Vacuum Screw Drying Reactor for Preserving Particle Size
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Solution Overview
Problem
Existing drying methods for fluid-comprising materials, such as vacuum drying and fluidized bed drying, are time-consuming, agglomerate particles, and cause abrasion and friability, failing to preserve particulate properties and particle size distribution.
Innovation Solution
A screw conveyor drying reactor with a first screw conveyor housing and an outer vacuum housing, featuring a gas- and liquid-permeable but solid-impermeable wall section, a conveying screw connected to a drive motor, and a vacuum housing for controlled drying, which minimizes agglomeration and abrasion by gentle transport and vacuum application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum drying is used, then solvent residues are removed, but drying is time-consuming and particles undergo abrasion and friability
Solution Approach 1:
The patent utilizes vacuum drying with controlled phase transition of solvent from liquid to vapor phase. The vacuum environment lowers the boiling point of the solvent, enabling rapid evaporation at lower temperatures, which preserves particle integrity while reducing drying time compared to conventional atmospheric drying methods.
Solution Approach 2:
The patent employs a vacuum environment (inert atmosphere without oxygen) to conduct drying. This vacuum environment prevents oxidation of particles during drying and allows for rapid solvent evaporation at reduced temperatures, thereby preserving particulate properties while accelerating the drying process.
2Productivity
If fluidized bed drying is used, then drying is rapid and efficient, but particles granulate to form agglomerates with high abrasion and friability
Solution Approach 1:
The patent replaces the mechanical fluidized bed system with a vacuum drying system using a drying chamber and vacuum pump. This substitution eliminates the turbulent mechanical motion that causes particle agglomeration in fluidized bed drying, while maintaining rapid drying speed through vacuum-induced evaporation, thus preserving original particle size distribution.
Solution Approach 2:
The patent changes the drying parameters by operating under vacuum conditions rather than atmospheric pressure. This parameter change (reduced pressure) lowers the boiling point of solvents, enabling rapid evaporation at lower temperatures without the mechanical agitation that causes agglomeration, thereby maintaining both drying speed and particle integrity.
3Quantity of substance
If conventional drying methods are used, then solvent is removed, but particle form and size distribution are not preserved
Solution Approach 1:
The patent utilizes controlled phase transition of solvent from liquid to vapor under vacuum conditions. This allows complete solvent removal while the gentle vacuum environment and low-temperature evaporation preserve the original particle form and size distribution, preventing the degradation that occurs in conventional high-temperature or high-agitation drying methods.
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
Enables rapid, efficient, and controlled drying of fluid-comprising materials while preserving particle form and size distribution, producing free-flowing particles with minimal abrasion or friability.
Implementation Method 1
the first screw conveyor housing has at least one housing wall, wherein this housing wall has at least one gas- and liquid-permeable but solid-impermeable wall section
Implementation Method 2
the vacuum housing is sealed off with respect to the first screw conveyor housing for the purpose of applying a vacuum
Implementation Method 3
The reduced pressure accelerates the evaporation of the solvent
Implementation Method 4
the conveying screw has screw flights, wherein the conveying screw extends into the first screw conveyor housing in such a way that the material is transported from the inlet port to the outlet opening
Data Source
AI summary
The present disclosure relates to a rotating-screw drying reactor for filtering and drying a fluid-containing material, and to a method for continuously filtering and drying a fluid-containing material by means of the rotating-screw drying reactor.