Fluororesin Decomposition Temperature Differentials for Monomer Selectivity
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Solution Overview
Problem
Conventional chemical recycling methods for fluororesins lack selectivity in producing low-molecular-weight fluorine compounds, as the temperature control of the produced gas discharged from the reaction vessel is not adequately managed.
Innovation Solution
Implementing a temperature difference (Δ1 and Δ2) in the fluororesin decomposition process, where Δ1(TR - TI) is set higher than 500°C and Δ2(TR - TE) is set 300°C or higher, by controlling the temperature of the produced gas discharged from the reaction vessel to be lower than the microwave absorber temperature, using microwave irradiation heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical recycling methods are used to decompose fluororesin, then the decomposition process can be performed, but the selectivity of constituent monomer among low-molecular-weight fluorine compounds is insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific temperature difference parameters (Δ1 > 500°C and/or Δ2 ≥ 300°C) to control the decomposition process. By changing the temperature parameters from conventional single-temperature control to differential temperature control, the selectivity of constituent monomer is improved while maintaining process feasibility through defined temperature ranges.
Solution Approach 2:
The patent implements dynamics by making the temperature control system adaptive and dynamic. The temperature of the produced gas is actively controlled to be lower than the microwave absorber temperature through feedback mechanisms, allowing the system to dynamically adjust temperature differences during the decomposition process to optimize monomer selectivity.
2Manufacturing precision
If temperature of produced gas is controlled to be lower than microwave absorber temperature, then selectivity of constituent monomer is improved, but additional temperature control mechanisms are required
Solution Approach 1:
The patent uses an intermediary approach by introducing a carrier gas that flows through the reaction vessel and absorbs heat from the decomposition zone. This carrier gas acts as a thermal mediator, transferring heat away from the produced gas to maintain the required temperature difference between the produced gas and the microwave absorber, thereby controlling selectivity without direct cooling of the produced gas.
3Productivity
If high temperature difference is applied to improve selectivity, then decomposition efficiency increases, but energy consumption increases
Solution Approach 1:
The patent extracts excess heat from the decomposition zone by using a carrier gas that flows through the reaction vessel and removes thermal energy. This extracted heat is then dissipated or recovered separately, allowing the main decomposition process to maintain high temperature differences for efficiency while the overall system manages energy consumption through controlled heat extraction and carrier gas flow rates.
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
Improves the selectivity of the constituent monomer of fluororesin among low-molecular-weight fluorine compounds produced, enhancing the efficiency of the decomposition process.
Implementation Method 1
heating a microwave absorber by irradiation with microwaves
Implementation Method 2
bring the heated microwave absorber into contact with a material containing a fluororesin to decompose the fluororesin
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The purpose is to improve the selectivity of a constituent monomer of a fluororesin among the low-molecular-weight fluorine compounds produced in a fluororesin decomposition method in which a temperature difference is provided so that the temperature of a product gas led out from a reaction vessel becomes lower than the temperature of a heated microwave absorber in the decomposition of the fluororesin. In a method for producing a low-molecular-weight fluorine compound by decomposing a fluororesin by bringing a heated microwave absorber into contact with a material containing a fluororesin in a reaction vessel provided with a carrier gas inlet and a decomposition gas outlet, (i) a temperature difference Delta 1(TR - TI), obtained by subtracting the carrier gas temperature TI (°C) from the temperature TR (°C) of the heated microwave absorber, is set to be more than 500°C and/or (ii) a temperature difference Delta 2(TR - TE), obtained by subtracting the product gas temperature TE (°C) at the outlet from the temperature TR (°C), is set to be 300°C or higher.