Magnetic Field-Enhanced Membrane Gas Separation

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Solution Overview

Problem

Current gas separation processes are highly energy demanding due to thermodynamic limitations, with existing membrane technologies facing inefficiencies related to gas flow direction, pore orientation, membrane thickness, and uniform pore morphology, which hinder effective separation and scalability.

Innovation Solution

A gas separation apparatus and method utilizing a polyimide-based membrane surrounded by a magnet to apply an external magnetic field, enhancing selectivity and reducing energy consumption by directing gas flow through pores rather than gaps, and incorporating magnetic particles to tune membrane functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If traditional membrane separation is used, then gas mixtures can be separated, but energy consumption is high due to thermodynamic limitations

Engineering Contradiction:

Improveenergy consumptionVSAvoidseparation efficiency

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent applies magnetic field as an external parameter to modify the separation process. By introducing magnetic field strength and direction as controllable parameters, the system enhances gas separation selectivity without proportionally increasing energy consumption, thereby resolving the contradiction between energy loss and productivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces purely thermal/pressure-driven membrane separation with a magnetic field-enhanced separation mechanism. This substitution allows selective interaction with paramagnetic gases (like O2) to dominate the separation process, reducing reliance on high-pressure differential and thermal energy input

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If membrane thickness is increased to improve separation, then selectivity improves, but gas flow resistance increases and productivity decreases

Engineering Contradiction:

Improveseparation selectivityVSAvoidgas flow rate

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent introduces magnetic field as an intermediary mechanism that acts on paramagnetic gas molecules during their passage through the membrane. This intermediary force enhances selectivity by preferentially attracting or repelling specific gas components, allowing thinner membranes to achieve the same separation performance, thus maintaining high gas flow rates

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If uniform pore morphology is achieved, then separation consistency improves, but manufacturing complexity increases

Engineering Contradiction:

Improvepore uniformityVSAvoidmembrane fabrication complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent uses magnetic field parameters (strength, gradient, direction) as additional control variables to influence gas transport through pores of varying sizes and orientations. This compensates for manufacturing variations in pore morphology, maintaining consistent separation performance without requiring extremely precise fabrication control

Inventive Principle:

Principle #35Parameter changes

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 apparatus achieves improved selectivity and energy efficiency in separating gas mixtures like H2/CH4, He/CH4, H2/CO2, CO2/N2, He/CO2, CO2/CH4, and He/O2, with a 7-fold increase in CO2/CH4 selectivity and enhanced permeance, overcoming limitations in traditional membrane technologies.

Implementation Method 1

a magnet, whereby an external magnetic field can be or is applied to the membrane

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

The repulsive or attractive forces induced by magnetic field could act selectively on mixtures, such as oxygen, nitrogen, or carbon dioxide-containing gases, which exhibit high magnetic susceptibility

Methodology Applied

Scientific EffectMagnetic susceptibility: Magnetism