Multistage Catalyst Injection System for Olefin Polymerization
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Solution Overview
Problem
Current solution polymerization processes for olefin polymerization face challenges in efficiently delivering and mixing multi-component catalysts, leading to potential fouling and plugging issues in reactor systems, which affects catalyst activity and reactor operation.
Innovation Solution
A method and apparatus for delivering a multi-component olefin polymerization catalyst, involving separate conduits for catalyst components and a diluent, where catalysts are mixed and contacted in specific sections to form a catalyst support and pre-polymerization catalyst before being introduced into the reactor, optimizing hold-up times and Craya-Curtet flows to prevent fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multi-component catalysts are delivered and mixed in conventional single-stage systems, then catalyst delivery is simplified, but fouling and plugging issues occur in reactor systems
Solution Approach 1:
The catalyst delivery system is segmented into multiple independent injection stages. Each stage delivers specific catalyst components through separate conduits and mixes them in dedicated mixing sections. This segmentation prevents premature mixing of all components, eliminating fouling and plugging issues while maintaining reliable reactor operation.
Solution Approach 2:
Catalyst components are prepared and delivered in separate streams with controlled hold-up times before final mixing. The preliminary action of separating component delivery prevents harmful interactions and precipitation that would cause fouling, while ensuring all components are ready for efficient mixing at the appropriate location.
2Productivity
If catalyst components are mixed immediately upon delivery, then catalyst formation is accelerated, but fouling and plugging occur in the system
Solution Approach 1:
The mixing process is segmented into multiple stages occurring at different locations. Catalyst components are mixed in controlled sections with appropriate residence times, accelerating formation while preventing the harmful effects of premature or uncontrolled mixing that cause fouling and plugging.
Solution Approach 2:
The system introduces intermediary mixing sections and diluent streams that mediate between catalyst component delivery and final catalyst formation. These intermediaries control the mixing process, enabling accelerated catalyst formation while preventing direct harmful interactions that cause fouling.
3Manufacturing precision
If hold-up time is extended to improve mixing, then catalyst formation efficiency increases, but reactor operation time is reduced due to fouling
Solution Approach 1:
The mixing process is divided into segmented stages with optimized hold-up times at each section. This segmentation achieves thorough mixing and efficient catalyst formation without extending the total hold-up time excessively, thereby preventing fouling and maintaining extended reactor operation time.
Solution Approach 2:
The system optimizes parameters such as hold-up time, flow rates, and mixing intensity at different stages. By changing these parameters appropriately in each section, the system achieves efficient catalyst mixing while controlling total residence time to prevent fouling and extend reactor operation.
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 enhances catalyst formation rates, reduces fouling, and extends reactor operation time by ensuring efficient mixing and delivery of catalysts, maintaining reactor efficiency and preventing premature precipitation.
Implementation Method 1
at least one first catalyst component soluble in a first solvent is delivered under pressure along with the first solvent to the first catalyst component mixing conduit via the first catalyst component delivery conduit
Implementation Method 2
the at least one first catalyst component soluble in the first solvent comes into contact with the at least one second catalyst component soluble in the second solvent within the first catalyst component mixing conduit to form a catalyst support
Implementation Method 3
optimizing hold-up times and Craya-Curtet flows to prevent fouling
Data Source
AI summary
This disclosure relates to a method and an apparatus for the delivery of a multi-component olefin polymerization catalyst to a polymerization reactor. The apparatus includes: a first catalyst component delivery conduit; a second catalyst component delivery conduit which is disposed within the first catalyst component delivery conduit; a first catalyst component mixing conduit; a third catalyst component delivery conduit which is disposed within the first catalyst component mixing conduit; a second catalyst component mixing conduit comprising an upstream section and a downstream section, the downstream section terminating within the polymerization reactor; and a diluent delivery conduit; the first and second catalyst component delivery conduits each being open-ended and co-terminating at the first catalyst component mixing conduit; the first catalyst component mixing conduit and the third catalyst component delivery conduit each being open-ended and co-terminating at the upstream section of the second catalyst component mixing conduit; and the diluent delivery conduit terminating at the downstream section of the second catalyst component mixing conduit.