Polystyrene Recycling via Vacuum Spray Separation
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Solution Overview
Problem
Waste expanded polystyrene poses economic and environmental challenges due to its low density, leading to inefficient transportation and excessive space usage in landfills, and existing recycling methods are economically wasteful.
Innovation Solution
A method and apparatus that involves dissolving polystyrene in an organic solvent, using a heat exchanger to heat the solution, and then spraying it to separate the polystyrene from the solvent under vacuum, allowing for efficient recycling and reuse of the solvent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If expanded polystyrene is transported by truck, then it can be moved from location to location, but the trucks bulk out and cannot reach load carry capacity due to low density
Solution Approach 1:
The patent changes the physical state of polystyrene from expanded foam to dissolved solution form, fundamentally altering its density parameter. By dissolving polystyrene in organic solvent, the material transitions from a low-density porous structure to a higher-density liquid solution, enabling efficient transportation without bulk-out problems.
Solution Approach 2:
The patent utilizes phase transition processes including dissolution of polystyrene in organic solvent, heating to separate components, and vacuum evaporation. These phase changes transform the material from solid foam through liquid solution to concentrated polymer form, resolving the density issue while enabling recycling.
2Quantity of substance
If waste expanded polystyrene is disposed of in landfills, then it is removed from circulation, but it takes up disproportionate amount of space
Solution Approach 1:
The patent fundamentally changes the density parameter of polystyrene through dissolution and concentration processes. By transforming expanded polystyrene into a dissolved solution and then concentrating it, the material occupies significantly less volume, eliminating the disproportionate space consumption in landfills.
Solution Approach 2:
The patent recovers and reuses the organic solvent through vacuum evaporation and condensation processes. This recovery mechanism allows the solvent to be reused in subsequent dissolution cycles, eliminating waste and reducing the need for continuous disposal while maintaining efficient space utilization.
3Productivity
If existing recycling methods are used, then polystyrene can be recovered, but the process is economically wasteful due to solvent loss
Solution Approach 1:
The patent implements a complete solvent recovery system using vacuum evaporation and condensation. The organic solvent is not discarded but rather recovered and reused in subsequent dissolution cycles, eliminating economic waste while maintaining high recycling efficiency through continuous operation.
Solution Approach 2:
The patent establishes a continuous recycling process where the organic solvent is repeatedly used to dissolve polystyrene waste, with no interruption or loss. The vacuum evaporation and condensation systems operate continuously to recover and reuse the solvent, maximizing productivity while eliminating substance loss.
4Manufacturing precision
If polystyrene is heated to separate from solvent, then separation occurs, but energy input is required
Solution Approach 1:
The patent utilizes phase transition of the solvent through vacuum evaporation and condensation. By applying vacuum pressure, the solvent evaporates at lower temperatures, reducing the energy input required for separation while maintaining high purity through controlled phase changes and subsequent condensation.
Solution Approach 2:
The patent employs vacuum conditions to create an inert environment that facilitates solvent removal at reduced temperatures. The vacuum atmosphere lowers the boiling point of the solvent, enabling separation with minimal energy input while achieving high separation purity through controlled evaporation and condensation.
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 enables efficient separation and recycling of polystyrene, reducing transportation costs and landfill space usage by converting polystyrene into a denser form, thereby improving recycling efficiency and reducing environmental impact.
Implementation Method 1
at least one heat exchanger (170) to heat the solution to a temperature in a range from about 235° F. to about 255° F.
Implementation Method 2
spraying it to separate the polystyrene from the solvent under vacuum
Implementation Method 3
spraying the heated solution to separate the polystyrene from the solvent
Implementation Method 4
separating the polystyrene from the solvent by applying heat to the solution to provide a heated solution and then spraying the heated solution to separate the polystyrene from the solvent
Data Source
AI summary
A method and apparatus for processing polystyrene. The method includes the steps of: receiving a solution in the form of polystyrene polymer dissolved in an organic solvent; and separating the polystyrene from the solvent by applying heat to the solution to provide a heated solution and then spraying the heated solution to separate the polystyrene from the solvent. The apparatus includes: a holding tank at least partly filled with a solution of polystyrene dissolved in an organic solvent; at least one heat exchanger (170); and a separator in the form of a sprayer unit.