Vacuum Reactor for Uniform API Coating
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Solution Overview
Problem
Existing techniques for coating active pharmaceutical ingredients (APIs) face challenges such as non-uniform coatings, particle agglomeration, and scalability issues, leading to inconsistent drug product formulations and high manufacturing costs.
Innovation Solution
A stationary vacuum reactor with a paddle assembly and gas injection system that agitates particles and injects process gases tangentially through the reactor sidewall, ensuring uniform coating and preventing agglomeration, allowing for high-volume manufacturing of API particles with thin, consistent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray coating is used to coat API particles, then the coating process can be industrially scaled, but non-uniform coatings and particle agglomeration occur
Solution Approach 1:
The coating process is segmented into multiple sequential stages: particle injection, coating material deposition, and drying/setting. This segmentation allows each stage to be optimized independently, preventing agglomeration during material application while maintaining industrial scalability through continuous processing.
Solution Approach 2:
The system dynamically adjusts processing parameters including gas flow rates, coating material delivery rates, and chamber temperature during operation. This dynamic control ensures uniform coating distribution while preventing particle agglomeration, resolving the contradiction between coating quality and scalability.
2Adaptability or versatility
If plasma polymerization is used for API coating, then certain precursor chemistries can be applied, but the process is difficult to scale and can degrade sensitive APIs
Solution Approach 1:
The invention replaces plasma-based chemical processes with a mechanical spray coating system that delivers coating materials through controlled aerosol injection. This substitution eliminates the scalability limitations of plasma polymerization while maintaining versatility through the ability to use various coating materials including polymers, metals, and ceramics.
3Manufacturing precision
If hot-wire CVD is used for coating, then coating deposition can be achieved, but the process is poorly scalable and unsuitable for thermally sensitive APIs
Solution Approach 1:
The system fundamentally changes the temperature parameter from high-temperature hot-wire CVD conditions to low-temperature spray drying conditions. This parameter change enables coating of thermally sensitive APIs while maintaining scalability through continuous processing and reduced energy requirements.
4Manufacturing precision
If rotary reactors with ALD are used for coating, then inorganic coatings can be deposited, but the process is not suitable for organic polymer coatings and high-volume manufacturing
Solution Approach 1:
The spray coating system is designed as a universal platform that can process multiple coating material types including organic polymers, inorganic metals, and ceramic materials. The system's versatility is achieved through adjustable spray parameters and material delivery mechanisms that accommodate different material properties, enabling both organic and inorganic coating applications in a single reactor design.
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 solution achieves uniform coating of API particles, preventing agglomeration and enabling high-volume manufacturing with reduced costs and improved drug product consistency, allowing for higher API loading and enhanced pharmaceutical formulations.
Implementation Method 1
evacuating the chamber through a vacuum port in an upper portion of the chamber
Implementation Method 2
a chemical delivery system to deliver a first fluid, and a first gas injection assembly to receive the first fluid from the chemical delivery system and having apertures configured to inject a first reactant or precursor gas into the lower portion of the chamber
Data Source
AI summary
A reactor for coating particles includes a stationary vacuum chamber that has a lower portion that forms a half-cylinder and an upper portion and that holds a bed of particles to be coated, a vacuum port in the upper portion of the chamber, a paddle assembly, and a gas injection assembly that includes a vaporizer to convert a first liquid to a first reactant or precursor gas, a manifold to receive the first reactant or precursor gas from the vaporizer, and a plurality of channels leading from the manifold to a plurality of apertures located in the lower portion of the chamber.