Pre-sulfiding temperature of hydrogenation catalyst
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During the pre-sulfiding stage of the hydrogenation catalyst, there are several temperatures that are not clear: during pre-sulfiding, it is required that hydrogen sulfide penetrate the catalyst bed at a constant temperature of 215°C. However, when the hydrogen sulfide content in the circulating hydrogen is either undetectable or less than 3%, the temperature of the catalyst bed inside the reactor does not exceed 230°C. Why is this? Then the temperature is raised to 230°C, and water and ammonia are introduced. What is the purpose of this? Why is it injected at this temperature? Then the temperature is raised to 250°C, and further to 300°C. What is the purpose of increasing the temperature step by step?
The bed temperature in the reactor is kept below 230°C because the catalyst in its oxidized state will be reduced to metallic monomers, thereby reducing the catalyst’s activity. “It is required that hydrogen sulfide penetrate the catalyst bed at a constant temperature of 215°C, and when the hydrogen sulfide content in the circulating hydrogen is not detectable or is less than 3%, I don’t understand what this 3% refers to; generally, the hydrogen sulfide content in circulating hydrogen should be controlled between 0.5% and 1%. As the temperature rises, the sulfur content on the catalyst gradually increases. Two factors need to be considered when selecting the final vulcanization temperature: 1. Ensuring the vulcanization rate ； 2. Ensure the sulfidation effect of each metal component.
Under normal production conditions, what are the conditions under which the catalyst is not reduced?
The hydrogen sulfide content in each section is 300PPM
The hydrogen sulfide content in each section is 300PPM
Are there no requirements regarding temperature? ? ? ? ? ? ? ? ?
Weren’t you born normally? That is the temperature at which normal production takes place
The catalyst will not be reduced to its metallic form only in the presence of hydrogen sulfide; therefore, it is necessary to ensure that hydrogen sulfide penetrates through the catalyst bed
The catalyst will not be reduced to its metallic form in the presence of hydrogen sulfide; therefore, it is necessary to ensure that hydrogen sulfide can penetrate through the catalyst bed. Injecting ammonia at 230 degrees is intended to prevent excessive intensity during high-temperature sulfidation, as the ammonia injection suppresses the reaction.
As long as hydrogen sulfide reaches a certain concentration, will no temperature be able to reduce the catalyst? Or is there a critical temperature? If so, what is this temperature?
This post was last edited by Night Demon Attack on 2015-9-24 at 10:06. During the sulfidation process, the hydrogen sulfide concentration should be maintained between 0.5% and 1.0%; the temperature should not exceed 230°C before penetration occurs. Generally, when the hydrogen sulfide concentration is not high enough, the temperature should not exceed 200°C. After penetration, the temperature should be kept at 280°C, as too high a temperature can damage the catalyst