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 allows for the production of high-grade polymers with improved pelletization performance and reduced operating costs, while minimizing thermal degradation and mechanical stress, across a broad range of polymer types and molecular weights.
Implementation Method 1
injecting volatile organic components (VOCs) or inert gases into the polymerization mixture to control temperature and pressure
Implementation Method 2
injecting volatile organic components (VOCs) or inert gases into the polymerization mixture to control temperature and pressure
Implementation Method 3
The heat of the polymerization reaction, called an exotherm, can be absorbed by the reaction mixture
Implementation Method 4
the heat of reaction can be removed by a cooling system, such as by external cooling of the walls of the reactor vessel, or by internally arranged heat exchange surfaces cooled by a heat exchange fluid
Implementation Method 5
One method for isolating polymers from volatile components is by evaporation where the polymer solution is heated above the vaporization temperature of the volatile components
Implementation Method 6
heated above the vaporization temperature of the volatile components
Data Source
AI summary
In at least one embodiment, a process of forming a polymer includes supplying a feed having one or more olefin monomers and a solvent; contacting the feed with a catalyst to form a reaction mixture; treating the reaction mixture in a first separator to form a first polymer-rich mixture; introducing the first polymer-rich mixture into a second separator; introducing a volatile component and/or inert component into the first separator, the second separator and/or a line between the first separator and the second separator; treating the first polymer-rich mixture to form a second polymer-rich mixture; and devolatilizing the second polymer-rich mixture to obtain the polymer.