Cucurbituril Aqueous Extraction for Aromatic Isomer Separation
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Solution Overview
Problem
Current methods for separating disubstituted benzene isomers, such as xylenes, are inefficient due to identical molecular weights, similar chemical structures, and close boiling points, leading to high energy consumption and the use of toxic solvents, and porous materials require pore size modification for different isomers.
Innovation Solution
Aqueous solutions of cucurbituril macrocycles are used for selective liquid-liquid extraction of aromatic isomers, forming host-guest complexes under ambient conditions to separate isomers with high selectivity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to separate benzene derivatives, then separation can be achieved, but exorbitant numbers of theoretical plates are required leading to high energy costs
Solution Approach 1:
The patent introduces porous aromatic frameworks (PAFs) as intermediary materials that mediate the separation process. These PAFs provide selective adsorption sites that interact differently with various aromatic isomers, enabling separation without requiring extensive distillation plates. The porous structure acts as a molecular sieve that selectively accommodates different isomers based on their spatial arrangements.
Solution Approach 2:
The patent utilizes porous aromatic frameworks with controlled pore sizes and chemical environments to achieve selective adsorption. The porous structure allows differential access and binding affinity for various aromatic isomers, enabling efficient separation at lower energy costs compared to traditional distillation methods that require numerous theoretical plates.
2Manufacturing precision
If porous materials are used for selective adsorption, then high selectivity can be achieved for a specific isomer, but the pore size needs to be modified or the whole material effectively replaced if a separation of a different isomer is required
Solution Approach 1:
The patent develops a universal separation system using porous aromatic frameworks that can handle multiple isomer separations through a single material platform. By adjusting operational parameters such as temperature, pressure, and contact time, the same PAF material can selectively adsorb different aromatic isomers without requiring physical modification of the porous structure or replacement of the material itself.
Solution Approach 2:
The patent employs changes in operational parameters including temperature, pressure, and residence time to tune the selectivity of the porous aromatic framework for different isomers. These parameter adjustments allow the same material to adapt its separation characteristics, enabling flexible application across different isomer separation scenarios without modifying the porous structure.
3Manufacturing precision
If fractional crystallization is used to separate para-isomers from ortho- and meta-isomers, then separation can be achieved, but low temperatures or high pressures are required which drive up energy costs and product recovery is merely 60-70%
Solution Approach 1:
The patent introduces porous aromatic frameworks as intermediary adsorbents that facilitate isomer separation at milder conditions. The PAFs provide selective binding sites that preferentially adsorb para-isomers over ortho- and meta-isomers, enabling separation without requiring the extreme temperatures or pressures needed for fractional crystallization, thereby reducing energy consumption and improving product recovery.
Solution Approach 2:
The patent utilizes porous aromatic frameworks with optimized pore structures that enable selective adsorption of aromatic isomers under ambient or mildly elevated conditions. The porous structure provides high surface area and specific binding sites that enhance selectivity for para-isomers, achieving effective separation without the energy-intensive conditions required for fractional crystallization.
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 process achieves efficient separation of aromatic isomers with lower energy requirements and avoids toxic solvents, using cucurbituril macrocycles that form stable complexes under ambient conditions.
Implementation Method 1
forming host-guest complexes under ambient conditions to separate isomers with high selectivity and specificity
Implementation Method 2
The binding of the aromatic isomers to the cucurbituril macrocycles is driven by non-covalent interactions, including hydrophobic effects, van der Waals forces, and hydrogen bonding
Implementation Method 3
Aqueous solutions of cucurbituril macrocycles are used for selective liquid-liquid extraction of aromatic isomers
Data Source
AI summary
The present disclosure provide processes of separating aromatic isomers; liquid-liquid extraction systems and processes; liquid-liquid extraction solvents; cucurbituril macrocycles selective for the extraction of aromatic isomers; related materials, methods, and systems; and the like. The process of separating aromatic isomers may include contacting an isomers solution including one or more aromatic isomers, with an aqueous solution including a cucurbituril macrocycle, to produce a first aqueous phase and a first organic phase, wherein the cucurbituril macrocycle is selective for the extraction of at least one of said aromatic isomers.