Electrostatic Spray Drying for Thermal Degradation
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Solution Overview
Problem
Conventional spray drying processes degrade active ingredients due to high temperatures, leading to undesirable modifications such as evaporation and oxidation, which result in reduced performance and revenue losses, especially in the pharmaceutical and flavor industries.
Innovation Solution
The method involves forming a slurry with a liquid solvent and active ingredient, applying an electrostatic charge to the slurry, and atomizing it to produce charged particles, which then undergo coulombic fission in a non-heated drying chamber, allowing for solvent evaporation without heat, thereby preserving the active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heated air is used for spray drying, then drying efficiency is improved, but active ingredients are degraded due to high temperatures
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperatures (180-200°C) to low temperatures (below boiling point of water, preferably 20-80°C). This parameter change allows drying to proceed at rates sufficient for commercial viability while preventing thermal degradation of active ingredients such as flavors, fragrances, and medicaments
Solution Approach 2:
The invention replaces the thermal field (heated air) with an electrostatic field. By applying electrostatic charges to droplets and using charged plates or electrodes, the system creates conditions for rapid solvent evaporation and particle separation without relying on high temperature thermal energy, thus eliminating thermal degradation while maintaining drying efficiency
2Loss of time
If conventional spray drying is used, then rapid drying is achieved, but active ingredients undergo evaporation and oxidation
Solution Approach 1:
The invention changes multiple parameters simultaneously: temperature (lowered to prevent degradation), electrostatic charge (applied to enhance evaporation and separation), and atmospheric composition (controlled to prevent oxidation). These parameter changes enable rapid drying while preserving active ingredients
Solution Approach 2:
The invention employs a controlled atmospheric environment, preferably inert or low-oxygen conditions, during the drying process. This prevents oxidation of active ingredients while the electrostatic field and controlled temperature facilitate rapid solvent evaporation, achieving both fast drying and ingredient preservation
3Speed
If high temperature drying is applied, then solvent evaporation rate is improved, but product quality deteriorates
Solution Approach 1:
The invention substitutes thermal energy with electrostatic energy to drive the evaporation process. Charged droplets placed in an electric field experience forces that enhance solvent removal rates without the need for high temperatures, thereby maintaining both high evaporation speed and high product quality
Solution Approach 2:
The invention changes the energy input parameter from thermal to electrostatic, and adjusts temperature to a low range (20-80°C). This parameter transformation enables rapid evaporation through electrostatic field effects while the low temperature prevents quality deterioration, resolving the contradiction between speed and precision
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 results in a dried powder with minimal degradation of active ingredients, maintaining their weight percentage and stability over time, even at elevated temperatures, and significantly improves flavor retention and shelf-life.
Implementation Method 1
suspending the electrostatically charged, wet particles for a sufficient time to permit repulsive forces induced by the electrostatic charge on at least some wet particles to cause at least some of such particles to divide into wet sub-particles
Implementation Method 2
continuing the suspending step, without the presence of any heated drying fluids, for a sufficient time to drive off a sufficient amount of the liquid solvent within most of the wet particles to leave a plurality of dried particles
Data Source
AI summary
Methods and apparatus provide for spray drying a liquid product into a dried powder without applying heat, including: forming a slurry including a liquid solvent, a carrier, and an active ingredient; applying an electrostatic charge to the slurry; atomizing the charged slurry to produce a plurality of electrostatically charged, wet particles; suspending the electrostatically charged, wet particles for a sufficient time to permit repulsive forces induced by the electrostatic charge on at least some wet particles to cause at least some of such particles to divide into wet sub-particles; and continuing the suspending step, without the presence of any heated drying fluids, for a sufficient time to drive off a sufficient amount of the liquid solvent within most of the wet particles to leave a plurality of dried particles (the powder), each dried particle containing the active ingredient encapsulated within the carrier.