Organic Framework Porous Solid Acid Catalyst for Esterification
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Solution Overview
Problem
Traditional inorganic solid acid materials face limitations due to hydrophilic framework structures, pore size limitations, and poor stability, which restrict their application in catalytic reactions and ion exchange processes.
Innovation Solution
A synthetic method involving the use of polydivinylbenzene as a material for sulfonation to create an organic framework porous solid acid with high crosslinking degree, large specific surface area, and stable porous structures, utilizing a process that includes hydrothermal treatment, swelling in 1,1′,2-trichloroethane, and sulfonation with concentrated sulfuric acid, followed by activation to enhance catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional inorganic solid acid materials are used, then acid catalytic activity is achieved, but hydrophilic framework structure limits application scope
Solution Approach 1:
The patent changes the fundamental parameter of framework composition from inorganic to organic, creating an organic framework solid acid material that exhibits hydrophobic properties unlike traditional inorganic materials. This parameter change resolves the contradiction by providing both the required acid catalytic activity and improved adaptability for various organic reactions while maintaining framework stability.
Solution Approach 2:
The patent creates a composite material system combining organic framework structure with sulfonic acid functional groups. This composite approach integrates the hydrophobic nature of organic frameworks with the strong acidic properties of sulfonic groups, achieving both broad application scope and structural stability simultaneously.
2Adaptability or versatility
If zeolite molecular sieve is used, then acid catalysis is achieved, but pore size limitation restricts reactant access
Solution Approach 1:
The patent changes the pore size parameter from the fixed, limited pore structure of zeolites to a tunable organic framework structure with larger, adjustable pore dimensions. This allows better accessibility for various sized reactants while maintaining the structured framework necessary for catalytic activity.
3Quantity of substance
If strong acidic cation resin is used, then high acid site content is achieved, but low specific surface area reduces catalytic efficiency
Solution Approach 1:
The patent creates a composite material that combines the high acid site content characteristic of cation resins with the high specific surface area properties of porous organic frameworks. The resulting material exhibits both sufficient acid catalytic activity and large surface area for efficient reactant contact.
Solution Approach 2:
The patent utilizes a porous organic framework structure that provides both high specific surface area and adequate pore volume to accommodate acid sites. This porous architecture resolves the contradiction by offering extensive surface area for catalysis while maintaining sufficient acid site density through appropriate functional group incorporation.
4Productivity
If traditional inorganic solid acid is used, then catalytic activity is achieved, but poor framework stability limits reuse
Solution Approach 1:
The patent changes the framework composition parameter from inorganic to organic, creating a material with superior chemical and thermal stability compared to traditional inorganic solid acids. This organic framework provides enhanced reliability for repeated use while maintaining high catalytic activity through sulfonic acid 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 resulting material exhibits high catalytic activity, stability, and regeneration ability in esterification and acylation reactions, with reduced activity loss after recycling, and maintains a high sulfonate content and specific surface area, overcoming the limitations of traditional solid acid materials.
Implementation Method 1
30 milliliter 1,1′,2-trichloroethane is mixed homogenously with 70 mL concentrated sulphuric acid having a mass concentration of 98%, with silver sulfate being added as a catalyst, the mixture is then stirred uniformly followed by adding processed polydivinylbenzene (PDVB) obtained from (3) with severe agitation, and the temperature of sulfonation is increased to 90° C. for 12 h
Implementation Method 2
2.0 g polydivinylbenzene (PDVB) blocks are added into 1,1′,2-trichloroethane, then PDVB material rapidly swells, explodes and cracks into small blocks accompanied by rapid volume expansion of PDVB
Implementation Method 3
30 milliliter 1,1′,2-trichloroethane is mixed homogenously with 70 mL concentrated sulphuric acid having a mass concentration of 98%, with silver sulfate being added as a catalyst
Data Source
AI summary
The invention relates to a catalyst for the catalytic esterification and acylation reaction. The catalyst is prepared by the steps of adding a divinyl benzene monomer into a solvent prepared by mixing azobisisobutyronitrile, tetrahydrofuran and water, performing hydrothermal treatment at the normal temperature under the constant pressure, and volatilizing the solvent at the room temperature to obtain polydivinylbenzene; grinding the polydivinylbenzene into 200-mesh powder and performing degassing treatment under the nitrogen condition; adding polydivinylbenzene blocks into 1,1′,2-trichloroethane to explode and crack into small blocks, wherein the small blocks swell; evenly mixing 1,1′,2-trichloroethane and concentrated sulfuric acid, adding silver sulfate serving as a catalyst, adding processed polydivinylbenzene, performing sulfonation, filtering and washing with dioxane and water till it is neutral, performing drying, using dilute sulphuric acid to activate, performing washing till the it is neutral and performing drying. The catalyst has high catalytic activity and conversion rate.