Impinging-Stream Reactor Ejectors for Catalyst Distribution
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Solution Overview
Problem
Current chemical reactors, such as fixed-bed and stirred kettle-type reactors, suffer from poor thermal conductivity, slow reaction rates, difficulty in catalyst replacement, and inefficient operation, leading to low productivity, complex side reactions, long reaction times, and high costs.
Innovation Solution
A multiphase catalytic tower-type impinging-stream reactor system is designed to enhance reaction efficiency by utilizing a plate or packed tower and a multiphase catalytic impinging-stream reaction kettle, with upper and lower ejectors, baffle plates, and filters, creating violent turbulence and forced circulation to improve catalyst distribution and contact between reactants, suitable for various two- or three-phase reaction systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed-bed reactor is used, then catalyst replacement is difficult, but thermal conductivity is poor
Solution Approach 1:
The reactor is divided into multiple independent modules (reaction modules, separation modules, heat exchange modules) that can be independently configured and replaced. Catalyst-containing modules can be individually replaced without affecting the entire reactor system, solving the catalyst replacement difficulty while maintaining good thermal conductivity through modular heat exchange components.
Solution Approach 2:
The patent transitions from traditional single-phase to multiphase reaction systems, adding dimensional complexity to the reaction process. This enables simultaneous achievement of good heat transfer (through liquid phase) and easy catalyst replacement (through phase separation mechanisms).
2Ease of operation
If stirred kettle-type reactor is used, then mixing is improved, but reaction rate is slow
Solution Approach 1:
The reactor employs periodic flow patterns and pulsing mechanisms to create intense mixing episodes followed by reaction periods. This periodic action achieves thorough mixing without requiring continuous high-energy stirring, thereby maintaining high reaction rates while ensuring complete mixing of reactants.
Solution Approach 2:
The patent uses fluid dynamics and hydrodynamic forces to achieve mixing through controlled flow patterns, pressure variations, and circulation loops. This eliminates mechanical stirring while maintaining effective mixing through hydraulic means, thus preserving high reaction rates.
3Ease of operation
If traditional reactors are used, then operation is simple, but productivity is low
Solution Approach 1:
The reactor system is designed for continuous operation with continuous feed, continuous reaction, and continuous product removal. This eliminates idle times between batches and maintains constant productive action, significantly increasing productivity while keeping operation simple through automated continuous processing.
Solution Approach 2:
Multiple functions (reaction, separation, heat exchange, circulation) are merged into an integrated system where processes occur simultaneously in a unified flow. This combining of functions increases productivity by eliminating sequential steps while maintaining operational simplicity through unified control.
4Reliability
If conventional reactors are used, then side reactions are complicated, but reaction time is long
Solution Approach 1:
The reactor systematically varies critical parameters (temperature, pressure, flow rate, concentration) along the reaction path to optimize selectivity and minimize side reactions. By dynamically adjusting parameters rather than maintaining constant conditions, the system achieves high selectivity in shorter reaction times.
Solution Approach 2:
The system performs preliminary optimization of reaction conditions and pre-positioning of catalysts/reactants to ensure optimal reaction pathways are established from the start. This preliminary action prevents formation of unwanted byproducts and reduces the time needed to achieve desired conversion without side reactions.
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 reactor system significantly enhances reaction rates and conversion rates, prevents catalyst deposition, ensures even catalyst distribution, and increases productivity while reducing energy consumption and operational complexity.
Implementation Method 1
creating violent turbulence and forced circulation to improve catalyst distribution and contact between reactants
Data Source
AI summary
A multiphase catalytic tower-shaped impinging-stream reactor in the form of a tower, the upper part of which is a plate or packed tower 4 and the lower part of which is a multiphase catalytic impinging-stream reaction kettle 2; the upper part and the lower part are separated by a flow channel plate 14 which has a plurality of round holes serving as flow channels 62; at the top of the reaction kettle 2 exists an upper ejector 3 and at the bottom of the reaction kettle 2 exists a lower ejector 8; near to the side wall of the reaction kettle 2 stands a baffle plate 5, which separates a static liquid zone within the reaction kettle 2 is disclosed.