CFC Replacement Solvent Mixtures for Precision Cleaning
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Solution Overview
Problem
Current CFC replacements do not fully meet the required performance properties, including cleaning effectiveness, volatility, compatibility, toxicity, environmental persistence, flammability, and cost, necessary for replacing CFC-113 in applications such as precision cleaning and refrigeration systems.
Innovation Solution
Development of solvent mixtures comprising hydrofluorochloro-ethers, hydrobromochlorofluoro-alkenes, hydrofluoro-ethers, and halogenated compounds with optimized solubility parameters, boiling points, and toxicity profiles, using quantitative structure property relations (QSPR) to create non-flammable, ozone-friendly, and cost-effective alternatives that match or exceed the performance of CFC-113.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CFC-113 is used as a solvent, then cleaning effectiveness and solvency for contaminants is superior, but ozone depletion occurs
Solution Approach 1:
The patent changes the chemical composition parameters by using hydrofluoroethers and hydrobromochlorofluoro-alkenes as alternative solvents. These replacement solvents have modified molecular structures that eliminate ozone-depleting chlorine atoms while maintaining solvency parameters through careful selection of fluorinated and brominated functional groups
Solution Approach 2:
The patent employs composite solvent formulations combining hydrofluoroether and hydrobromochlorofluoro-alkene components in specific ratios. This composite approach allows the mixture to achieve cleaning effectiveness comparable to CFC-113 while the individual components collectively eliminate ozone depletion through their non-CFC chemistry
2Object-affected harmful factors
If current CFC replacement solvents are used, then ozone depletion is reduced, but cleaning effectiveness and performance properties are insufficient
Solution Approach 1:
The patent optimizes physical and chemical parameters of replacement solvents by adjusting solubility parameters, boiling points, and molecular structures. The hydrofluoroether and hydrobromochlorofluoro-alkene components are selected and formulated to achieve solubility parameters matching CFC-113, ensuring equivalent cleaning performance for oils, greases, and fluxes
Solution Approach 2:
The patent creates replacement solvents that copy the desirable properties of CFC-113 including non-flammability, stability, and solvency characteristics. By replicating these key performance parameters through fluorinated and brominated chemistry, the invention achieves equivalent cleaning effectiveness without the harmful ozone-depleting properties
3Reliability
If replacement solvents with optimized properties are developed, then cleaning effectiveness improves, but formulation complexity increases
Solution Approach 1:
The patent extracts and isolates the essential cleaning function into two primary solvent components: hydrofluoroether and hydrobromochlorofluoro-alkene. By concentrating the active solvency properties in these two well-defined chemical classes, the formulation simplifies the complexity that would otherwise require multiple additives and co-solvents to achieve equivalent performance
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 solvent mixtures demonstrate improved cleaning effectiveness, reduced toxicity, and enhanced environmental compatibility, meeting the stringent requirements for CFC replacement, including compatibility with metals and elastomers, and extended solvency range for various contaminants.
Implementation Method 1
CFC-113 is widely used solvents for precision cleaning of parts and components due to their superior physical and chemical properties, especially their solvency for contaminating materials such as oils, greases, resin fluxes, particulates, and other contaminates
Data Source
AI summary
CFC replacement solvent compositions, methods of using the same and methods of making the same. These compositions meet or exceed the solvency, flammability, and compatibility requirements for CFC's while providing similar or improved environmental and toxicological properties. These solvent compositions have applications including, but not limited to, oxygen handling, refrigeration or heat pumps, electronics, implantable prosthetic devices, and optical equipment.