Filter Substrate Surface Tuning for Hydrocarbon-Water Separation
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Solution Overview
Problem
Existing filtration methods for hydrocarbon fluids, such as diesel fuels, are inadequate in effectively removing free water that can cause engine damage through cavitation and corrosion, as they do not accurately predict the hydrocarbon-water separation ability based on surface properties in hydrocarbon fluids.
Innovation Solution
The method involves identifying substrates for hydrocarbon fluid-water separation filters by measuring the roll off angle and contact angle of water droplets on the substrate surface when immersed in hydrocarbon fluids like toluene, using UV treatment and hydrophilic group-containing polymers to enhance the substrate's ability to coalesce and remove water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtration methods are used for hydrocarbon fluids, then particle removal is achieved, but free water removal is inadequate
Solution Approach 1:
The invention changes the surface energy parameters of the filter substrate by treating it with hydrocarbon fluids, transforming it from a hydrophilic state to a hydrophobic state. This parameter change enables the substrate to repel water while allowing hydrocarbon passage, thereby improving water removal efficiency without sacrificing filtration productivity
Solution Approach 2:
The invention utilizes the phase behavior of water and hydrocarbons by creating a surface that exploits the immiscibility between these phases. The treated substrate surface creates conditions where water forms discrete droplets that can coalesce and be removed, while hydrocarbons pass through freely, thus resolving the contradiction between water removal and hydrocarbon processing
2Reliability
If the substrate is made hydrophobic to improve water separation, then water droplet adhesion decreases, but measurement and identification of suitable substrates becomes difficult
Solution Approach 1:
The invention uses toluene as a surrogate fluid to copy and simulate the effects of actual hydrocarbon fluids on the substrate surface. By measuring contact angles in toluene, which has similar properties to diesel and other hydrocarbons, the method provides an accurate prediction of substrate performance without requiring complex measurements in actual operating conditions
Solution Approach 2:
The invention introduces toluene as an intermediary substance that mediates between the substrate and the actual hydrocarbon fuel. The toluene contact angle measurement serves as an intermediate test that correlates with real-world performance, simplifying the identification process while maintaining accuracy
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 allows for more efficient water removal from hydrocarbon fluids by ensuring the substrate maintains a high contact angle and roll off angle, facilitating larger droplet coalescence and improved separation efficiency.
Implementation Method 1
the roll off angle of the water droplet on a hydrophobic surface of the substrate when the surface is immersed in toluene
Implementation Method 2
the substrate includes a UV-treated surface including, for example, a UV-oxygen treated surface
Implementation Method 3
the substrate includes a surface that has a hydrophilic group-containing polymer disposed thereon
Data Source
AI summary
A substrate for use in a filter media including, for example, in a hydrocarbon fluid-water separation filter; methods of identifying the substrate; methods of making the substrate; methods of using the substrate; and methods of improving the roll off angle of the substrate. In some embodiments, the substrate includes a hydrophilic group-containing polymer or a hydrophilic group-containing polymer coating.