Succinic Ester Dispersant for Soot Handling in EGR Engines
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Solution Overview
Problem
Heavy duty diesel engines with exhaust gas recirculation (EGR) experience increased lubricant viscosity due to soot, which current dispersant viscosity modifiers (DVMs) fail to effectively address, leading to suboptimal soot dispersion and viscosity increases.
Innovation Solution
A succinic ester-containing dispersant composition is developed, comprising a hydrocarbyl substituted succinic acylating agent, a polyol with hydroxyl functionality, and an aromatic amine, which reacts to form a dispersant that effectively handles soot in diesel engine lubricants, particularly in EGR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dispersant viscosity modifiers (DVMs) consisting of maleinated ethylene/propylene copolymer capped with aromatic amine are used, then soot dispersion is improved, but lubricant viscosity increases excessively at high soot levels
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersant by using succinated polybutene instead of maleinated ethylene/propylene copolymer, and combining it with specific aromatic amines (4-aminodiphenylamine, 3-nitroaniline, or 4-aminoacetanilide) to achieve better viscosity control while maintaining soot dispersion performance
Solution Approach 2:
The invention creates a composite dispersant system by combining succinated polybutene with aromatic amine components, forming a new material composition that achieves both effective soot dispersion and controlled viscosity increase, overcoming the limitations of single-component DVMs
2Object-affected harmful factors
If traditional DVMs are used in EGR engines, then soot handling is addressed, but viscosity increase exceeds acceptable limits (greater than 12 mm2/sec at 6 weight % soot loading)
Solution Approach 1:
The patent modifies the dispersant's chemical structure by using succinated polybutene backbone with specific aromatic amine end groups, changing the molecular properties to reduce viscosity increase while maintaining effective soot handling capability in EGR engine conditions
Solution Approach 2:
The invention replicates and optimizes the successful aromatic amine dispersant structure (originally developed by Nalesnik et al.) by combining it with succinated polybutene, creating a new generation dispersant that maintains the beneficial soot handling properties while improving viscosity control
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 succinic ester-containing dispersant composition significantly improves soot dispersion and viscosity management in heavy duty diesel engines, outperforming traditional DVMs by maintaining lubricant viscosity below 12 mm2/sec at 6 weight % soot loading in Mack T-11 EGR engine tests.
Implementation Method 1
dispersant composition significantly improves soot dispersion and viscosity management
Implementation Method 2
excellent soot dispersive characteristics
Data Source
AI summary
Reaction of a carboxylic acid-containing polymer with certain aromatic amines and polyols results in ester containing dispersant viscosity modifiers with improved soot handling performance in heavy-duty diesel engines, compared with non-ester containing dispersants.