Solid-Phase Polymeric Adsorbent for Lubricant Aromatic Removal
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Solution Overview
Problem
Current methods for removing soot and sludge from lubricants in internal combustion engines, such as using dispersants, are limited in effectiveness and can lead to increased viscosity and elastomer incompatibility issues, while existing filtration systems rely on physically or chemically active media that are not entirely effective in controlling soot and sludge build-up.
Innovation Solution
The use of a solid-phase polymeric material with a hyper cross-linked polymer structure, containing aromatic groups and a mean pore size of 0.1 to 100 nm, which is capable of sequestering aromatic compounds like polycyclic aromatic hydrocarbons (PAHs) from lubricants, thereby preventing soot and sludge build-up without increasing lubricant viscosity or causing elastomer incompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dispersants are added to engine lubricating oils to reduce soot and sludge, then soot and sludge are stabilized as smaller particles, but the viscosity of the engine lubricant increases greatly, particularly cold-temperature viscosity
Solution Approach 1:
The patent extracts and removes polycyclic aromatic hydrocarbons (PAHs) from the lubricant using an adsorbent material, eliminating the root cause of soot and sludge formation rather than merely stabilizing them. This extraction approach avoids the viscosity-increasing side effect of dispersants while directly addressing the contamination problem.
Solution Approach 2:
The patent changes the chemical composition parameter of the lubricant by selectively removing PAHs through adsorption. This parameter change (reduction of aromatic compounds) directly addresses soot formation while avoiding the unwanted viscosity increase associated with adding dispersants, thus resolving the contradiction between soot control and fuel efficiency.
2Reliability
If dispersants are added to engine lubricating oils to mitigate soot and sludge problems, then soot is stabilized as smaller dispersible particles, but elastomer materials in automotive engines are negatively interacted with
Solution Approach 1:
The patent removes PAHs using an adsorbent material, eliminating the harmful substances before they can interact with elastomer materials. This extraction approach prevents both soot formation and elastomer degradation simultaneously, avoiding the dual-problem scenario created by dispersants.
Solution Approach 2:
The adsorbent material acts as an intermediary that selectively binds to and removes PAHs from the lubricant, preventing direct harmful interactions between aromatic compounds and elastomer materials. This mediator approach protects both the lubricant quality and the elastomer components without the negative side effects of dispersants.
3Ease of operation
If physically active filter media or chemically active filter media are used to remove soot and sludge, then filtration is provided, but the systems are not entirely effective in controlling soot and sludge build-up
Solution Approach 1:
The patent employs an adsorbent material that changes the chemical composition of the lubricant by selectively adsorbing PAHs. This chemical parameter change approach is more effective than physical filtration alone, as it removes the molecular precursors of soot and sludge, thereby improving reliability while maintaining ease of operation.
4Reliability
If the amount of dispersant in a lubricant is increased to deal with higher levels of soot and sludge, then soot and sludge are better stabilized, but the unwanted effects of elastomer incompatibility and lubricant thickening are worsened
Solution Approach 1:
The patent extracts and removes PAHs from the lubricant using an adsorbent material, eliminating the need to add large amounts of dispersants. This extraction approach simplifies the lubricant composition by removing harmful substances rather than adding complex dispersant packages, thereby reducing composition complexity while improving soot and sludge control.
Solution Approach 2:
The patent uses a disposable adsorbent material that can be periodically added to the lubricant system to remove PAHs. This approach replaces the need for continuous high-level dispersant addition, simplifying the overall lubricant composition and reducing the complexity of managing high dispersant concentrations.
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
This approach effectively removes aromatic compounds from lubricants, reducing soot and sludge formation, thereby extending engine lifetime, improving fuel efficiency, and reducing the need for frequent maintenance by stabilizing soot as smaller particles and preventing agglomeration, while allowing for lower dispersant concentrations and easier re-refining of used lubricants.
Implementation Method 1
the solid-phase polymeric material comprising a hyper cross-linked polymer having a mean pore size of from 0.1 to 100 nm... capable of sequestering aromatic compounds like polycyclic aromatic hydrocarbons (PAHs) from lubricants
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A method for removing aromatic compounds from a hydrocarbon fluid comprises contacting the hydrocarbon fluid with a solid-phase polymeric material. The solid-phase polymeric material comprises a cross-linked polymer which contains aromatic groups. The method may be used to prevent the build-up of sludge and soot in a lubricant system in an internal combustion engine. A polymer bead comprising a solid-phase polymeric material is also provided.