Catalytic Paste Feeding for Antistatic Polymerization Reactors
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Solution Overview
Problem
In gas-phase olefin polymerization processes, the formation of polymer agglomerates in reactors leads to disruptions such as plugging of discharge valves and reduced fluidization efficiency, primarily due to fine polymer particles and electrostatic charges, for which existing methods to introduce antistatic compounds are complex and energy-intensive, especially for solid additives that require heating to maintain flowability.
Innovation Solution
A method involving the preparation of a catalytic paste by dispersing catalyst powder and antistatic compounds in oil, followed by adding a molten thickening agent to create a semi-fluid paste that preserves catalyst morphology and allows for the introduction of antistatic agents directly into the polymerization reactor, reducing electrostatic charges and fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid antistatic additives are fed directly to the polymerization reactor, then the antistatic function is achieved, but heating devices must be installed on feed lines to maintain flowability, increasing device complexity and energy consumption
Solution Approach 1:
The patent combines the antistatic additive with the catalyst system into a single composite catalyst composition. This merging eliminates the need for separate feed lines and heating devices for antistatic additives, as both the catalyst and antistatic agent are delivered together through the same feed system. The composite catalyst contains the antistatic additive dispersed within the catalyst matrix, allowing simultaneous delivery of both components to the reactor.
Solution Approach 2:
The catalyst system is given multiple functions: it serves both as the polymerization catalyst and as the carrier for the antistatic additive. The composite catalyst composition performs dual roles - catalyzing polymerization and providing antistatic functionality - thereby eliminating the need for separate antistatic additive feeding infrastructure and reducing overall system complexity.
2Reliability
If solid antistatic additives are fed directly to the polymerization reactor, then the antistatic function is achieved, but heating devices increase energy consumption to maintain additive flowability
Solution Approach 1:
The antistatic additive is merged with the catalyst system into a composite composition. This combination allows the antistatic agent to be delivered along with the catalyst through the same feed lines without requiring separate heating devices, thereby eliminating the additional energy consumption that would be required to heat dedicated antistatic additive feed lines.
Solution Approach 2:
The antistatic additive is pre-combined with the catalyst system during catalyst preparation, forming a composite catalyst composition. This preliminary action ensures that the antistatic additive is already in the correct form and location within the catalyst system, eliminating the need for subsequent heating and flow management of separate antistatic additive feed lines.
3Productivity
If fine polymer particles are present in the polymerization medium, then catalyst activity is maintained, but polymer agglomerates form due to electrostatic adhesion of fines to reactor walls
Solution Approach 1:
The antistatic additive acts as an intermediary substance that neutralizes electrostatic charges on fine polymer particles. By incorporating this antistatic agent into the catalyst system, fine particles are treated in-situ, preventing their electrostatic adhesion to reactor walls and subsequent agglomerate formation, while maintaining catalyst activity and fine particle presence in the medium.
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 method effectively prevents the formation of polymer agglomerates by maintaining catalyst morphology and introducing antistatic agents within the reactor, ensuring smooth polymer discharge and reducing fouling issues, thus enhancing reactor efficiency and reducing energy consumption.
Implementation Method 1
adding, under mixing conditions, a molten thickening agent to said suspension from step a), while maintaining said suspension at a temperature such that said thickening agent solidifies on contact with said suspension
Implementation Method 2
the reduction of the electrostatic charge by introducing antistatic agents inside the reactor
Data Source
AI summary
A method for feeding an antistatic compound to a polymerization reactor comprising the steps of: a) dispersing, under mixing conditions, a catalyst powder and an antistatic compound in an oil, so as to form a suspension of catalyst powder and antistatic compound in said oil; b) successively adding, under mixing conditions, a molten thickening agent to said suspension from step a), while maintaining said suspension at a temperature such that said thickening agent solidifies on contact with said suspension; c) transferring the product obtained from b) to a polymerization reactor.