Steam Jet Atomization for Polycarbonate Drying
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Solution Overview
Problem
Conventional steam precipitation methods for producing polycarbonate resin powder result in a wet product with high water content, requiring multiple downstream dryers and being energy-intensive, which increases production costs and environmental impact.
Innovation Solution
The method involves introducing multiple smaller resin solution streams into the steam jet instead of a single inlet, improving atomization and energy efficiency, and utilizing additive manufacturing for jet assembly, allowing for complex designs that enhance flow dynamics and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional steam precipitation methods are used, then polycarbonate powder is produced, but the powder has high water content (25-60% by weight) requiring multiple downstream dryers and high energy consumption
Solution Approach 1:
The invention divides the single resin solution stream into multiple smaller streams that are introduced separately into the steam jet. This segmentation improves atomization of the resin solution, creating finer droplets that dry more efficiently during precipitation, thereby reducing water content in the final powder and decreasing the energy required for downstream drying operations
Solution Approach 2:
The invention changes the physical parameters of the resin solution delivery system by introducing multiple streams with different flow rates and distribution patterns into the steam jet. This parameter change optimizes the atomization process and heat transfer efficiency, resulting in powder with lower water content and reduced drying energy requirements
2Productivity
If multiple smaller resin solution streams are introduced into the steam jet, then atomization and energy efficiency are improved, but jet assembly design becomes more complex
Solution Approach 1:
The invention combines multiple resin solution delivery channels and steam delivery channels into a single integrated jet assembly structure. This merging of functions reduces the overall complexity compared to having separate delivery systems, while still achieving the benefits of multiple resin streams for improved atomization and energy efficiency
3Ease of manufacture
If conventional single inlet jet design is used, then jet assembly is simpler to manufacture, but atomization and particle size distribution are inferior
Solution Approach 1:
The invention segments the resin solution delivery into multiple channels within the jet assembly, creating multiple smaller streams that mix and atomize better in the steam jet. This segmentation produces superior particle size distribution in the final powder while the integrated design keeps manufacturing complexity manageable
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 reduces the water content of the polycarbonate powder, decreases energy usage, and potentially eliminates the need for additional dryers, resulting in a more efficient and cost-effective production process with improved particle size distribution.
Implementation Method 1
the steam atmosphere is at a sufficient temperature and pressure to cause methylene chloride to evaporate from the small droplets of polycarbonate solution, forming granular particles
Implementation Method 2
the steam itself simultaneously partially condenses on the particles, forming a wet powder. The wet powder typically has a water content of from about (or from) 25 to about (or to) 60 percent by weight
Data Source
Figure 1(a)
Figure 1(b)
Figure 1(c)
AI summary
A process for drying resinous materials, comprising: delivering, by way of a plurality of resin channels, resin fluid comprising polymer and solvent into at least first and second steam channels (101) having within a flow of steam, the first and second steam channels (101) each receiving resin fluid from a plurality of resin channels, the first and second steam channels each (101) being received by a stage 1 manifold (121), the steam and resin being delivered under conditions so as to separate at least some of the solvent from the resin fluid; and collecting at least some of the polymer from the resin fluid.