Continuous Acoustic Chemical Microreactor for Mixing and Heat Transfer
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Solution Overview
Problem
Existing mixers and microreactors face inefficiencies in mixing and reacting materials due to dead zones, limited scalability, and inadequate heat transfer, particularly in highly exothermic reactions, with existing ultrasonic mixing technologies being limited to surface absorption and requiring turbulent flow.
Innovation Solution
A continuous acoustic chemical microreactor system utilizing low-frequency acoustic agitation (LFAA) with mechanical resonance, high accelerations, and elongated tubes to create uniform shear fields and efficient mixing, incorporating features like interstitial fluid circulation for heat management and midstream reactant introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional ultrasonic mixing is used, then surface absorption of acoustic energy occurs, but mixing uniformity deteriorates due to dead zones and limited penetration
Solution Approach 1:
The patent applies low-frequency acoustic agitation (LFAA) that generates mechanical vibrations throughout the entire reaction volume, creating uniform shear fields that eliminate dead zones. The vibrations are propagated through the elongated tube walls, ensuring consistent mixing across the entire cross-section rather than just at the surface.
Solution Approach 2:
The patent replaces conventional ultrasonic mechanical mixing with acoustic field-based mixing. By using low-frequency acoustic waves that penetrate the entire reaction volume, the system substitutes surface-level mechanical contact with volumetric acoustic energy transmission, achieving uniform mixing without dead zones.
2Productivity
If conventional microreactors are used, then reaction processing occurs, but heat transfer efficiency deteriorates in highly exothermic reactions
Solution Approach 1:
The patent transitions from conventional planar heat exchange surfaces to a three-dimensional interstitial cooling system. The coolant flows through the interstitial space surrounding the elongated tube, creating radial heat transfer pathways that significantly increase the effective heat exchange surface area and improve thermal management of exothermic reactions.
Solution Approach 2:
The patent implements a nested configuration where the elongated reaction tube is positioned within the continuous process vessel, and the coolant flows through the interstitial region between them. This nested arrangement maximizes the heat transfer surface area while maintaining a compact structure, allowing efficient heat removal from highly exothermic reactions.
3Productivity
If conventional mixers are used, then materials are mixed, but scalability deteriorates due to dead zones and limited mixing efficiency
Solution Approach 1:
The patent uses low-frequency acoustic vibrations that scale effectively with system size. The acoustic field can be uniformly distributed throughout elongated tubes of various lengths, maintaining consistent mixing performance from laboratory to industrial scale without the dead zones that plague conventional mixers.
Solution Approach 2:
The patent implements continuous acoustic agitation throughout the entire length of the elongated tube, ensuring that mixing action is maintained continuously along the entire reaction path. This continuous useful action eliminates the intermittent mixing problems of batch systems and enables scalable continuous processing.
4Reliability
If high-frequency vibration is used to inhibit molecular bonding, then reaction control improves, but energy consumption increases
Solution Approach 1:
The patent changes the frequency parameter from high-frequency ultrasonic ranges to low-frequency acoustic ranges. This parameter change maintains the ability to control molecular interactions and inhibit unwanted bonding while significantly reducing energy consumption, as low-frequency acoustic waves require less energy to propagate through the system.
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 system achieves rapid, uniform mixing and reaction with minimal dead zones, enhanced heat transfer, and scalability, outperforming conventional microreactors in mixing time and quality, and gas-liquid mass transport coefficients.
Implementation Method 1
a continuous acoustic mixer (CAM) is a device that can impart acoustic energy onto one or more materials passing through it
Implementation Method 2
The characteristics of vibration is set to a frequency and amplitude so as to inhibit the bonding between molecules because the molecule of the fluid within the micro-channel generates micro-vibration
Implementation Method 3
The inner surface of the elongated tube accelerates the reactants in alternating upward and downward directions
Implementation Method 4
The interstitial region can be configured to receive the cooling fluid and bring it into contact with an outer surface of the elongated tube
Data Source
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AI summary
A continuous acoustic chemical microreactor system is disclosed. The system includes a continuous process vessel (CPV) and an acoustic agitator coupled to the CPV and configured to agitate the CPV along an oscillation axis. The CPV includes a reactant inlet configured to receive one or more reactants into the CPV, an elongated tube coupled at a first end to the reactant inlet and configured to receive the reactants from the reactant inlet, and a product outlet coupled to a second end of the elongated tube and configured to discharge a product of a chemical reaction among the reactants from the CPV. The acoustic agitator is configured to agitate the CPV along the oscillation axis such that the inner surface of the elongated tube accelerates the one or more reactants in alternating upward and downward directions along the oscillation axis.