Catalytic Reaction Process Water Level Control
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Solution Overview
Problem
In catalytic dehydrogenation reactions, such as paraffin dehydrogenation, the presence of water negatively impacts catalyst selectivity, leading to increased production costs due to undesirable by-products and feedstock loss, while completely removing water reduces catalyst activity.
Innovation Solution
A catalytic reaction system that adjusts the water level in the reactor gas phase to between 10 vppm and 3 mole percent, using a reactor and catalyst regenerator unit with water level sensors communicating with a control unit to maintain optimal water levels, enhancing catalyst reactivity and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water concentration is lowered to improve catalyst activity, then catalyst reactivity increases, but catalyst selectivity deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water concentration parameter within a specific range (10-3 mole percent) rather than simply minimizing it. This optimized parameter setting resolves the contradiction by finding the optimal balance point where catalyst activity is sufficiently high while selectivity is maintained, preventing the formation of undesirable by-products.
2Productivity
If water is completely removed from the reaction process, then catalyst activity increases, but production cost increases due to feedstock loss and product separation
Solution Approach 1:
The patent changes the water concentration parameter from complete removal to a controlled low level (10-3 mole percent). This parameter optimization maintains high catalyst activity while preventing excessive feedstock loss and reducing product separation costs, as evidenced by improved selectivity and reduced by-product formation.
3Manufacturing precision
If water concentration is reduced to improve selectivity, then by-product formation decreases, but catalyst reactivity is compromised
Solution Approach 1:
The patent optimizes the water concentration parameter to a specific range (10-3 mole percent) that simultaneously achieves high selectivity and maintains catalyst reactivity. This precise parameter control avoids the extremes of complete water removal, finding the optimal operating point where both selectivity and reactivity are maximized.
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 improves catalyst activity and selectivity, reducing production costs by minimizing undesirable by-products and optimizing product separation, while maintaining effective catalyst performance.
Implementation Method 1
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst. Catalysts generally react with one or more reactants in a reactor to form intermediate products that subsequently result in a final reaction product.
Implementation Method 2
Paraffin dehydrogenation (PDH) is a process in which light paraffins such as ethane, propane and butanes can be dehydrogenated to make ethylene, propylene and butenes, respectively
Implementation Method 3
a temperature of the catalyst regenerator unit is 550° C. to 900° C. such that a water level of the regenerated catalyst is about 100 wppm to about 8000 wppm
Data Source
AI summary
A system for contacting a reactant stream with a catalyst that includes a reactor containing a quantity of catalyst and an inlet and a product outlet configured for discharging product and a catalyst regenerator unit having an inlet configured for receiving a spent catalyst stream from the reactor and an outlet configured for passage of a regenerated catalyst to the reactor where a water level in the reactor is about 10 vppm to about 3 mole percent.