Process for dehumidifying moist gas mixtures
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Solution Overview
Problem
Current absorption media for dehumidification, such as aqueous solutions of lithium bromide and ionic liquids, face issues like corrosion, poor absorption capability, and limited heat transfer in aluminum-based air conditioning systems, necessitating the development of non-corrosive and efficient absorption media for improved heat and mass transfer.
Innovation Solution
A process using a liquid absorption medium comprising a mixture of dialkylimidazolium-based compounds and specific salts, which reduces surface tension and contact angle with metal surfaces, enhancing wetting performance and heat transfer in aluminum-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous solutions of lithium bromide, lithium chloride or calcium chloride are used as liquid absorption media, then absorption capability is improved, but corrosion towards aluminium and other materials occurs necessitating expensive specific materials of construction
Solution Approach 1:
The patent changes the chemical composition parameters of the absorption medium by using ionic liquids instead of traditional aqueous salt solutions. This parameter change maintains high absorption capability while eliminating corrosion effects on aluminium and other materials, thus resolving the technical contradiction between absorption capability and corrosion resistance.
Solution Approach 2:
The patent employs composite ionic liquid systems combining different ionic liquid components to achieve both high absorption capability and chemical inertness towards construction materials. This composite approach allows the absorption medium to simultaneously provide effective water uptake and protection against corrosion of aluminium heat exchangers and other components.
2Object-affected harmful factors
If ionic liquids are used as absorption media, then corrosion resistance is improved, but heat transfer capability is reduced
Solution Approach 1:
The patent optimizes physical parameters of the ionic liquid system, particularly viscosity and thermal conductivity, by selecting specific ionic liquid components and their ratios. This parameter optimization maintains corrosion resistance while improving heat transfer capability to levels suitable for practical air conditioning applications.
Solution Approach 2:
The patent introduces aluminium-compatible ionic liquids as intermediary substances that bridge the gap between corrosion resistance and heat transfer requirements. These ionic liquids serve as mediators that provide both chemical inertness towards aluminium and adequate thermal properties for efficient heat exchange in the absorption cooling system.
3Ease of manufacture
If aluminium is used for construction of air conditioning systems, then ease of manufacture and cost are improved, but compatibility with traditional absorption media is poor due to corrosion
Solution Approach 1:
The patent changes the chemical parameters of the absorption medium to create ionic liquids that are chemically compatible with aluminium. This parameter change enables the use of aluminium construction materials without corrosion damage, thus achieving both ease of manufacture/cost benefits and material compatibility.
Solution Approach 2:
The patent converts the potential harm of ionic liquids interacting with aluminium into a beneficial relationship by developing ionic liquid formulations that are specifically designed to be compatible with aluminium surfaces. This transforms what could be a corrosive interaction into a beneficial, corrosion-free interface between the absorption medium and heat exchanger 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 proposed absorption media exhibit improved heat transfer and dehumidification efficiency by reducing surface tension and contact angle with aluminum, leading to increased dehumidifying capacity and reduced equipment complexity.
Implementation Method 1
a liquid absorption medium AVE comprising a mixture of at least one additive selected from the group consisting of compounds of the structure (I) with and at least one salt S selected from the group consisting of Q+ at least partially absorbs water from the moist gas mixture G
Implementation Method 2
A process using a liquid absorption medium comprising a mixture of dialkylimidazolium-based compounds and specific salts, which reduces surface tension and contact angle with metal surfaces, enhancing wetting performance and heat transfer in aluminum-based systems
Implementation Method 3
reduces surface tension and contact angle with metal surfaces, enhancing wetting performance and heat transfer
Implementation Method 4
at least partially removing water from the liquid absorption medium AVE1 to obtain a liquid absorption medium AVE2 having a relatively low water content compared to the liquid absorption medium AVE1
Data Source
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AI summary
The invention relates to a process for dehumidifying a moist gas mixture. The invention further relates to an apparatus for dehumidifying a moist gas mixture and to the use of said apparatus in the process according to the invention.The invention also relates to the absorption medium used in the process and the apparatus.