Hybrid Catalyst Pressure Control for Fischer-Tropsch Activity
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Solution Overview
Problem
Conventional hybrid catalysts used in converting carbon-containing feed streams to light hydrocarbons have a short lifetime, leading to costly and time-consuming regeneration cycles, as they quickly deactivate during the conversion process.
Innovation Solution
Increasing the pressure within the reaction zone containing a hybrid catalyst comprising a methanol synthesis component and a solid microporous acid material, such as Cu, Zn, Cr, and Al-based catalysts with molecular sieves, while maintaining a constant temperature, to enhance catalyst activity and extend its operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hybrid catalysts are used to convert carbon-containing feed streams to light hydrocarbons, then the conversion process can proceed, but the catalyst quickly deactivates leading to short operational lifetime
Solution Approach 1:
The patent applies parameter changes by increasing the pressure within the reaction zone during the conversion process. This pressure increase compensates for catalyst deactivation and maintains catalyst activity without requiring temperature increases, thereby extending catalyst operational lifetime while preserving productivity
2Productivity
If temperature is increased to compensate for catalyst activity loss, then catalyst activity can be maintained, but this approach was previously thought necessary and may have drawbacks
Solution Approach 1:
The patent changes the pressure parameter instead of temperature to compensate for catalyst deactivation. By increasing pressure within the reaction zone, the system maintains catalyst activity and productivity without requiring temperature increases, offering an alternative parameter adjustment strategy
3Duration of action of stationary object
If pressure is increased within the reaction zone, then catalyst activity is maintained and lifetime extended, but this requires pressure control mechanisms
Solution Approach 1:
The patent utilizes pressure as the controlling parameter to extend catalyst lifetime. While pressure control systems are required, this approach avoids temperature increases and provides a controlled method to maintain catalyst activity over extended periods
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 maintains the activity of the hybrid catalyst, ensuring a higher percentage yield of C2 to C5 hydrocarbons over a longer period without the need for simultaneous temperature increases, which were previously thought to be necessary for compensating activity loss.
Implementation Method 1
contacting the feed stream to a hybrid catalyst positioned in the reaction zone, wherein the hybrid catalyst comprises a methanol synthesis component and a solid microporous acid material
Implementation Method 2
increasing a pressure within the reaction zone during the contacting of the feed stream to the hybrid catalyst from the initial reactor pressure to a final reactor pressure
Data Source
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AI summary
A process for converting a feed stream to C2 to C5 hydrocarbons includes introducing a feed stream of hydrogen and at least one carbon-containing component selected from CO, CO2, and mixtures thereof into a reaction zone at an initial reactor pressure and an initial reactor temperature. The feed stream is contacted to a hybrid catalyst positioned in the reaction zone, and the hybrid catalyst includes a methanol synthesis component and a solid microporous acid material. The pressure within the reaction zone is increased during the contacting of the feed stream to the hybrid catalyst from the initial reactor pressure to a final reactor pressure. A temperature within the reaction zone at any time during the contacting of the feed stream to the hybrid catalyst is within ± 20° C of the initial reactor temperature.