Fischer-Tropsch Catalyst High Hydrogen Treatment
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Solution Overview
Problem
The Fischer-Tropsch catalysts experience a loss of catalytic activity and selectivity over time, leading to significant costs for catalyst replacement and process shutdowns in industrial processes.
Innovation Solution
A process involving high hydrogen level treatment of Fischer-Tropsch catalysts, either through high hydrogen syngas with a ratio of at least 3:1 or pure hydrogen, is applied within the reactor, reducing methane selectivity and improving catalyst performance by maintaining sustained long-term activity without the need for full plant shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Fischer-Tropsch catalysts are used continuously in industrial processes, then production continues without interruption, but catalytic activity and selectivity are lost over time
Solution Approach 1:
The patent applies preliminary action by performing a high-hydrogen treatment on the catalyst before significant deactivation occurs. The treatment involves contacting the catalyst with hydrogen or syngas having a hydrogen-to-carbon monoxide ratio of at least 3:1 (preferably at least 5:1) under reaction conditions to reduce carbonaceous deposits and restore catalytic activity proactively, preventing the need for full shutdown and catalyst replacement.
Solution Approach 2:
The patent implements periodic action by scheduling high-hydrogen treatment cycles during catalyst operation. The treatment is applied periodically to restore catalytic activity without requiring complete shutdown, allowing the catalyst to be regenerated in-situ during the reaction process, thus maintaining continuous production while restoring reliability.
2Reliability
If catalyst replacement is performed to restore activity, then catalytic performance is renewed, but process shutdown and production loss occur
Solution Approach 1:
The patent applies self-service by enabling the catalyst to treat itself through high-hydrogen exposure during normal operation. The catalyst undergoes in-situ regeneration where hydrogen or high-hydrogen syngas removes carbonaceous deposits and restores active sites without requiring removal from the reactor, allowing the catalyst to service itself and eliminate shutdown time for replacement.
Solution Approach 2:
The patent implements discarding and recovering by discarding carbonaceous deposits that deactivate the catalyst through high-hydrogen treatment, while recovering the catalytic activity in-situ. The treatment removes harmful carbon deposits that would otherwise require catalyst replacement, thereby recovering catalyst performance without the need for shutdown and physical catalyst handling.
3Reliability
If high hydrogen treatment is applied to improve catalyst performance, then catalyst stability is enhanced, but additional hydrogen consumption occurs
Solution Approach 1:
The patent applies parameter changes by adjusting the hydrogen-to-carbon monoxide ratio in the syngas feed to at least 3:1 (preferably at least 5:1) during treatment periods. This parameter change enables high-hydrogen treatment that restores and stabilizes catalyst activity by removing carbonaceous deposits, with the increased hydrogen consumption being a controlled trade-off for maintaining long-term catalyst stability and avoiding shutdown costs.
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
The high hydrogen treatment significantly reduces methane selectivity and enhances catalyst stability, providing performance improvements that extend for thousands of hours, with benefits observed even after repeated treatments, indicating a fundamental improvement rather than mere regeneration.
Implementation Method 1
contacting the catalyst with hydrogen or syngas at a temperature in the range of from about 200° C. to about 450° C., under a pressure in the range of from about 0 barg to about 50 barg, and a GHSV in the range of from about 500 hr−1 to about 5000 hr−1, for a period of time of at least 1 hour, preferably in the range of from about 1 hour to about 24 hours, to provide a reduced catalyst
Implementation Method 2
contacting the reduced catalyst of step (a) with syngas comprising H2:CO in a ratio in the range of from about 1:1 to about 2.1:1, in a Fischer-Tropsch synthesis reactor under a pressure in the range of from about 0 barg to about 50 barg, preferably in the range of from about 10 barg to about 42 barg, and a GHSV of over 1000 hr−1, at a temperature in the range of from about 100° C. to about 280° C.
Data Source
AI summary
The present invention relates to a process for treating a catalyst to improve performance, and more specifically to a process for treating a Fischer-Tropsch catalyst using a high hydrogen syngas to improve catalyst performance.