Fluororesin Decomposition Temperature Gradient for Monomer Selectivity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional chemical recycling methods for fluororesins lack selectivity in producing low-molecular-weight fluorine compounds due to inadequate control of temperature environments during decomposition.

Innovation Solution

Implementing a temperature difference (Δ1 and Δ2) between the microwave absorber and the carrier gas inlet and produced gas outlet, respectively, with specific temperature settings to enhance the selectivity of fluorine compounds produced.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional chemical recycling methods are used to decompose fluororesins, then decomposition can be achieved, but the selectivity of constituent monomers among low-molecular-weight fluorine compounds is poor

Engineering Contradiction:

Improveselectivity of constituent monomerVSAvoidyield of targeted compound

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The invention changes the temperature parameter by creating a controlled temperature difference between the microwave absorber (high temperature) and the produced gas (lower temperature). This temperature gradient transforms the decomposition process to enhance selectivity for constituent monomers while maintaining productivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention segments the temperature field into distinct zones: a high-temperature zone at the microwave absorber for efficient decomposition and a lower-temperature zone at the gas outlet for selective product formation. This spatial segmentation of temperature conditions resolves the contradiction between decomposition efficiency and product selectivity

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If temperature difference Δ2(TR-TE) is controlled to be 300°C or higher, then selectivity of constituent monomer is improved, but the complexity of temperature control increases

Engineering Contradiction:

Improveselectivity of constituent monomerVSAvoidtemperature control system

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The system uses microwave irradiation to self-generate the high-temperature zone at the microwave absorber, eliminating the need for external heating systems. The temperature difference is automatically maintained through the inherent heat generation and gas flow dynamics, reducing device complexity while achieving the required selectivity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention replaces complex mechanical temperature control systems with microwave irradiation-based thermal field generation. The electromagnetic energy directly creates the necessary temperature gradient without requiring sophisticated mechanical heating or cooling apparatus, thereby reducing system complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 constituent monomers in low-molecular-weight fluorine compounds by controlling the temperature difference between the microwave absorber and the produced gas, resulting in higher yields of targeted compounds.

Implementation Method 1

a decomposition step of heating a microwave absorber by irradiation with microwaves and bringing the heated microwave absorber into contact with a material containing a fluororesin to decompose the fluororesin

Methodology Applied

Scientific EffectMicrowave irradiation heating: Dielectric Heating

Implementation Method 2

bringing the heated microwave absorber into contact with a material containing a fluororesin to decompose the fluororesin

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

decompose the fluororesin into a low-molecular-weight fluorine compound

Methodology Applied

Scientific EffectThermal decomposition: Pyrolysis

Data Source

PatentUS20260049196A1Method for producing low-molecular-weight fluorine compound

Publication Date: 2026.02.19 DAIKIN INDUSTRIES LTD

AI summary

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.