MOF Adsorption for Selective Caffeine Removal from Beverages
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Solution Overview
Problem
Existing methods for reducing purine alkaloids like caffeine in oral aqueous solutions, such as coffee and tea beverages, are inefficient and may affect other ingredients, necessitating a more effective and selective adsorption method.
Innovation Solution
Utilizing a metal-organic framework (MOF) with Zr4+, Cr3+, or Al3+ as metal ions and terephthalic acid as an organic ligand to adsorb and reduce purine alkaloids in beverages, specifically targeting caffeine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional adsorbents like activated carbon or zeolite are used to remove purine alkaloids, then the removal capability is provided, but the adsorption efficiency is insufficient and other ingredients may be affected
Solution Approach 1:
The patent employs metal-organic frameworks (MOFs) as porous adsorbent materials with precisely controlled pore sizes and structures. These MOFs provide high surface area and tailored porosity that enhances adsorption efficiency and selectivity for purine alkaloids while preserving other beverage ingredients, directly resolving the contradiction between removal capability and adsorption reliability
Solution Approach 2:
The invention uses composite metal-organic framework structures combining metal ions (Zr4+, Cr3+, Al3+) with organic ligands (terephthalic acid) to create materials with optimized adsorption properties. This composite approach enables simultaneous achievement of high purine alkaloid removal and maintained selectivity for other ingredients, overcoming the limitations of conventional single-material adsorbents
2Quantity of substance
If ion exchange resin or solvent extraction methods are used, then purine alkaloid removal is achieved, but the process complexity and potential impact on other ingredients increases
Solution Approach 1:
The patent applies selective extraction using MOF adsorbents that specifically target and remove purine alkaloids from the beverage matrix. This extraction approach simplifies the overall process compared to conventional methods by using a single selective adsorption step rather than complex multi-stage ion exchange or solvent extraction systems, thereby reducing device complexity while maintaining effective purine alkaloid removal
3Quantity of substance
If supercritical carbon dioxide extraction is used, then purine alkaloid removal is effective, but the equipment complexity and operational difficulty increases
Solution Approach 1:
The patent employs disposable or regenerable MOF adsorbent materials that can be easily handled and replaced. This approach eliminates the need for complex supercritical fluid equipment and high-pressure systems, making the process much easier to operate while maintaining effective purine alkaloid extraction through simple contact and filtration steps
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 MOF effectively reduces caffeine content in beverages to 2000 ppm or less, maintaining the quality of other components, and can be reused by desorbing and reusing the adsorbent.
Implementation Method 1
the metal-organic framework has high adsorption properties for gas... the metal-organic framework having a predetermined structure has an action of adsorbing caffeine
Data Source
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AI summary
The purpose of the present invention is to provide a method of producing an oral aqueous solution for drinking in which a purine alkaloid is effectively reduced. A metal-organic framework including Zr4+, Cr3+, or Al3+ as a metal ion and including a terephthalic acid ion as an organic ligand is brought into contact with an oral aqueous solution for drinking.