Membrane NO2 Separation for Low-Restriction Nitric Oxide Gas

The patent employs porous polymer membranes with specific pore structures to enable selective gas permeation. The membranes allow NO2 to pass through while blocking other gases, achieving effective NO2 removal without the flow restrictions associated with traditional soda lime scrubbers. The porous structure provides high surface area for gas interaction while maintaining low pressure drop.

The patent utilizes thin film membrane structures that provide efficient gas separation with minimal flow resistance. The thin film design allows gases to permeate through the membrane wall, achieving NO2 removal effectiveness comparable to or better than bulk scrubbing materials while significantly reducing flow restriction and pressure drop across the scrubber.

The patent implements a self-regenerating scrubbing system where the polymer membrane continuously captures NO2 from the gas stream. The membrane can be regenerated by heating or chemical treatment to release captured NO2, restoring the membrane's capacity without replacement. This creates a closed-loop system that maintains NO2 removal effectiveness indefinitely with periodic regeneration rather than replacement.

The patent changes the operational parameters of the scrubbing system by using temperature or chemical potential changes to reversibly bind and release NO2. The polymer membrane transitions between different binding states, allowing NO2 capture during normal operation and release during regeneration, thereby extending the functional life of the scrubbing medium far beyond conventional soda lime cartridges.

The patent replaces the mechanical/chemical absorption mechanism of soda lime with a physical permeation mechanism through polymer membranes. Instead of relying on chemical reactions that generate particulate byproducts, the system uses selective diffusion and solubility differences to separate NO2 from other gases, eliminating fine particulate generation while maintaining removal effectiveness.

The patent employs composite polymer membrane structures that combine different materials to achieve selective NO2 permeation. The composite structure may include hydrophobic and hydrophilic layers, or polymer matrices with embedded functional groups, designed to preferentially transport NO2 while preventing particulate formation and maintaining structural integrity without generating harmful byproducts.