Enzyme-Catalyzed Liquid Membrane for High CO2 Flux Separation
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Solution Overview
Problem
Current CO2 separation technologies, such as pressure swing adsorption and traditional membrane methods, are inefficient and energy-intensive, with porous membranes suffering from poor selectivity and dense membranes experiencing low CO2 flux due to limited solubility and slow diffusion.
Innovation Solution
A selectively permeable membrane structure featuring a nanoporous layer with a hydrophilic and hydrophobic portion, utilizing a liquid transport medium with enzymes like carbonic anhydrase to catalyze CO2 dissolution and transport across the membrane, enhancing enzyme stability and reaction rates through nano-confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If porous membranes based on physical separations are used, then the membrane structure allows high flux, but the selectivity is relatively poor
Solution Approach 1:
The patent employs a porous support structure filled with liquid membrane material, combining the high flux advantage of porous membranes with the high selectivity of liquid membranes. The porous substrate provides structural integrity and transport pathways, while the liquid membrane phase within the pores delivers selective separation through solubility-diffusion mechanisms.
Solution Approach 2:
The invention creates a composite membrane system integrating a porous solid support with a liquid membrane phase containing carrier molecules. This composite structure merges the mechanical advantages of porous materials with the selective transport properties of liquid membranes, achieving both high flux and high selectivity simultaneously.
2Manufacturing precision
If dense CO2 membranes are used, then the membrane provides chemical separation based on solubility and diffusion, but the CO2 flux is very low
Solution Approach 1:
The patent introduces a liquid-phase transport medium that moves through the membrane via pressure-driven flow, enabling high flux transport. The liquid membrane system replaces slow solid-state diffusion with faster liquid-phase transport, while maintaining chemical separation selectivity through carrier-mediated transport mechanisms.
Solution Approach 2:
The invention changes the physical state of the membrane from solid (dense polymer) to liquid, fundamentally altering transport parameters. The liquid membrane phase enables faster diffusion coefficients and higher solubility for CO2, dramatically increasing flux while maintaining selectivity through chemical interaction with carrier molecules.
3Manufacturing precision
If pressure swing adsorption with MEA solvent is used, then CO2 separation is achieved, but large capital equipment investment and high energy consumption are required
Solution Approach 1:
The liquid membrane system uses pressure-driven flow to continuously circulate the membrane phase through the porous support, enabling self-sustaining transport without external regeneration systems. The carrier molecules automatically bind and transport CO2 across the membrane, eliminating the need for energy-intensive solvent regeneration required in PSA processes.
Solution Approach 2:
The invention extracts the liquid membrane phase from a bulk solvent system (as used in PSA) and confines it within porous membrane structures. This extraction transforms a bulk liquid absorption process requiring large equipment and regeneration into a compact membrane process with continuous flow and no regeneration needed.
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 achieves high CO2 selectivity and flux, allowing efficient CO2 separation over a broader temperature range, reducing energy consumption and equipment costs compared to conventional methods.
Implementation Method 1
dissolving the object species within a liquid transport medium
Implementation Method 2
the liquid transport medium includes a liquideous permeation medium and at least one catalyst within the liquideous permeation medium
Implementation Method 3
utilizing a liquid transport medium with enzymes like carbonic anhydrase to catalyze CO2 dissolution and transport across the membrane
Implementation Method 4
a nanoporous layer within the plurality of pores. The nanoporous layer may include a hydrophilic layer and a hydrophobic layer. The membrane structure may further include a liquid transport medium that resides within the hydrophilic layer
Data Source
AI summary
An ultra-thin, catalyzed liquid transport medium-based membrane structure fabricated with a porous supporting substrate may be used for separating an object species such as a carbon dioxide object species. Carbon dioxide flux through this membrane structures may be several orders of magnitude higher than traditional polymer membranes with a high selectivity to carbon dioxide. Other gases such as molecular oxygen, molecular hydrogen, and other species including non-gaseous species, for example ionic materials, may be separated using variations to the membrane discussed.