14-Membered Ring Metallosilicate Zeolite Transalkylation
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Solution Overview
Problem
Current transalkylation catalysts for producing ethylbenzene and cumene require elevated temperatures and large catalyst beds, making the process costly and inefficient, especially in converting trialkylated species without affecting dialkylated species selectivity.
Innovation Solution
The use of metallosilicate zeolites with 14-membered rings, such as UTD-1 and ITQ-27, as transalkylation catalysts operating at temperatures between 160° C. to 220° C. to convert dialkylated and trialkylated benzenes to monoalkylated species, maintaining high selectivity and conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallosilicate zeolites with 12-membered rings are used as transalkylation catalysts, then sufficient conversion of polyalkylated species can be achieved, but elevated temperatures and large catalyst beds are required, increasing process costs
Solution Approach 1:
The patent employs metallosilicate zeolites with 14-membered ring porous structures (such as ITQ-27 and UTD-1) that provide optimized pore dimensions and accessibility. These porous materials enable effective transalkylation at lower temperatures by improving the diffusion and reaction efficiency of polyalkylated species, thereby resolving the contradiction between achieving sufficient conversion and maintaining lower operating temperatures.
Solution Approach 2:
The invention changes the structural parameter of the catalyst by transitioning from 12-membered ring zeolites to 14-membered ring metallosilicate zeolites. This parameter change in the catalyst structure fundamentally alters the reaction kinetics and thermodynamics, enabling the process to operate at lower temperatures while maintaining or improving conversion efficiency.
2Productivity
If conventional transalkylation catalysts are used to convert trialkylated species, then conversion can be achieved, but the selectivity of dialkylated species conversion is adversely affected
Solution Approach 1:
The patent applies local quality by creating catalysts with specific 14-membered ring openings that provide localized active sites with optimized geometry. These localized sites are specifically configured to accommodate and convert trialkylated species effectively while maintaining appropriate selectivity for dialkylated species, thereby resolving the contradiction between conversion and selectivity.
Solution Approach 2:
The invention uses composite metallosilicate zeolite structures combining specific framework compositions with 14-membered ring topologies. These composite materials integrate multiple functional properties that enable simultaneous high conversion of trialkylated species and maintained selectivity for dialkylated species transformation.
3Productivity
If large catalyst beds are used to achieve sufficient conversion, then productivity is improved, but device complexity and process costs increase
Solution Approach 1:
The use of highly porous 14-membered ring metallosilicate zeolites with optimized surface area and pore volume allows for enhanced catalytic activity per unit volume. This increases the effective number of active sites available for reaction, thereby improving conversion efficiency without requiring proportionally larger catalyst beds, thus reducing device complexity.
4Productivity
If elevated temperatures are used to improve conversion rates, then productivity increases, but energy consumption and process costs increase
Solution Approach 1:
By changing the catalyst structure from 12-membered to 14-membered rings, the reaction activation energy is effectively reduced. This parameter change in catalyst structure allows the reaction to proceed at lower temperatures with comparable or improved rates, thereby reducing energy consumption while maintaining productivity.
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 approach allows for effective conversion of trialkylated species with improved selectivity and reduced process costs by operating at lower temperatures, enhancing the production of monoalkylated benzene while maintaining high conversion rates.
Implementation Method 1
contacting benzene with a mixture comprising dialkylated and trialkylated benzenes in the presence of a transalkylation catalyst composition under transalkylation conditions effective to convert at least part of the dialkylated and trialkylated benzene to monoalkylated benzene
Data Source
AI summary
A process for producing a monoalkylated benzene comprises contacting benzene with a mixture comprising dialkylated and trialkylated benzenes in the presence of a transalkylation catalyst composition under transalkylation conditions effective to convert at least part of the dialkylated and trialkylated benzene to monoalkylated benzene, wherein the catalyst composition comprises a metallosilicate zeolite comprising openings defined by 14-membered rings of tetrahedrally coordinated atoms and the transalkylation conditions include a temperature in the range of 160° C. to 220° C.