Taylor Reactor Mixing for Uniform, Scalable Capsule Particle Production
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Solution Overview
Problem
Existing methods for manufacturing capsule particles, particularly lipid nanoparticles for nucleic acid delivery, face challenges in scalability, uniformity, and reproducibility, with batch methods being unsuitable for large-scale production and continuous methods resulting in large particle sizes and poor quality.
Innovation Solution
A capsule particle manufacturing method using a Taylor reactor, which involves a rotatable inner cylinder within an outer cylinder, with independent or merged inlets for injecting particle-forming and enclosed components, allowing for controlled mixing in an annular reaction chamber to produce uniform particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dropping mixing method is used for manufacturing capsule particles, then the manufacturing process is simple, but the method is unsuitable for continuous production and produces non-uniform particle quality
Solution Approach 1:
The patent replaces the mechanical dropping mixing method with a microfluidization method that uses high-speed liquid flow and hydrodynamic forces to mix components. The microfluidizer generates intense shear forces and turbulence that rapidly and uniformly mix the particle-forming component and enclosed component, enabling continuous production while maintaining simplicity.
Solution Approach 2:
The patent employs hydraulic principles by using high-velocity liquid streams in the microfluidization chamber. The particle-forming component and enclosed component are forced through a narrow gap at high speed, creating hydrodynamic mixing that enables continuous production. The hydraulic pressure and flow rate control the mixing intensity and particle formation, achieving both continuity and uniformity.
2Productivity
If an in-line mixing method is used, then continuous production is enabled, but the obtained particle has large size, non-uniform quality, and poor reproducibility
Solution Approach 1:
The patent transitions from conventional one-dimensional or two-dimensional mixing to three-dimensional turbulent mixing in the microfluidization chamber. The high-velocity jet creates complex three-dimensional flow patterns with intense turbulence and eddies that thoroughly mix components throughout the entire volume, producing uniform particles with consistent size and quality.
Solution Approach 2:
The patent utilizes periodic turbulence and flow fluctuations in the microfluidization process. The high-speed liquid stream creates periodic eddies and recirculation zones that continuously redistribute components, ensuring uniform mixing and particle formation. This periodic hydrodynamic action maintains consistent particle quality during continuous production.
3Manufacturing precision
If a microchannel mixing method is used, then particle size can be controlled to be small with high reproducibility, but the production amount is low due to small flow path
Solution Approach 1:
The patent merges the advantages of microchannel mixing with high-velocity jet mixing. The microfluidizer combines precise component delivery (like microchannels) with intense hydrodynamic mixing (like turbulent flow), achieving both small uniform particle size and high production capacity. The merged approach maintains the precision of micro-scale control while enabling macro-scale production volumes.
Solution Approach 2:
The patent changes key parameters including liquid flow rate, pressure, and viscosity to optimize particle formation. By adjusting the flow rate and pressure in the microfluidization chamber, the patent controls the intensity of mixing and the size of formed particles. This parameter control enables high reproducibility of particle size while maintaining high production throughput.
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 method enables the production of uniform capsule particles with controlled sizes and high reproducibility, suitable for large-scale manufacturing, enhancing the delivery of nucleic acids like mRNA.
Implementation Method 1
a Taylor reaction is performed in a Taylor reactor
Implementation Method 2
the inner cylinder is rotatably disposed in the outer cylinder and forms a reaction chamber having an annular shape between the inner cylinder and the outer cylinder
Data Source
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AI summary
An object of the present invention is to provide a capsule particle manufacturing method. A method of manufacturing a capsule particle by using a Taylor reactor is provided.