Circulation Reactor for High-Viscosity Carboxylic Acid Derivatives
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Solution Overview
Problem
Existing methods for preparing carboxylic acid derivatives using heterogeneous catalysts face challenges with high-viscosity mixtures, as fixed bed reactors are limited to low-viscosity reactions due to pressure drop issues and require solvents to handle higher viscosities, which increases costs and complexity.
Innovation Solution
A circulation reactor design with a freely distributed catalyst in the reaction vessel and gas input for mixing, allowing for solvent-free processing of both low and high-viscosity mixtures, ensuring catalyst reusability by minimizing mechanical and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed bed reactor is used to process high-viscosity mixtures, then the reaction can proceed, but the pressure drop increases significantly leading to reduced conveying rates and economically unviable process conditions
Solution Approach 1:
The reaction system is segmented into a circulation reactor where high-viscosity mixtures are processed in batches or continuous circulation mode, avoiding the continuous high-pressure drop through a fixed bed. The catalyst is separated into a removable component that can be filtered out, allowing the reaction mixture to circulate without enduring sustained high pressure drops.
Solution Approach 2:
The system transitions from a static fixed bed configuration to a dynamic circulation system where the reaction mixture is continuously pumped through the reactor and back to the reservoir. This dynamic approach allows control over residence time and pressure conditions, preventing the cumulative pressure drop issues of fixed bed reactors.
2Ease of operation
If solvents are added to handle high-viscosity mixtures in fixed bed reactors, then the flow improves, but the process complexity and costs increase due to additional solvent recovery steps
Solution Approach 1:
The invention extracts and eliminates the need for solvent addition by using a circulation reactor design that handles high-viscosity mixtures directly. The system takes out the solvent recovery equipment and operations from the process flow, simplifying the overall system while maintaining operational ease through controlled circulation and gas sparging.
Solution Approach 2:
The circulation reactor system is self-sufficient in handling high-viscosity mixtures without requiring external solvent assistance. The gas sparging mechanism and circulation pumping automatically manage the flow characteristics of viscous materials, making the process self-serviceable and eliminating complex solvent recovery infrastructure.
3Ease of operation
If conventional stirred reactors are used with heterogeneous catalysts, then mixing is achieved, but mechanical forces cause catalyst disintegration and particle size reduction compromising reusability
Solution Approach 1:
The invention replaces the mechanical stirring system with a gas sparging mechanism that induces circulation and mixing through gas bubbles rising through the reaction mixture. This substitution eliminates the direct mechanical contact and shear forces from impellers that would otherwise disintegrate catalyst particles, preserving catalyst integrity and reusability.
Solution Approach 2:
The system uses pneumatic action through gas sparging to achieve mixing and circulation instead of mechanical stirring. The gas flow creates hydrodynamic conditions that mix the reaction mixture while gently handling the heterogeneous catalyst, preventing mechanical degradation and maintaining catalyst particle size for repeated use.
4Ease of operation
If a fixed bed reactor is used, then catalyst removal is simplified, but the reactor volume required is significantly larger and cleaning is exceptionally laborious
Solution Approach 1:
The reactor system is segmented into a compact reaction chamber and a separate reservoir vessel. The catalyst is contained in a removable filterable form factor that can be separated from the circulation loop, allowing efficient catalyst removal without requiring a large fixed bed structure. This segmentation enables a much smaller overall reactor volume while maintaining ease of catalyst removal.
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
Enables efficient and cost-effective preparation of carboxylic acid derivatives from high-viscosity mixtures without solvents, with catalyst reuse maintaining high conversion rates across multiple batches, overcoming the limitations of traditional fixed bed reactors.
Implementation Method 1
gas input for mixing
Implementation Method 2
The reaction mixture is circulated out of a reservoir vessel through a reaction vessel and back into the reservoir vessel
Data Source
AI summary
Process for heterogeneously catalyzed preparation of carboxylic acid derivatives using a reactor system comprising at least one reservoir vessel V, feed lines, at least one pump and a reaction vessel R, characterized in that a permanent gas flow through the reaction vessel R is applied through a gas feed line, and in which a reaction chamber in which the heterogeneous catalyst is not introduced in tightly packed form is delimited by at least two filters such that both the mass flow and the gas flow are passed through the reaction chamber.