Multilayer Sol-Gel Ceramic Membrane for High-Pressure CO2 Separation
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Solution Overview
Problem
Current polymeric membranes used for CO2 removal from natural gas face issues such as plasticization, fouling, physical aging, short service life, high energy consumption, and environmental impact, making them unsustainable for future natural gas production needs.
Innovation Solution
A multilayer sol-gel green ceramic membrane composed of ceramic materials (silica and alumina) with a designed porosity gradient, providing high chemical and mechanical stability, molecular sieving capability, and allowing backwashing, which operates effectively under high CO2 concentrations and pressures without plasticization or fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric membranes are used for CO2 removal from natural gas, then CO2 separation is achieved, but the membranes suffer from plasticization, fouling, and physical aging leading to short service life
Solution Approach 1:
The patent changes the material parameter from polymeric to ceramic (silica-alumina), fundamentally altering the chemical and physical properties to resist plasticization and fouling. The ceramic membrane maintains structural integrity under high CO2 concentrations and pressures, extending service life beyond 20 years while maintaining separation performance
Solution Approach 2:
The patent employs a composite ceramic structure with silica and alumina in specific ratios (60-80% silica, 20-40% alumina), creating a material that combines the advantages of both components: silica provides porosity and molecular sieving capability, while alumina enhances mechanical strength and chemical stability
2Productivity
If polymeric membranes are used for CO2 separation, then CO2 removal is effective, but high energy consumption is required for operation and maintenance
Solution Approach 1:
The patent utilizes a porous ceramic structure with controlled pore sizes (0.3-1.0 μm) that enables molecular sieving of CO2 from natural gas. The porosity allows efficient gas permeation driven by pressure differential alone, eliminating the need for high-energy processes while maintaining high CO2 removal efficiency
Solution Approach 2:
The patent replaces the complex polymeric membrane system requiring frequent maintenance and replacement with a robust ceramic membrane system that operates passively under pressure differential. The ceramic material's inherent stability eliminates energy-intensive regeneration processes required for polymeric membranes
3Productivity
If polymeric membranes are used for CO2 removal, then gas separation is achieved, but large platform space is required (70%)
Solution Approach 1:
The porous ceramic structure provides high surface area and permeability within a compact configuration, enabling effective CO2 separation in a smaller footprint compared to polymeric membrane systems. The optimized pore distribution maximizes separation efficiency while minimizing space requirements
4Productivity
If polymeric membranes are used for CO2 separation, then CO2 removal is effective, but non-recyclable waste is generated
Solution Approach 1:
The patent changes the material composition from polymeric to ceramic, fundamentally altering the environmental behavior. Ceramic membranes are inorganic, thermally stable, and chemically inert, making them non-biodegradable but also non-toxic and suitable for recycling or safe disposal, eliminating the harmful waste issues associated with degrading polymeric materials
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 ceramic membrane extends service life to over 20 years, reduces energy consumption and waste generation, and minimizes environmental impact by enabling compact processing units with lower energy demands and reduced carbon footprint.
Implementation Method 1
the gas separation principle of the green ceramic membranes (molecular sieve) allows the same to operate at higher pressures
Implementation Method 2
A multilayer sol-gel green ceramic membrane composed of ceramic materials (silica and alumina)
Data Source
AI summary
The present invention relates to a multilayer sol-gel green ceramic membrane for separating gaseous CO2 from the natural gas. Since it is composed solely of ceramic materials (silica and alumina), the developed ceramic membrane has as its main characteristics high chemical, physical and mechanical stabilities. These characteristics guarantee its applicability in the process of separating CO2 from the natural gas, even in streams with high concentrations of CO2 and under high pressures, and the developed membrane also allows the execution of backwash operations, when necessary. This results in significant energy savings, reduction of the greenhouse gas emissions and a decrease in the carbon footprint of the natural gas production chain.