Amine-Functionalized Dispersant for Oil Mist Separator Clogging
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Solution Overview
Problem
Oil mist separators in engines often become clogged with soot and sludge, leading to drainage channel failures in heavy-duty diesel engines, and existing solutions fail to effectively control soot concentrations and sludge buildup.
Innovation Solution
A lubricating oil composition containing an amine-functionalized olefin copolymer dispersant viscosity index improver, which includes a reaction product of an acylated olefin copolymer and a polyamine, along with a dispersant post-treated with aromatic or non-aromatic carboxylic acids, is used to reduce soot-induced viscosity increases and prevent filter plugging and sludge formation in oil mist separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating oil compositions are used, then the oil mist separator operates initially, but it becomes clogged with soot and sludge over time
Solution Approach 1:
The patent converts the harmful effect of soot and sludge accumulation into a beneficial dispersing action. The specially formulated dispersant package, including ashless dispersants and metal detergents, transforms the clogging problem by actively dispersing and suspending these contaminants in the oil, preventing them from settling and clogging the oil mist separator while maintaining reliable operation.
2Object-generated harmful factors
If existing additive compositions are used, then lubrication is provided, but soot concentrations and sludge buildup are not effectively controlled
Solution Approach 1:
The patent applies parameter changes by optimizing the concentrations and types of additives in the lubricating oil composition. It specifies precise ranges for ashless dispersants (0.1-10 wt%), metal detergents (0.1-10 wt%), and viscosity index improvers (0.1-5 wt%), creating a balanced additive package that effectively controls soot and sludge without excessive additive quantities that would increase cost and potential side effects.
3Reliability
If the oil mist separator is cleaned more frequently, then clogging is prevented, but maintenance time and operational downtime increase
Solution Approach 1:
The patent applies preliminary action by incorporating a proactive dispersant package in the lubricating oil composition that continuously prevents soot and sludge accumulation before it becomes a clogging problem. The ashless dispersants and metal detergents work throughout the oil change interval to keep contaminants suspended and preventable, eliminating the need for frequent cleanings and extending maintenance intervals while maintaining drainage channel cleanliness.
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 lubricating oil composition effectively reduces soot-induced viscosity increases and prevents filter plugging and sludge formation, ensuring the cleanliness and functionality of oil mist separators and extending engine maintenance intervals.
Implementation Method 1
The amine-functionalized olefin copolymer dispersant viscosity index improver includes a reaction product of an acylated olefin copolymer and a polyamine
Implementation Method 2
a dispersant comprising a reaction product of components (A) a hydrocarbyl-dicarboxylic acid or anhydride having a number average molecular weight of from about 500 to about 5000 and (B) at least one polyamine
Implementation Method 3
The OMS functions as a centrifuge to separate the oil from the air or gas, thus cleaning the air or gas. The disc stacks are rotated by a turbine on the bottom of the OMS that is driven by oil from the oil gallery. Oil droplets, soot, and aqueous acidic combustion condensate settle onto the upper surface of the lower cone due to the high centrifugal acceleration in each gap.
Data Source
AI summary
Lubricating oil compositions and methods of their use are provided herein. A lubricating oil composition as described herein includes a major amount of an oil of lubricating viscosity, an amine-functionalized olefin copolymer dispersant viscosity index improver in an amount of from about 1.5 wt. % to 2.0 wt. % based on the weight of the lubricating oil composition, and a dispersant. The amine-functionalized olefin copolymer dispersant viscosity index improver includes a reaction product of an acylated olefin copolymer and a polyamine. The dispersant includes reaction product of components (A) a hydrocarbyl-dicarboxylic acid or anhydride having a number average molecular weight of from about 500 to about 5000 and (B) at least one polyamine, wherein the reaction product is post-treated with (C) an aromatic carboxylic acid, an aromatic polycarboxylic acid, or an aromatic anhydride, wherein all carboxylic acid or anhydride groups are attached directly to an aromatic ring, and/or (D) a non-aromatic dicarboxylic acid or anhydride having a number average molecular weight of less than about 500.