Stabilized Heat Transfer Fluid Compositions

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Solution Overview

Problem

Methyl perfluoroheptene ether, used in heat transfer applications, is susceptible to hydrolysis and acidic degradation at elevated temperatures, leading to reduced shelf-life and potential equipment damage, necessitating stabilization to maintain performance and safety.

Innovation Solution

Incorporating antioxidants and acid scavengers such as butylated hydroxy toluene, hydroquinone monomethyl ether, 2-tert-butyl-6-methylphenol, and 1,3-dioxolane into the methyl perfluoroheptene ether compositions to form stabilized working fluids that reduce acidic degradation and maintain thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If methyl perfluoroheptene ether is used as a heat transfer fluid, then thermal stability and safety are improved, but acidic degradation occurs at elevated temperatures leading to reduced shelf-life

Engineering Contradiction:

Improvethermal stabilityVSAvoidshelf-life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

Stabilizers are added to the heat transfer fluid composition before use to prevent acidic degradation. The stabilizers (such as carboxylic acids, phenols, or amines) are pre-introduced to neutralize or prevent the formation of acidic byproducts that would otherwise degrade the methyl perfluoroheptene ether at elevated temperatures, thereby extending shelf-life while maintaining thermal stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Stabilizer compounds act as intermediary substances between the methyl perfluoroheptene ether and the degradation process. These stabilizers (carboxylic acids, phenols, or amines) intervene in the chemical reactions that would otherwise produce acidic degradation products, neutralizing them or preventing their formation, thus protecting the main heat transfer fluid from degradation while maintaining system safety.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If methyl perfluoroheptene ether is used in heat transfer applications, then thermal performance is improved, but acidic byproduct formation causes equipment damage

Engineering Contradiction:

Improvethermal performanceVSAvoidequipment damage from acidic degradation

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

Stabilizer compounds serve as intermediary protective agents between the heat transfer fluid and equipment components. These stabilizers (carboxylic acids, phenols, or amines) preferentially react with or neutralize acidic byproducts formed during thermal operation, preventing direct contact between the acidic degradation products and equipment surfaces, thereby protecting against corrosion and damage while allowing high-temperature thermal performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stabilizers convert the harmful acidic degradation process into a beneficial protective mechanism. By allowing controlled stabilization reactions to occur, the system transforms what would be damaging acidic byproducts into harmless stabilized compounds, turning the potential harm of thermal degradation into a benefit where the stabilizers sacrifice themselves to protect both the heat transfer fluid and equipment.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

The stabilized compositions effectively mitigate acidic byproduct formation, extending shelf-life and preventing equipment damage, while maintaining thermal stability and safety, even at elevated temperatures.

Implementation Method 1

Methodology Applied

Scientific EffectAcid scavenging:

Data Source

PatentUS20230183538A1Stabilized Heat Transfer Fluid Compositions

Publication Date: 2023.06.15 THE CHEMOURS CO FC LLC

AI summary

The present application provides stabilized compositions (e.g., stabilized heat transfer fluids) comprising methyl perfluoroheptene for use, for example, in refrigeration and heat transfer applications. The stabilized compositions of the present invention are useful in methods for producing cooling and heating, methods for replacing refrigerants and refrigeration, air conditioning, heat pump apparatuses, and as solvents or dewatering agents.