Bisphenol A By-Product Isomerization with Sulfo-MOF Catalysts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catalysts for catalyzing the isomerization reaction of bisphenol A by-products in the bisphenol A reaction system exhibit poor catalytic selectivity and stability, leading to blockage of pore channels and deactivation due to coking, which affects the mass transfer diffusion of by-products and reduces product quality.
Innovation Solution
A novel isomerization treatment method using a sulfo-containing metal organic framework catalyst with adjustable sulfonic acid and sulfydryl quantities, which is designed to achieve high conversion rates and selectivity of bisphenol A by-products, thereby enhancing catalytic stability and preventing coking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acidic ion exchange resins are used as catalysts for isomerization reaction, then the isomerization reaction can be carried out, but the catalyst exhibits poor catalytic selectivity and low catalytic stability, and is prone to blockage of pore canals and deactivation due to coking
Solution Approach 1:
The patent employs a metal organic framework (MOF) catalyst with well-defined porous structures and adjustable pore sizes. The porous structure allows for optimized mass transfer diffusion of by-products while preventing coking and pore canal blockage that plague traditional ion exchange resins. The controlled porosity enables selective access of reactants to active sites while excluding larger molecules that would cause deactivation.
Solution Approach 2:
The patent uses composite metal organic framework materials combining metal nodes with organic ligands containing sulfonic acid groups. This composite structure integrates the advantages of both inorganic metal centers and organic functional groups, achieving high catalytic activity, selectivity, and stability. The composite nature prevents coking by distributing catalytic function across multiple components rather than relying solely on traditional acidic resin structures.
2Productivity
If traditional ion exchange resins are used, then the isomerization reaction proceeds, but the molecular sizes of by-products are large requiring larger reaction space, and the resin is limited by crosslinking degree and swelling, resulting in poor pore size modulation which is not conducive to mass transfer diffusion
Solution Approach 1:
The patent utilizes metal organic frameworks with tunable structural parameters including pore size, surface area, and functional group density. By adjusting the metal node coordination geometry and organic ligand length/substitution patterns, the pore size can be precisely modulated to match the dimensions of target by-products, optimizing mass transfer diffusion efficiency without the crosslinking constraints of traditional resins.
3Reliability
If sulfo groups and sulfydryl are used for catalytic isomerization activity, then the isomerization reaction occurs, but these groups are likely to run off from the resin, resulting in a decrease in catalytic performance as well as corrosion of equipment
Solution Approach 1:
The patent anchors sulfonic acid and sulfydryl functional groups within the robust metal organic framework structure through strong coordination bonds between metal nodes and organic ligands. This composite architecture prevents leaching of catalytic groups while maintaining their activity. The metal-ligand coordination provides stable anchoring that eliminates the runoff problems associated with traditional resin-bound functional groups.
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 method achieves a high conversion rate of bisphenol A by-products, ranging from 28% to 55%, and high selectivity of bisphenol A, ranging from 80% to 90%, thereby efficiently reducing by-products and improving product quality.
Implementation Method 1
a sulfo-containing metal organic framework catalyst with adjustable sulfonic acid and sulfydryl quantities, which is designed to achieve high conversion rates and selectivity of bisphenol A by-products
Data Source
AI summary
The present disclosure provides a process for reducing by-products in a bisphenol A reaction system. The process includes the following steps: conveying mother liquor produced after reaction, concentration, crystallization and separation of phenol and acetone to a mother liquor recovery system; subjecting the mother liquor obtained from the mother liquor recovery system and a sulfo-containing metal organic framework catalyst to contact for an isomerization reaction; and conveying a product obtained from the isomerization reaction to the mother liquor recovery system, to obtain bisphenol A after crystallization and dephenolization.