Carbon Dioxide Separation Membrane Using Ionic Liquid Porous Layer
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Solution Overview
Problem
Existing carbon dioxide separation technologies for agricultural applications are cumbersome, difficult to operate smoothly, and lack efficient gas permeability, particularly when using ionic liquids, due to issues with size, handling, and thickness of the membranes.
Innovation Solution
A carbon dioxide separation membrane comprising a laminate structure with an ionic liquid affinitive porous layer and a non-affinitive porous layer, where the ionic liquid is retained within the affinitive layer, reducing the device size and improving handling and gas permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gel-like thin film with high liquid content is used to maintain ionic liquid, then gas permeability is improved, but the film thickness increases and handling becomes difficult
Solution Approach 1:
The patent uses a porous polymer foam body as the base structure, which provides three-dimensional void spaces that can hold ionic liquid while maintaining a thin overall film profile. The porous structure allows gas to permeate through the material while the capillary forces in the pores retain the ionic liquid, resolving the contradiction between gas permeability and film thickness.
Solution Approach 2:
The invention creates a composite structure by combining the porous polymer foam body with ionic liquid impregnated within its pores. This composite material integrates the structural support of the foam with the gas absorption characteristics of the ionic liquid, achieving both thin film thickness and high gas permeability simultaneously.
2Productivity
If ionic liquid is used in liquid state for gas absorption, then gas permeability is improved, but handling and assembly operation become complicated
Solution Approach 1:
The porous polymer foam body acts as a matrix that physically confines the ionic liquid within its three-dimensional pore structure. This prevents the liquid ionic liquid from leaking or spreading during handling, while still allowing it to maintain its liquid state for effective gas absorption and permeability.
Solution Approach 2:
The patent describes that the porous polymer foam body can be easily formed and the ionic liquid can be simply impregnated into the pores, creating a disposable or easily replaceable unit. This simplifies assembly and handling operations, as the entire assembly can be treated as a self-contained module.
3Productivity
If ionic liquid is impregnated into porous membrane to maintain liquid state, then gas permeability is improved, but device size increases
Solution Approach 1:
The three-dimensional porous structure of the polymer foam body allows for high surface area and volume utilization of the ionic liquid within a compact form factor. The foam structure provides extensive internal surface area for gas-ionic liquid interaction without increasing the external dimensions of the device significantly.
Solution Approach 2:
The patent transitions from traditional two-dimensional membrane structures to three-dimensional foam structures. This dimensional change allows the ionic liquid to be distributed throughout the volume of the foam, maximizing gas contact area while maintaining a compact overall device size.
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 allows for a compact, easily operable carbon dioxide concentrating device with enhanced gas permeability, effectively supplying carbon dioxide to plants while maintaining the ionic liquid in a stable liquid state without increasing viscosity.
Implementation Method 1
a method of concentrating and supplying carbon dioxide in the atmosphere with an adsorbent without using the gas cylinder or the fuel has been studied
Implementation Method 2
an ionic liquid affinitive porous layer (C) having an ionic liquid-containing liquid (A) retained within voids
Data Source
AI summary
A carbon dioxide separation membrane according to the present invention includes: an ionic liquid affinitive porous layer (C) having an ionic liquid-containing liquid (A) retained in voids; and an ionic liquid non-affinitive porous layer (B). The ionic liquid affinitive porous layer (C) may contain inorganic materials (for example, metal oxide particles having an average particle size of about 0.001 to 5 μm on a number basis). An average thickness of the ionic liquid affinitive porous layer (C) may be about from 0.01 to 10 μm. The ionic liquid affinitive porous layer (C) may include the ionic liquid-containing liquid (A) at a ratio from 0.1 to 99 parts by volume with respect to 100 parts by volume of voids. It may be a carbon dioxide separation membrane for fertilizing plants with carbon dioxide. The carbon dioxide separation membrane can reduce a size of the carbon dioxide concentrating device and enables smooth operation of the device.