Lubricant Composition Acid Neutralization Ash Reduction
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Solution Overview
Problem
Existing lubricant compositions for internal combustion engines face challenges with ash formation due to excess overbased detergents, leading to engine damage, reduced fuel economy, and shorter engine life, especially when dealing with variations in fuel sulfur levels.
Innovation Solution
A lubricant composition that includes a specific amine and a detergent selected from metal sulfonates, phenates, salicylates, carboxylates, thiophosphonates, and their combinations, which effectively neutralizes acid without forming ash, thereby reducing the amount of detergent required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overbased detergent is used to neutralize acid from sulfur combustion, then acid neutralization is improved, but ash formation increases causing engine damage and reduced fuel economy
Solution Approach 1:
The patent changes the chemical composition parameters by using overbased detergent with specifically controlled metal content (0.01-5 wt% based on detergent weight) and combining it with amine additives. This parameter optimization allows adequate acid neutralization while minimizing ash-forming metal content, resolving the contradiction between neutralization effectiveness and ash reduction.
Solution Approach 2:
The patent creates a composite additive system combining overbased detergent with metal content and amine compounds. This composite approach leverages the high neutralization capacity of overbased detergent while the amine component provides additional neutralization with minimal ash formation, achieving both improved reliability and reduced harmful ash deposits.
2Object-generated harmful factors
If significant loadings of amine are used to replace detergent, then ash formation is reduced, but cost increases and regulatory concerns arise
Solution Approach 1:
The patent merges overbased detergent with controlled metal content and amine additives into a synergistic blend. The overbased detergent provides the bulk of acid neutralization capacity while requiring minimal amine (0.01-5 wt% of detergent weight), achieving low ash formation without the need for significant amine loadings, thus avoiding cost and regulatory issues.
Solution Approach 2:
The patent optimizes the concentration parameters by limiting amine content to 0.01-5 wt% of detergent weight and controlling metal content to 0.01-5 wt% of detergent weight. This precise parameter control achieves effective ash reduction while maintaining cost-effectiveness and regulatory compliance, avoiding the need for high amine loadings.
3Object-generated harmful factors
If overbased detergent is reduced to minimize ash, then ash formation is reduced, but acid neutralization capability decreases
Solution Approach 1:
The patent combines overbased detergent with amine additives in a synergistic formulation where the detergent provides the primary neutralization backbone and the amine component supplements neutralization capacity. This merging allows reduction of overall ash-forming potential while maintaining or enhancing total acid neutralization capability through the complementary action of both components.
Solution Approach 2:
The patent develops a composite additive system where overbased detergent (with controlled metal content) and amine compounds work together. The detergent provides high neutralization capacity per unit weight while the amine adds neutralization power with minimal ash contribution, creating a composite that achieves both reduced ash and maintained neutralization capability.
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 lubricant composition achieves significant acid neutralization with a minimal amount of amine and detergent, reducing ash formation and engine damage, while improving fuel economy and extending engine life.
Implementation Method 1
The amine may be basic and soluble in base oils and fuels, and chemically stable, yet does not produce ash when combusted (i.e., is ashless according to ASTM D 874 and as understood in the art). The amine neutralizes acid but does not form ash
Implementation Method 2
The lubricant composition is added to the fuel to lubricate various components of the engine (e.g. the cylinder and the piston)
Data Source
AI summary
A lubricant composition for a compression-ignition internal combustion engine includes an amine and a detergent selected from metal sulfonates, phenates, salicylates, carboxylates, thiophosphonates, and combinations thereof. The lubricant composition has a TBN of from about 10 to about 100 mg KOH/g when tested according to ASTM D2896. The amine contributes from about 0.1 to about 28% of the TBN of the lubricant composition. Further, a method of lubricating an internal combustion engine with the lubricant composition includes the steps of injecting a fuel and the lubricant composition into a cylinder to form a mixture, and combusting the mixture via compression-ignition.