Fluidized Bed Polymerization Reactor With Vortex-Assisted Catalyst Removal
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Solution Overview
Problem
Conventional fluidized bed polymerization reactors face limitations in increasing production rate and frequency of catalyst-reactant contact, leading to reduced production per unit volume and increased maintenance and operating costs, with existing solutions causing drastic changes in reaction conditions and additional investments.
Innovation Solution
A fluidized bed polymerization reactor design featuring a plenum, distribution plate, and inlet nozzle configuration that forms an acute angle of less than 90° with the plenum tangent and maintains a specific distance between the dispersion plate and inlet nozzle, promoting a vortex phenomenon to enhance catalyst removal and improve process stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluidized bed polymerization reactor is used, then heat transfer properties and temperature distribution are excellent, but production amount per unit volume is limited due to low catalyst-reactant contact frequency
Solution Approach 1:
The reactor is divided into multiple zones: a fluidized bed zone for polymerization and a slurry zone for catalyst concentration and reaction enhancement. This segmentation allows different regions to perform specialized functions, with the slurry zone specifically designed to increase catalyst-reactant contact frequency while the fluidized bed maintains excellent heat transfer properties.
Solution Approach 2:
A slurry phase is introduced as an intermediary medium between the catalyst and reactants. This slurry contains concentrated catalyst particles suspended in liquid, which enhances the contact frequency between catalyst and reactants. The slurry acts as a mediator that facilitates more frequent and effective catalyst-reactant interactions without disrupting the fluidized bed's heat transfer characteristics.
2Productivity
If condensation-inducing substances are added to circulating gas to increase production, then production amount increases, but reaction conditions change drastically and additional investment costs are incurred
Solution Approach 1:
Instead of adding condensation-inducing substances to the circulating gas, the invention creates a separate slurry zone that replicates the catalytic reaction function in a controlled environment. This slurry zone copies the essential polymerization function while maintaining stable reaction conditions, avoiding the need to modify the circulating gas composition and thus preventing drastic changes in overall reaction conditions.
Solution Approach 2:
The catalytic reaction function is extracted from the circulating gas phase and relocated to a dedicated slurry zone. This extraction allows the polymerization reaction to occur in a controlled slurry environment where catalyst and reactants are concentrated, increasing production without requiring changes to the circulating gas composition or adding condensation-inducing substances.
3Productivity
If condensation-inducing substances are added to circulating gas, then production amount increases, but pump installation and condensate storage are required
Solution Approach 1:
The invention extracts the catalyst concentration and reaction enhancement function from the gas phase and places it in a dedicated slurry zone. This eliminates the need to add condensation-inducing substances to the circulating gas, thereby removing the requirement for additional pumps and condensate storage equipment while still achieving increased production.
Solution Approach 2:
The slurry zone serves multiple functions simultaneously: it concentrates catalyst particles, enhances reactant-catalyst contact, and facilitates polymerization reaction. This self-service approach within the slurry zone achieves production enhancement without requiring external辅助设备 such as pumps for injecting condensation-causing substances or storage systems for condensates.
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 design increases polymerization production rate, reduces maintenance and operating costs, and allows switching between High Sorption Mode and Non-Sorption Mode, preventing process shutdowns due to residual catalyst or fine particles, while ensuring stable operation.
Implementation Method 1
promoting a vortex phenomenon to enhance catalyst removal and improve process stability
Implementation Method 2
the solid reactant also moves like a fluid. That makes solid processing easy
Data Source
AI summary
Proposed is a fluidized bed polymerization reactor, including a plenum located in a lower part of the fluidized bed polymerization reactor, a distribution plate located inside the plenum and having a hollow center, a discharge pipe discharging polymer particles, as connected to the hollow center of the dispersion plate and having a hollow cylindrical structure, and an inlet nozzle located on the outer surface of the plenum. The fluidized bed polymerization reactor is characterized in that an acute angle (θ) between a long axis of the inlet nozzle and a tangent of the plenum at an intersection with the long axis of the inlet nozzle is less than 90°, and a distance (d) between a lowermost end of the dispersion plate and an uppermost end of the inlet nozzle is 100 mm or more.