Fluororesin Decomposition via Microwave Absorber Temperature Gradient
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Solution Overview
Problem
Existing methods for chemical recycling of fluororesins lack effective control over the temperature environment of low-molecular fluorine compounds, limiting the efficiency of fluororesin decomposition.
Innovation Solution
The method involves using microwave irradiation heating to decompose fluororesins, creating a temperature difference by setting the carrier gas inlet temperature lower than the microwave absorber temperature, thereby controlling the temperature environment of the produced gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used for fluororesin decomposition, then the decomposition reaction can proceed, but the temperature environment of the produced gas cannot be effectively controlled
Solution Approach 1:
The patent divides the temperature control into two separate zones: the reaction zone (heated to high temperature for decomposition) and the gas discharge zone (cooled for handleability). This segmentation allows independent optimization of each zone's temperature, resolving the contradiction between maintaining high decomposition efficiency and ensuring produced gas handleability.
Solution Approach 2:
The patent introduces a cooling medium as an intermediary substance that absorbs heat from the produced gas without directly contacting the decomposition reaction. This mediator enables temperature control of the produced gas while preserving the high-temperature decomposition environment, thus resolving the temperature control contradiction.
2Temperature
If the carrier gas inlet temperature is set lower than the microwave absorber temperature, then the produced gas temperature can be controlled, but the system complexity increases
Solution Approach 1:
The system uses the cold carrier gas inlet itself as the cooling source, eliminating the need for separate cooling equipment. The temperature difference between the cold inlet gas and hot microwave absorber automatically creates the desired temperature gradient, allowing the system to self-regulate produced gas temperature without additional complex control mechanisms.
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 allows for the controlled decomposition of fluororesins, resulting in a low-molecular fluorine compound with improved handleability due to the controlled temperature difference between the reaction system and the produced gas.
Implementation Method 1
heating a microwave absorber by irradiation with microwaves
Implementation Method 2
bringing the microwave absorber heated into contact with a material including a fluororesin to decompose the fluororesin into a low-molecular fluorine compound
Data Source
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AI summary
The purpose of the present invention is to provide such a temperature difference that the temperature of a produced gas discharged from a reaction vessel becomes lower than the temperature in a decomposition reaction system, i.e., the temperature of a heated microwave absorber, in the decomposition of a fluororesin. Provided is a method for producing a low-molecular fluorine compound, the method comprising a decomposition step for heating a microwave absorber by the irradiation with microwaves in a reaction vessel provided with a carrier gas inlet and a decomposed gas outlet and then bringing the heated microwave absorber into contact with particles of a material containing a fluororesin to decompose the fluororesin into the low-molecular fluorine compound, in which the carrier gas temperature TI (°C) at the inlet is set to a temperature lower than the temperature TR (°C) of the heated microwave absorber. According to this method, it becomes possible to provide such a temperature difference that the temperature of a produced gas discharged from the reaction vessel becomes lower than the temperature in the decomposition reaction system, i.e., the temperature of the heated microwave absorber.