Prussian Blue Derivative Ammonia Desorption Using Carbon Dioxide
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Solution Overview
Problem
Current methods for desorbing ammonia from Prussian blue derivatives are inefficient and costly, requiring aqueous solutions of salts or strong acids, and ultrapure water processes are not effective in achieving high desorption efficiency.
Innovation Solution
Contacting a Prussian blue derivative with carbon dioxide and water to efficiently release ammonia chemical species, utilizing the general formula AxM[M′(CN)6]y·zH2O, where x, y, and z are within specific ranges, and A, M, and M′ are defined cations, to facilitate desorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an aqueous solution of salt or strong acid is used for desorption, then ammonia desorption efficiency is improved, but process complexity and cost increase due to washing apparatus and waste water disposal
Solution Approach 1:
The patent extracts the harmful components (salt and strong acid) from the desorption process, replacing them with carbon dioxide and water. This eliminates the need for complex washing apparatus and waste water disposal systems while maintaining effective ammonia desorption, as the mild conditions do not require post-washing treatment.
Solution Approach 2:
The patent uses carbon dioxide and water as disposable, inexpensive desorption agents that can be easily disposed of or recycled without requiring complex treatment systems. This replaces the need for expensive and complex washing and waste water disposal infrastructure.
2Ease of operation
If ultrapure water is used for desorption, then process simplicity is improved, but ammonia desorption efficiency deteriorates
Solution Approach 1:
The patent introduces carbon dioxide as an intermediary substance that mediates between the simplicity of water-based processing and effective ammonia desorption. Carbon dioxide dissolves in water to form carbonic acid, which provides the necessary acidity for desorption while maintaining process simplicity and avoiding the need for strong acids.
3Productivity
If strong acid or salt solution is used for desorption, then ammonia desorption efficiency is improved, but operational safety and environmental friendliness deteriorate due to harsh conditions
Solution Approach 1:
The patent changes the parameters of the desorption process by using carbon dioxide and water instead of strong acids or salt solutions. This maintains effective ammonia desorption through mild chemical conditions, improving operational safety and environmental friendliness while preserving productivity.
4Productivity
If traditional desorption methods are used, then ammonia desorption capability is improved, but cost effectiveness deteriorates due to expensive reagents and processing equipment
Solution Approach 1:
The patent employs carbon dioxide and water as cheap, readily available desorption agents that eliminate the need for expensive reagents and specialized equipment. This dramatically improves cost effectiveness while maintaining ammonia desorption capability.
Solution Approach 2:
The patent extracts the expensive components (strong acids, salt solutions, complex washing apparatus) from the desorption process, replacing them with inexpensive carbon dioxide and water, thereby improving cost effectiveness without sacrificing desorption capability.
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
This method allows for more efficient and cost-effective desorption of ammonia chemical species compared to traditional methods, with the ability to recycle the Prussian blue derivative for repeated adsorption and desorption cycles.
Implementation Method 1
a step of contacting a Prussian blue derivative having an ammonia chemical species adsorbed thereto with carbon dioxide and water for desorption of the ammonia chemical species
Implementation Method 2
adsorption of ammonia is an important technique in the industrial, agricultural, and environmental fields
Data Source
AI summary
An ammonia chemical species desorption process desorbs ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with using an aqueous solution of a salt or strong acid, and only water. This ammonia chemical species desorption process includes an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species.AxM[M′(CN)6]y·zH2O (1)where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M′ are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.