FAU and UZM-8 Composite Catalyst for Phenylalkane 2-Phenyl Content Control
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Solution Overview
Problem
Current solid catalytic processes for benzene alkylation with olefins face challenges in achieving desired 2-phenyl content in alkylbenzenes, leading to inefficiencies in energy use and selectivity, and require frequent catalyst regeneration, which affects the consistency of the product quality needed for surfactant production.
Innovation Solution
The use of a combination of acidic FAU molecular sieve and UZM-8 molecular sieve as catalytically active materials in the alkylation process, allowing for a low aromatic to mono-olefin mole ratio without excessive production of heavies, and maintaining consistent 2-phenyl content throughout the catalyst's lifetime, even during deactivation and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If higher benzene to olefin mole ratios are used to minimize heavy formation, then heavy production is reduced, but energy costs increase due to additional benzene recovery by distillation
Solution Approach 1:
The invention changes the chemical parameter of the catalyst system by using a specific mixed catalyst composition (fluorine-containing mordenite combined with solid alkylation catalyst) that alters the reaction selectivity. This allows the process to operate at lower benzene to olefin mole ratios while still minimizing heavy formation, thereby reducing the energy required for benzene recovery distillation.
Solution Approach 2:
The invention employs a composite catalyst system combining fluorine-containing mordenite with solid alkylation catalysts (aluminum chloride, fluorine-containing clay, or silica-alumina). This composite material provides synergistic effects that improve selectivity to mono-alkylbenzenes and reduce heavy byproducts, enabling energy-efficient operation without excessive heavy formation.
2Object-affected harmful factors
If solid catalysts are used to eliminate hydrogen fluoride, then safety and environmental issues are improved, but selectivity and energy efficiency need improvement
Solution Approach 1:
The invention uses a composite catalyst system combining fluorine-containing mordenite (which provides shape selectivity and eliminates HF) with solid alkylation catalysts (which provide high catalytic activity). This composite material achieves both safety benefits of solid catalysts and high selectivity for mono-alkylbenzene production, resolving the contradiction between safety and productivity.
Solution Approach 2:
The fluorine-containing mordenite component provides local shape-selective sites that favor mono-alkylation, while the solid alkylation catalyst provides highly active catalytic sites. Each component performs its specialized function locally, achieving overall high selectivity and productivity while maintaining safety.
3Reliability
If frequent catalyst regeneration is performed to maintain activity, then catalyst performance is maintained, but product quality consistency deteriorates
Solution Approach 1:
The composite catalyst system of fluorine-containing mordenite and solid alkylation catalyst provides enhanced stability and resistance to deactivation. The fluorine-containing mordenite component particularly contributes to maintaining consistent selectivity over time, reducing the frequency of regeneration needed and ensuring consistent 2-phenyl content in the alkylbenzene product.
Solution Approach 2:
The stable composite catalyst system provides a cushion against deactivation, maintaining consistent performance over extended periods. This beforehand cushioning effect reduces the impact of catalyst aging and minimizes quality variations that would occur with frequent regeneration cycles.
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 enhances the economic attractiveness of the process by reducing energy costs and maintaining consistent 2-phenyl content in phenylalkane products, improving their solubility and biodegradability, while minimizing the formation of heavies and ensuring consistent product quality for surfactant production.
Implementation Method 1
The processes of this invention are based upon the use of a combination of acidic FAU molecular sieve and UZM-8 molecular sieve as catalytically active materials
Implementation Method 2
a combination of acidic FAU molecular sieve and UZM-8 molecular sieve as catalytically active materials
Data Source
AI summary
The alkylation of aromatic compound with acyclic mono-olefin is effected under alkylation conditions including the presence of solid catalyst to provide a phenylalkane product having a consistent, desired 2-phenyl content. At least a portion of the aromatic compound and mono-olefin is contacted with a catalyst comprising FAU molecular sieve and at least a portion of the aromatic compound and mono-olefin is contacted with a catalyst comprising UZM-8 catalyst.