Composite Zeolite Catalyst for Simultaneous BTX Conversion
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Solution Overview
Problem
Conventional methods for upgrading heavy reformate fractions into BTX compounds are inefficient due to the sequential nature of conversion reaction processes, where products from one reaction are used in another, limiting the overall efficiency.
Innovation Solution
A composite zeolite catalyst comprising desilicated mesoporous mordenite and ZSM-5 is used in a single reactor to simultaneously catalyze transalkylation and dealkylation reactions, converting heavy reformate streams into BTX compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential conversion reaction process is used to upgrade heavy reformate fractions, then dealkylation and transalkylation reactions can be performed, but the overall efficiency is limited due to the sequential nature where products from one reaction are utilized in another
Solution Approach 1:
The patent combines dealkylation and transalkylation reactions into a single reactor using a composite catalyst system. The first zeolite catalyst performs dealkylation while the second zeolite catalyst performs transalkylation simultaneously in the same reactor, eliminating the sequential process and improving overall conversion efficiency.
Solution Approach 2:
The composite catalyst system provides multi-functionality by incorporating two different zeolite catalysts in one reactor. The first zeolite catalyst is optimized for dealkylation while the second zeolite catalyst is optimized for transalkylation, allowing both functions to be performed simultaneously in a single unit.
2Reliability
If heavy reformate fraction is added directly to gasoline pool, then no further upgrading is needed, but environmental regulations require further upgrading
Solution Approach 1:
The patent merges dealkylation and transalkylation into a single reactor system, enabling heavy reformate fraction to be upgraded to meet environmental regulations while improving processing efficiency. The composite catalyst system ensures both reactions occur simultaneously, reducing production time and increasing throughput.
3Manufacturing precision
If conventional sequential process is used, then reaction conditions can be optimized for each step, but the overall process time and complexity increase
Solution Approach 1:
The patent combines two reaction steps into one simultaneous process using a composite catalyst system. Each zeolite catalyst is selected to optimize its specific reaction (dealkylation or transalkylation), maintaining reaction control while reducing overall process time by eliminating sequential operation.
Solution Approach 2:
The patent uses two different zeolite catalysts with distinct acid site characteristics and pore structures optimized for their respective reactions. The first zeolite catalyst has properties optimized for dealkylation while the second has properties optimized for transalkylation, allowing both reactions to proceed efficiently under the same operating conditions.
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 significantly enhances the efficiency and yield of BTX compounds, achieving high conversion rates and reducing the production of unwanted aromatic compounds, while maintaining catalyst life and productivity at lower temperatures.
Implementation Method 1
the composite zeolite catalyst is able to catalyze both the transalkylation reaction and the dealkylation reaction simultaneously
Data Source
AI summary
A method of making BTX (benzene, toluene, xylene) compounds by feeding a heavy reformate stream to a reactor, where the reactor includes a composite zeolite catalyst, that contains a mixture of a desilicated mesoporous mordenite and ZSM-5, and in which the desilicated mesoporous mordenite, the ZSM-5, or both, comprise one or more impregnated metals. The composite zeolite catalyst is able to catalyze the transalkylation reaction and the dealkylation reaction simultaneously to produce the BTX compounds.