Ionic Liquid Additive for Nitrogen Dioxide Degradation Control

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Solution Overview

Problem

Hydrocarbonaceous liquids, particularly lubricants, face significant chemical degradation at elevated temperatures due to nitrogen dioxide contamination, which initiates nitration reactions leading to premature deterioration and acidic corrosion, despite conventional antioxidants focusing on oxygen-driven oxidation pathways.

Innovation Solution

A combination of a defined ionic liquid and detergent additive is introduced, comprising organic cations with pendant hydrocarbyl substituents and halogen-, sulfur-, and boron-free anions, along with hydrocarbyl-substituted neutral or overbased metal salts, to inhibit nitration reactions and control acidity build-up in hydrocarbonaceous liquids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional antioxidants are used to protect hydrocarbonaceous liquids, then oxygen-driven oxidation is inhibited, but nitrogen dioxide-initiated nitration degradation continues unchecked

Engineering Contradiction:

Improveprotection against oxidationVSAvoidnitrogen dioxide nitration degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a specific ionic liquid as an intermediary substance that mediates between nitrogen dioxide and the hydrocarbonaceous liquid. The ionic liquid contains heteroatom-containing functional groups that can interact with nitrogen dioxide, preventing it from directly attacking the hydrocarbon liquid and initiating nitration reactions. This intermediary mechanism selectively addresses nitrogen dioxide contamination without interfering with the conventional antioxidant's oxidation protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameters of the protective additive system by introducing ionic liquids with specific properties (halogen-free, sulfur-free, boron-free, containing heteroatom functional groups). These parameter changes enable the additive to specifically target and neutralize nitrogen dioxide through chemical interaction, while maintaining compatibility with the hydrocarbonaceous liquid and existing antioxidant system.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If hydrocarbonaceous liquids are formulated for elevated temperature service, then high temperature performance is achieved, but chemical degradation accelerates due to increased reactivity with nitrogen dioxide

Engineering Contradiction:

Improveelevated temperature service capabilityVSAvoidchemical stability against nitration

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary anti-action by incorporating the ionic liquid additive into the hydrocarbonaceous liquid before service begins. The ionic liquid is positioned in advance to intercept and neutralize nitrogen dioxide as soon as it enters the system, preventing the initiation of nitration reactions before they can start. This proactive protection is especially critical at elevated temperatures where reaction rates would otherwise accelerate.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent creates a composite protective system combining conventional antioxidants with a specifically designed ionic liquid. This composite additive composition provides dual functionality: the antioxidant handles oxygen-driven oxidation while the ionic liquid component addresses nitrogen dioxide-initiated nitration. The synergistic combination maintains chemical stability across multiple degradation pathways at elevated temperatures.

Inventive Principle:

Principle #40Composite materials

3Duration of action of moving object

If service life of hydrocarbonaceous liquids is extended, then economic value is improved, but nitrogen dioxide contamination causes premature deterioration

Engineering Contradiction:

Improveservice lifeVSAvoidresistance to premature deterioration

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent applies the taking out principle by removing the harmful nitrogen dioxide contaminant from the system through chemical interaction with the ionic liquid. The ionic liquid's heteroatom-containing functional groups bind with or neutralize nitrogen dioxide, effectively extracting it from the hydrocarbonaceous liquid system before it can initiate degradation reactions. This continuous removal mechanism prevents accumulation of nitration products that would lead to premature deterioration.

Inventive Principle:

Principle #2Taking out (Extraction)

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 additive composition effectively prolongs the service life of hydrocarbonaceous liquids by reducing nitration-induced degradation and acidity, outperforming conventional antioxidants and other ionic liquids by inhibiting nitrogen dioxide reactivity and maintaining viscosity and acidity control.

Implementation Method 1

the combination of ionic liquid and detergent serving to inhibit the nitration of the hydrocarbonaceous liquid by nitrogen dioxide

Methodology Applied

Scientific EffectNitration inhibition:

Implementation Method 2

inhibit the nitration of the hydrocarbonaceous liquid by nitrogen dioxide which initiates the degradation

Methodology Applied

Scientific EffectAcidity control:

Data Source

PatentUS12031103B2Method of limiting chemical degradation due to nitrogen dioxide contamination

Publication Date: 2024.07.09 INFINEUM USA

AI summary

An additive composition for limiting the chemical degradation of hydrocarbonaceous liquids due to nitrogen dioxide contamination at elevated temperature comprises the combination of an ionic liquid composed of a cation and a boron- and halogen-free, multi-functional anion and a detergent additive, the combination of ionic liquid and detergent serving to inhibit the nitration of hydrocarbonaceous liquid components that initiates degradation.