Hydroxyalkyl Succinimide Fuel Additives for Low-Temperature Stability
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Solution Overview
Problem
Existing fuel additives for gasoline engines are unstable at low temperatures, ineffective in reducing wear in fuel delivery systems, and do not provide significant fuel economy benefits, while additives in lubricants are not effective for fuel delivery systems and may cause intake valve deposits.
Innovation Solution
A fuel composition containing a reaction product derived from hydrocarbyl-substituted succinic anhydride, succinic ester, or succinic acid reacted with a polyamine and an epoxide compound, which is stable at low temperatures and devoid of primary and secondary amino groups, improving friction and wear properties and fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fatty acid amides are added to fuel to reduce friction and wear in fuel delivery systems, then wear protection is improved, but the additives become unstable at low storage temperatures and performance deteriorates
Solution Approach 1:
The patent modifies the chemical structure of succinimide additives by introducing hydroxyalkyl groups (2-hydroxypropyl, 2-hydroxybutyl, etc.) and controlling the degree of substitution. These structural parameter changes enhance low-temperature stability while preserving friction modification capabilities, allowing the additive to remain stable during storage yet effective during engine operation.
Solution Approach 2:
The invention creates composite molecular structures by combining succinimide core with hydroxyalkyl side chains. This composite approach integrates the wear protection functionality of succinimide with the low-temperature stability provided by the hydroxyalkyl groups, achieving both requirements simultaneously.
2Use of energy by moving object
If additives are added to lubricant to improve fuel economy, then fuel economy is improved, but the additives are not effective for fuel delivery system wear protection
Solution Approach 1:
The hydroxyalkyl substituted succinimide additive is designed to perform multiple functions simultaneously: it reduces friction in fuel delivery systems, protects engine components, and improves fuel economy. By incorporating this dual-functional additive into fuel, the patent eliminates the need for separate lubricant additives and achieves comprehensive protection across both fuel delivery and engine systems.
3Use of energy by moving object
If GMO is added to improve fuel economy when added to lubricant, then fuel economy is improved, but GMO is unstable in fuel additive packages and causes intake valve deposits
Solution Approach 1:
The patent extracts the beneficial friction modification and fuel economy improvement properties from GMO while eliminating its harmful instability and deposit-forming characteristics by replacing it with hydroxyalkyl substituted succinimide. This substitution removes the harmful factors while preserving the useful effects.
4Reliability
If conventional friction modifiers are used to reduce friction and wear, then wear protection is improved, but they do not provide significant fuel economy benefits and lack stability in fuel additive packages
Solution Approach 1:
The patent optimizes the molecular parameters of succinimide additives by controlling the hydroxyalkyl substitution degree (typically 20-80% of succinimide nitrogen atoms substituted) and the length of hydrocarbon chains. These parameter adjustments tune the additive to provide both wear protection and fuel economy improvement, with optimal fuel economy benefits observed at substitution levels of 30-60%.
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 fuel composition effectively reduces wear and improves fuel economy by maintaining stability at low temperatures and enhancing seal compatibility and demulsibility, providing better performance than conventional additives.
Implementation Method 1
friction modifiers, such as fatty acid amides are added to fuel to reduce friction and wear in the fuel delivery systems of an engine
Implementation Method 2
Partial esters of fatty acid and polyhydroxy alcohols such as glycerol monooleate (GMO) are known as friction modifiers for lubricant compositions
Data Source
AI summary
A fuel composition and method for reducing friction or wear and improving fuel economy in an engine. The fuel composition includes gasoline and from about 10 to about 750 ppm by weight based on a total weight of the fuel composition of a hydroxyalkyl hydrocarbyl-substituted succinimide compound having at least two hydroxyl groups attached to a tertiary nitrogen atom of a polyamino group through a hydrocarbyl link, wherein the hydroxyalkyl hydrocarbyl-substituted succinimide is devoid of primary and secondary amino groups.