Thermolabile Substance Encapsulation via Continuous Freeze-Drying
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Solution Overview
Problem
Current methods for drying and encapsulating thermolabile substances, such as spray drying and freeze-drying, face limitations including degradation of labile products, high energy consumption, and industrial scalability issues, while alternative techniques like flow focusing and electrospraying are limited by production capacity and encapsulation efficiency.
Innovation Solution
A facility and method utilizing an injection unit with a nebuliser or electronebuliser, a drying unit operating at controlled temperature, and a collection unit to produce microcapsules efficiently, avoiding high-temperature drying and enabling continuous, scalable production of micro, submicro, and nanoparticles or nanocapsules, using an external electric field for droplet control and monodispersity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray drying is used for industrial encapsulation, then high production capacity and continuous operation are achieved, but thermolabile substances are degraded due to high temperature
Solution Approach 1:
The invention changes the temperature parameter from high (spray drying) to low (freeze-drying) while maintaining continuous operation capability. The freeze-drying process operates at temperatures below freezing point, preventing thermal degradation of thermolabile substances while achieving industrial-scale production through continuous feeding and processing.
Solution Approach 2:
The invention utilizes phase transition of water from liquid to solid (freezing) and then from solid to gas (sublimation) under vacuum conditions. This phase transition mechanism enables drying at low temperatures, avoiding thermal damage to sensitive substances while maintaining high productivity through continuous processing.
2Object-affected harmful factors
If freeze-drying is used for encapsulation of labile products, then product stability is maintained, but energy consumption is very high and scalability is difficult
Solution Approach 1:
The invention implements continuous freeze-drying operation where the feed solution is continuously fed into the freezing chamber, frozen, and then continuously sublimated and dried. This eliminates the batch-to-batch idle time and energy wastage, maintaining product stability through low temperature while significantly reducing overall energy consumption and enabling easy scalability.
Solution Approach 2:
The invention replaces the energy-intensive mechanical heating and drying system with a vacuum-based sublimation system. By creating a vacuum environment, the drying process occurs at low temperatures through sublimation, dramatically reducing energy consumption while maintaining continuous operation capability for industrial scalability.
3Manufacturing precision
If flow focusing or electrospraying is used for microcapsule production, then control over droplet size is improved, but production capacity remains low
Solution Approach 1:
The invention merges the advantages of flow focusing (precise droplet size control through coaxial flow) with continuous freeze-drying processing. The electrospraying or flow focusing injector produces monodisperse droplets with controlled size, which are then continuously frozen and dried, achieving both high manufacturing precision and high production capacity in an integrated system.
Solution Approach 2:
The invention performs preliminary droplet formation with precise size control using electrospraying or flow focusing before the main drying process. This preliminary action creates uniformly sized droplets that are then continuously processed through freezing and sublimation, ensuring both high manufacturing precision and maintaining continuous production flow for high capacity.
4Object-affected harmful factors
If low-melting-point oils are used for spray cooling, then thermolabile materials are protected, but the process is reversible and requires refrigeration
Solution Approach 1:
The invention extracts the thermolabile substance from the reversible low-melting-point oil system and encapsulates it in a stable frozen matrix through continuous freeze-drying. The substance is protected during processing at low temperatures, then obtained as a stable dry powder that does not require refrigeration, eliminating the storage requirement while maintaining thermal protection during the encapsulation process.
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
This approach allows for the stable encapsulation of thermolabile substances like probiotics and polyunsaturated fatty acids, enhancing bioavailability and protection from environmental factors, with improved industrial scalability and efficiency compared to existing methods.
Implementation Method 1
applying a counter-current of hot air to an aerosol generated by a sprayer containing the product
Implementation Method 2
electronebuliser, a drying unit arranged after the injection unit
Implementation Method 3
a drying unit arranged after the injection unit and comprising a longitudinal receptacle which preferably has a cylindrical configuration and which is arranged with its longitudinal direction horizontal and which has sufficient length to allow the evaporation of all the solvent of the droplets
Implementation Method 4
one collection unit arranged after the drying unit which is configured to separate the microcapsules generated from the drying gas
Data Source
AI summary
A facility for industrial drying and/or encapsulation of thermolabile substances comprising at least one injection unit (1) wherein the thermolabile substance is introduced, an encapsulating material when the facility is used to encapsulate, a solvent, additives and an injection gas flow for obtaining droplets from the thermolabile substance. It further comprises a drying unit (2) through which the droplets and a drying gas are introduced for evaporating the solvent and comprises a collection unit (3) configured to separate the microcapsules generated from the drying gas and which is selected from a cartridge filter collector, a cyclone collector or a combination of the two. It also describes a method for the industrial encapsulation of thermolabile substances which is carried out at the proposed facility.