Halogen-Based Removal of Metal Protective Layers
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Solution Overview
Problem
Existing methods for removing metal protective layers from reactor components in hydrocarbon conversion systems are inefficient, requiring shutdown and are not compatible with new process conditions, leading to downtime and potential incompatibility with sulfur-sensitive catalysts.
Innovation Solution
A method involving chemical and mechanical removal agents, such as halogen-containing compounds and abrasive blasting, to efficiently remove metal protective layers from reactor surfaces, allowing for the determination of remaining layer thickness and potential recoating with new layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to remove metal protective layers, then complete removal can be achieved, but reactor shutdown is required causing downtime
Solution Approach 1:
The invention changes the chemical parameters by introducing specific halogen-containing compounds (chlorine, bromine, iodine, or their compounds) that react with the metal protective layer at operating temperatures. This chemical transformation enables removal without shutdown by converting the protective layer into removable compounds that can be washed away, resolving the contradiction between complete removal and continuous operation
Solution Approach 2:
The halogen-containing compounds act as intermediary substances that mediate between the metal protective layer and the washing solution. The halogens first react with the metal layer to form intermediate compounds, which are then removed by washing, enabling gradual removal during operation without requiring complete shutdown
2Reliability
If existing removal methods are applied, then metal protective layer can be removed, but the method is not compatible with sulfur-sensitive catalysts
Solution Approach 1:
The invention applies local quality by using halogen-containing compounds that specifically target and react with the metal protective layer while leaving the sulfur-sensitive catalyst unaffected. The selective chemical reaction occurs only at the protective layer-catalyst interface, removing the layer without exposing the catalyst to damaging conditions, thus achieving both effective removal and catalyst compatibility
Solution Approach 2:
The halogen-containing compounds serve as disposable removal agents that are consumed in the reaction with the metal protective layer. These compounds are applied, react with the protective layer, and are then washed away, providing a temporary but effective removal mechanism that does not require permanent modification of the catalyst or system
3Productivity
If chemical removal agents are used, then removal efficiency increases, but determination of remaining layer thickness becomes necessary
Solution Approach 1:
The invention incorporates feedback by implementing a measurement step that determines the thickness of the remaining metal protective layer after chemical treatment. This feedback information allows operators to assess removal progress and adjust subsequent treatment parameters, enabling controlled incremental removal while maintaining high productivity through efficient chemical agents
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
Enables the efficient removal of greater than 50% of the metal protective layer, reducing downtime and allowing for the application of new layers compatible with changing process conditions, thereby enhancing reactor system performance and longevity.
Implementation Method 1
treating the metal protective layer with one or more chemical removal agents to remove at least a portion of the metal protective layer
Implementation Method 2
chemical and mechanical removal agents, such as halogen-containing compounds and abrasive blasting
Data Source
AI summary
A method of removing a metal protective layer from a surface of a reactor component comprising treating the metal protective layer with one or more chemical removal agents to remove at least a portion of the metal protective layer from the reactor component. A method of removing a metal protective layer from a surface of a reactor component comprising treating the metal protective layer to remove the metal protective layer from the reactor component, and determining a thickness of the reactor component following treatment.