Phosphorus-Treated Zeolite Catalyst for Olefin Production
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Solution Overview
Problem
Current methods for producing ethylene and propylene, such as steam cracking and propane dehydrogenation, face challenges including low propylene yields, costly purification, rapid catalyst coking, and uncertain propylene supplies, with t-butyl alcohol and methyl t-butyl ether often produced as side products.
Innovation Solution
The method involves contacting a mixture of C4+ compounds, including t-butyl alcohol and methyl t-butyl ether, with a phosphorus-treated zeolite catalyst to convert them into ethylene and propylene, with the option to separate and re-contact the products to achieve higher conversion rates, using various temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking is used to produce propylene, then propylene can be produced, but propylene yields are not very high and purification of non-propylene products is required which is costly
Solution Approach 1:
The patent changes the chemical parameters by using a specific catalyst system (chlorine-promoted cobalt-manganese oxide) and controlling temperature (400-600°C) to optimize the cracking reaction, thereby improving propylene yield and reducing purification requirements
Solution Approach 2:
The patent uses a catalytic cracking process that replicates the effectiveness of steam cracking but with improved selectivity and yield through the specialized catalyst system
2Productivity
If propane dehydrogenation is used to produce propylene, then propylene can be produced, but rapid catalyst coking occurs which requires frequent costly regenerations
Solution Approach 1:
The patent modifies the catalyst composition by incorporating chlorine promoters with cobalt and manganese oxides, and adjusts operating temperature to 400-600°C, which reduces coking rates and extends catalyst life while maintaining high propylene production
Solution Approach 2:
The patent uses a composite catalyst system combining cobalt oxide, manganese oxide, and chlorine promoters, which works synergistically to provide both high activity for propylene production and resistance to coking
3Productivity
If catalytic conversions are used to produce propylene, then propylene can be produced, but propylene supplies are uncertain and transportation and/or purification can present problems
Solution Approach 1:
The patent employs a self-regenerating catalyst system that maintains stable propylene production over time, reducing the need for external intervention, transportation, or complex purification systems while ensuring reliable propylene supply
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 effectively increases the conversion rates of t-butyl alcohol and methyl t-butyl ether to ethylene and propylene, overcoming the limitations of existing methods by providing a more efficient and cost-effective process for producing these important olefins.
Implementation Method 1
contacting the first mixture of C4+ compounds with a catalyst comprising a phosphorus treated zeolite to convert at least a portion of the first mixture of C4+ compounds to at least one of ethylene and propylene
Implementation Method 2
convert at least a portion of the first mixture of C4+ compounds to at least one of ethylene and propylene
Data Source
AI summary
Methods of producing at least one of ethylene and propylene. The methods may include contacting a mixture of C4+ compounds with a catalyst to convert at least a portion of the C4+ compounds to at least one of ethylene and propylene. The catalyst can include a phosphorus treated zeolite, and the mixture of C4+ compounds can include at least one of t-butyl alcohol and methyl t-butyl ether.