Electrostatic Spray Atomization for Low-Temperature Flavor Encapsulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spray drying systems for food and flavor encapsulation require high temperatures, leading to flavor profile changes, energy inefficiency, and challenges in controlling particle size and morphology.
Innovation Solution
A spray drying process using High-Voltage, Low-Current High Frequency Alternating-Current (HVLCHFAC) or High-Voltage, Low-Current Low Frequency Alternating-Current (HVLCLFAC) applied at the site of atomization, facilitated by an electrical resonant transformer, allows for encapsulation without heat, reducing processing temperatures and improving control over particle size and morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spray drying systems use high temperatures (140°C to 220°C inlet) to induce carrier film formation and dehydration, then proper encapsulation and free-flowing powder are achieved, but flavor profile changes and loss of volatile components occur
Solution Approach 1:
The patent changes the fundamental parameter from thermal energy to electrical energy by applying high-voltage electrostatic charge to the atomized emulsion. This allows carrier film formation and dehydration to occur through electrostatic forces rather than thermal heating, thereby achieving reliable encapsulation while preserving the original flavor profile of heat-sensitive food and flavor ingredients
Solution Approach 2:
The patent replaces the thermal field (heat-based drying mechanism) with an electrostatic field (high-voltage charge-based mechanism). By substituting the thermal energy source with electrical energy, the system achieves the same encapsulation and dehydration effects without the harmful thermal degradation of volatile flavor compounds
2Reliability
If conventional spray drying systems use high temperatures to achieve proper carrier film formation, then dehydration and encapsulation are effective, but energy consumption increases
Solution Approach 1:
The patent fundamentally changes the energy parameter from thermal to electrical by applying high-voltage electrostatic charge to the atomized emulsion. This electrostatic field enables carrier film formation and water removal through dielectric heating and electrostatic forces, achieving reliable encapsulation with significantly reduced energy consumption compared to conventional thermal spray drying
3Productivity
If conventional spray drying systems use high temperatures for rapid dehydration, then processing time is reduced, but flavor retention deteriorates
Solution Approach 1:
The patent replaces the thermal dehydration mechanism with an electrostatic dehydration mechanism. By applying high-voltage charge to the atomized emulsion, water molecules are removed through electrostatic forces and dielectric heating at much lower temperatures, achieving rapid processing speeds while preserving volatile flavor compounds that would otherwise be lost to thermal degradation
4Temperature
If electrostatic charge is applied to high solids, high viscosity emulsion prior to atomization (Beetz et al. approach), then lower drying temperatures are achieved, but control over particle size distribution is limited
Solution Approach 1:
The patent applies the preliminary action of atomization first to break the emulsion into fine droplets, then applies the electrostatic charge to the already-atomized droplets. This sequence allows precise control over particle size through atomization parameters while the subsequent electrostatic charging enables low-temperature drying without compromising the achieved particle size distribution
Solution Approach 2:
The patent segments the process into two distinct stages: first atomization to control particle size and morphology, then electrostatic charging for low-temperature drying. This segmentation allows independent optimization of each stage, achieving both precise particle size control and reduced drying temperatures
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 process achieves encapsulation with improved flavor retention, reduced energy consumption, and enhanced control over particle size and morphology, resulting in a free-flowing, encapsulated powder with a flavor profile comparable to the original ingredient.
Implementation Method 1
applying high-voltage, low-current high frequency alternating-current, or high-voltage, low-current low frequency alternating-current, at the site of atomization
Implementation Method 2
The alternating current applies energy to the emulsion being atomized, enabling lower temperatures to be used for the drying gas in the dryer
Data Source
AI summary
Disclosed is a spray drying system and process for encapsulating a core material, such as a volatile flavor oil, within a carrier or wall material. The process is achieved by atomizing a liquid emulsion comprising the core material, the wall material, and a liquid solvent, applying a high-voltage, low-current, high frequency alternating-current charge or a high-voltage, low-current, low frequency alternating-current charge at the site of atomization, and drying the atomized emulsion into an encapsulated, free-flowing powder. Applying a high-voltage, low current alternating-current at the site of atomization allows the spray drying to be accomplished at significantly reduced temperatures, in particular, at inlet temperatures in the range of 25° C. to 150° C., and outlet temperatures in the range of 25° C. to 110° C. The low drying temperatures impart improvements in the resulting encapsulated powdered product, including better retention of volatile flavor components, a flavor profile comparable to that of the starting liquid formulation, and better hydration and dissolution in water-based applications.