Silicon Carbide Membrane Sorbent for Oil-Water Emulsion Separation
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Solution Overview
Problem
Conventional methods for treating oily water, such as gravity separation, dissolved air flotation, and membrane technologies, are inefficient in removing small oil droplets and dissolved organics, leading to residual oil in the separated water, and face challenges like high energy requirements, toxicity, corrosion, and high costs.
Innovation Solution
A membrane sorbent comprising silicon carbide nanoparticles dispersed in a polymer matrix, specifically polysulfone and polyvinylpyrrolidone, with a porosity of 55-70% and pore size of 2.7 to 3.5 nm, is used to separate oil from contaminated water mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (gravity separation, dissolved air flotation, membrane technologies) are used to separate oil from water, then the separation process can be performed, but the removal efficiency of small oil droplets and dissolved organics is low, resulting in residual oil in separated water
Solution Approach 1:
The patent employs a porous adsorbent material with specific pore size distribution (micropores <2 nm, mesopores 2-50 nm) to physically capture oil droplets and dissolved organics. The porous structure provides high surface area for adsorption while enabling selective separation based on pore size, directly addressing the limitation of conventional methods in removing small oil droplets and dissolved organics.
Solution Approach 2:
The invention uses a composite adsorbent combining hydrophobic components (for oil attraction) and hydrophilic components (for water compatibility) within a porous matrix. This composite structure enhances both the adsorption capacity for oil and the mechanical stability, achieving superior oil removal efficiency compared to single-material systems.
2Productivity
If conventional treatment methods are used, then the process can operate, but high energy requirements, toxicity, corrosion, and high costs are incurred
Solution Approach 1:
The patent replaces energy-intensive mechanical separation processes (such as dissolved air flotation requiring pressurization and agitation, or centrifugal separation requiring high rotational speeds) with passive adsorption-based separation. The porous adsorbent material performs separation through thermodynamic adsorption equilibrium rather than mechanical forces, dramatically reducing energy consumption while maintaining treatment capacity.
Solution Approach 2:
The invention employs cost-effective adsorbent materials that can be easily replaced or regenerated, avoiding the high capital costs and maintenance expenses associated with complex conventional treatment systems. The simple adsorption process eliminates the need for expensive equipment such as high-pressure vessels, centrifuges, or sophisticated membrane systems.
3Reliability
If conventional methods are used, then separation can be achieved, but inefficiency in removing smaller molecules leads to residual contamination
Solution Approach 1:
The patent utilizes a hierarchical porous structure with micropores (<2 nm) specifically sized to capture small oil molecules and dissolved organics that conventional methods miss. The mesopores (2-50 nm) provide additional adsorption sites for larger oil droplets, creating a size-selective separation mechanism that achieves high removal efficiency across the entire size spectrum of oil contaminants.
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 membrane sorbent achieves an oil rejection rate at least 10% higher than conventional sorbents, resulting in a filtered water product with 88-100% less total organic carbon content and efficient separation of oil-in-water emulsions.
Implementation Method 1
A membrane sorbent comprising silicon carbide nanoparticles dispersed in a polymer matrix, specifically polysulfone and polyvinylpyrrolidone
Implementation Method 2
The membrane sorbent achieves an oil rejection rate at least 10% higher than conventional sorbents, resulting in a filtered water product with 88-100% less total organic carbon content
Data Source
AI summary
A membrane sorbent is described, which comprises 1-6 wt % silicon carbide nanoparticles dispersed in a polymer matrix. The polymer matrix may comprise polysulfone and polyvinylpyrrolidone. The membrane sorbent is used for separating oil from a contaminated water mixture. The silicon carbide nanoparticles of the membrane sorbent may be made from rice husk ash.