Continuous Solution Polymerization with Staged Separation for Fouling Control
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Solution Overview
Problem
The physical entrainment of oligomers, low-density materials, and products in the devolatilizer of a polymer continuous solution polymerization process leads to fouling, destabilizing the recirculation process and reducing product productivity.
Innovation Solution
A continuous solution polymerization process incorporating a recirculation system that includes a liquid-liquid separator and a solid-liquid separator to separate polymer-rich and polymer-lean solutions, ensuring the polymer content ratio (Ma > Mb) is maintained, thereby preventing fouling and improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a devolatilizer is used to remove volatile components from the polymerization reactor effluent, then the polymerization process can continue, but oligomers, low-density materials, and products are physically entrained causing fouling in the recirculation system
Solution Approach 1:
The patent divides the separation process into multiple stages using different types of separators. A first separator removes bulk volatile components, while a second separator specifically targets and removes physically entrained oligomers and low-density materials. This segmentation prevents fouling by addressing different contamination sources at different stages, allowing continuous operation without accumulation of harmful materials in the recirculation system.
Solution Approach 2:
The patent extracts and removes specific harmful components (oligomers, low-density materials) from the polymerization effluent stream using specialized separation equipment. By selectively extracting these problematic substances before recirculation, the system prevents them from causing fouling in pumps, heat exchangers, and other recirculation components, thereby maintaining productivity over time.
2Use of energy by moving object
If the recirculation system operates continuously to maintain polymerization, then energy efficiency increases, but fouling from physically entrained materials destabilizes the recirculation process
Solution Approach 1:
The patent implements preliminary separation actions before the material enters the recirculation system. By using separators to remove volatile components, oligomers, and low-density materials upstream in the process flow, the system prepares the stream to be free of fouling agents before recirculation begins. This preliminary action allows continuous recirculation to proceed stably without sudden destabilization from accumulated contaminants.
3Loss of substance
If physically entrained oligomers and low-density materials are recirculated back to the reactor, then material utilization increases, but fouling occurs in the recirculation system components
Solution Approach 1:
The patent extracts and removes physically entrained oligomers and low-density materials from the effluent stream using separation equipment. These extracted components are disposed of or processed separately, preventing them from being recirculated back to the reactor where they would cause fouling in pumps, heat exchangers, and other components. This selective removal maintains material utilization for desirable products while eliminating harmful entrained materials.
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 enhances energy efficiency and extends the operational longevity of the polymerization process, increasing productivity by reducing fouling and optimizing the recirculation system.
Implementation Method 1
separating the supplied product into a first solution comprising the polymer and a second solution comprising the polymer in the liquid-liquid separator
Implementation Method 2
separating the first solution into a vapor comprising the polymer and a liquid-state polymer in the devolatilizer
Implementation Method 3
separating the supplied second solution and the vapor comprising the polymer into a solvent capable of being introduced into the reactor and a solid comprising the polymer in the solid-liquid separator
Data Source
AI summary
A continuous solution polymerization process may include producing a product including a polymer through a polymerization process in a reactor; separating the product into a first solution including the polymer and a second solution including the polymer in the liquid-liquid separator; supplying the first solution to a devolatilizer and supplying the second solution to a solid-liquid separator (S/L separator); separating the second solution into a vapor including the polymer and a liquid-state polymer in the devolatilizer; separating the second solution and the vapor including the polymer into a solvent capable of being introduced into the reactor and a solid including the polymer in the solid-liquid separator (S/L separator); and introducing and recirculating the solvent capable of being introduced into the reactor into the reactor.