Tandem Isomerization-Metathesis Catalyst for Isobutylene Conversion
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Solution Overview
Problem
There is a need for methods to convert isobutylene into economically valuable products, such as gasoline, as existing methods do not efficiently utilize isobutylene for such conversions.
Innovation Solution
The process involves tandem catalysis of skeletal isomerization and metathesis, where isobutylene is converted to a mixture of C4 olefins using a skeletal isomerization catalyst, and then the mixture is further processed with a metathesis catalyst to produce a product mixture that includes ethylene, propylene, and C5+ olefins, with C5+ olefins present in at least 25% by weight, suitable for blending into gasoline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If isobutylene is converted to C5+ compounds through conventional methods, then the production of economically valuable products is limited, but the patent achieves high C5+ olefin yield (at least 25% by weight) through tandem catalysis
Solution Approach 1:
The patent combines skeletal isomerization and metathesis reactions into a tandem catalytic process using a bifunctional catalyst system. The isomerization catalyst (zeolite with specific acidity) and metathesis catalyst (tungsten or molybdenum oxide) are integrated in a single reactor system, allowing sequential transformation of isobutylene to C4 olefins and then to C5+ compounds, achieving high productivity without requiring separate processing units
Solution Approach 2:
The patent optimizes reaction parameters including temperature (300-500°C), pressure (1-10 atm), and catalyst composition ratios to maximize C5+ olefin yield. By adjusting the acidity of the zeolite and the loading of metathesis metal oxide, the process achieves selective conversion with at least 25% C5+ olefin content in the product mixture
2Quantity of substance
If isobutylene is used as feedstock, then the availability of starting material is sufficient, but the conversion to economically valuable products such as gasoline is inefficient with existing methods
Solution Approach 1:
The patent performs preliminary skeletal isomerization of isobutylene to C4 olefins (1-butene, cis-2-butene, trans-2-butene) before the metathesis reaction. This preliminary transformation creates the necessary substrate configuration for efficient metathesis to C5+ compounds, ensuring complete utilization of isobutylene feedstock and minimizing unreacted material
Solution Approach 2:
The C4 olefin mixture serves as an intermediary species between isobutylene and C5+ compounds. The tandem catalyst system mediates the transformation through this intermediate stage, enabling efficient conversion pathways that avoid direct formation of low-value byproducts and maximize gasoline-range hydrocarbon production
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 method effectively converts isobutylene into a gasoline blend with a significant propylene byproduct, achieving a high yield of C5+ olefins, which can be further processed to produce gasoline, thereby addressing the need for economically valuable products.
Implementation Method 1
contacting isobutylene and a skeletal isomerization catalyst to convert the isobutylene to a mixture of C 4 olefins
Implementation Method 2
contacting the mixture of C 4 olefins with a metathesis catalyst to convert the mixture of C 4 olefins to a product mixture
Data Source
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AI summary
Methods of converting isobutylene to C5+ compounds. The methods may include contacting isobutylene with a skeletal isomerization catalyst to provide a mixture of C4 olefins, and then contacting the mixture of C4 olefins with a metathesis catalyst to convert the mixture of C4 olefins to a product mixture. The product mixture may include C5+ olefins.