Supported Antistatic Compound for Olefin Polymerization Reactor Agglomerate Control
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Solution Overview
Problem
Existing polymerization processes face issues with the formation of polymer agglomerates in reactors, which disrupt discharge and fluidization efficiency, and antistatic compounds used to prevent agglomerates often act as catalyst poisons, reducing polymer yields.
Innovation Solution
A supported antistatic compound is created by contacting an antistatic compound with a support in the absence of a transition-metal-based catalyst component, which is then introduced into the polymerization reactor to prevent agglomerate formation without inhibiting polymerization activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antistatic compounds are introduced into the polymerization reactor to prevent agglomerate formation, then polymer agglomerate formation is reduced, but polymerization activity is inhibited due to catalyst poisoning
Solution Approach 1:
The patent applies local quality by differentiating the functional properties of the supported antistatic compound: the support material provides catalytic activity for polymerization while the antistatic compound component prevents agglomerate formation. This spatial and functional differentiation allows the system to simultaneously achieve high polymerization activity and prevent agglomerates, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent uses composite materials by combining support material (providing catalytic activity) with antistatic compound (preventing agglomeration) into a single supported antistatic compound system. This composite approach enables both polymerization activity and agglomerate prevention to coexist, as each component contributes its specific function without interfering with the other.
2Productivity
If fine polymer particles are present in the polymerization medium, then polymerization can proceed, but polymer agglomerates form and disrupt discharge and fluidization efficiency
Solution Approach 1:
The supported antistatic compound acts as an intermediary substance that mediates between the fine polymer particles and the reactor environment. It prevents the fine particles from aggregating into large agglomerates that would block discharge valves, while still allowing the particles to participate in polymerization. This intermediary function maintains both productivity and discharge efficiency.
Solution Approach 2:
The patent changes the physical and chemical parameters of the polymerization medium by introducing the supported antistatic compound, which modifies the surface properties of polymer particles and the electrostatic environment. This parameter change prevents agglomerate formation while maintaining fine particle dispersion, thereby preserving both polymerization rate and discharge efficiency.
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 effectively prevents polymer agglomerate formation and maintains high polymerization activity, reducing fouling in reactors and equipment while minimizing the negative effects on catalyst yield.
Implementation Method 1
the fines are believed to deposit and electrostatically adhere to the inner walls of the polymerization reactor
Implementation Method 2
contacting an antistatic compound with a support in the absence of a transition-metal-based catalyst component to obtain a supported antistatic compound
Data Source
AI summary
The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.