Silicone Waste Depolymerization Reactor with Internal Heated Structure
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Solution Overview
Problem
Current methods for recycling silicone wastes are inefficient due to limited heat transfer surface area, requiring solvents to manage viscosity and prevent foaming, which complicates single-step distillation and increases costs.
Innovation Solution
A method involving a reactor with a heated sidewall and agitator, along with an additional heated structure and a means to form a thin material coat on the heated surface, allowing for catalytic depolymerization without solvents, enhancing heat transfer and distillation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a batch vessel with heated sidewalls is used for catalytic depolymerization, then heat transfer to the silicone material is achieved, but the exposed surface area for oligomer distillation is minimal
Solution Approach 1:
The patent introduces an internal heated structure (such as a heated agitator or internal coil) within the batch vessel, adding a third dimension of heat transfer surface area. This internal structure provides additional exposed surface for oligomer distillation without increasing the footprint of the vessel, thereby resolving the contradiction between limited heated surface area and the need for higher distillation rates
Solution Approach 2:
The heating system is segmented into multiple independent heated zones: the vessel sidewalls and the internal heated structure. This segmentation allows each zone to contribute to both heating and distillation functions simultaneously, increasing the total effective surface area for oligomer recovery while maintaining efficient heat transfer to the bulk material
2Area of stationary object
If agitation is increased to propel material onto heated surfaces above the liquid line, then more surface area is exposed for distillation, but the process becomes less effective as product viscosity increases
Solution Approach 1:
The patent employs a heated internal structure that acts as an intermediary surface for oligomer distillation. This structure provides a dedicated heated surface that does not rely on agitation to expose material, as the internal structure is surrounded by the reaction mixture and provides continuous heat transfer and distillation surface area independent of agitation effectiveness
Solution Approach 2:
By adding the internal heated structure, the patent creates an additional dimension for heat transfer and distillation that is not dependent on the liquid surface exposed by agitation. This internal structure provides continuous distillation surface area throughout the reaction volume, bypassing the limitation of surface area availability
3Object-generated harmful factors
If a solvent is added to reduce viscosity and prevent foaming, then carry-over is reduced, but the solvent itself can distill or carry-over with the oligomer requiring subsequent separation
Solution Approach 1:
The patent removes the solvent from the system entirely by using controlled agitation and the internal heated structure to manage viscosity and prevent foaming through mechanical means alone. This extraction of the solvent component eliminates the need for subsequent solvent separation steps, reducing process complexity while still preventing carry-over
Solution Approach 2:
The system uses its own agitation mechanism and heated internal structure to control viscosity and prevent foaming without requiring external additives like solvents. The process serves itself by using the existing equipment functions to manage the harmful effects of viscosity increase
4Use of energy by moving object
If the heated surface below the liquid line is used, then heat transfer is achieved, but foaming and carry-over occur as oligomer elutes through viscous material
Solution Approach 1:
The heating function is segmented between the vessel sidewalls (for bulk heating) and the internal heated structure (for localized heating and distillation). This segmentation allows the internal structure to provide heat transfer efficiency while its position and design prevent the foaming issues associated with heated surfaces below the liquid line
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 increases recovery rates and processing efficiency, enabling single-pass operation from silicone materials to dryness, reducing catalyst usage and operational costs while preventing foaming.
Implementation Method 1
heating the polymer material in the vessel to a sufficient temperature to cause depolymerization of the polymer material into cyclic structures or oligomers
Implementation Method 2
employ unique agitation to effectively utilize and/or increase the surface area within the reactor
Implementation Method 3
elutes, under vacuum, the desired oligomer—a cyclic siloxane
Data Source
AI summary
A method of processing polymer materials, highly filled or otherwise to recover cyclic structures or monomers. The method involves providing a vessel having a heated side wall, an agitator, and at least one of an additional heated structure, other than the heated side wall, within the vessel and means for forming a thin coat of material processed in the vessel on said heated side wall. A polymer material is fed into the vessel and heated to a sufficient temperature to cause depolymerization of the polymer material into cyclic structures or monomers. The cyclic structures or monomers are removed from the vessel and collected. The method does not require the use of a solvent.