Regarding the issue of transforming pre-vulcanization catalysts
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Have you used transformed presulfiding catalysts? What was the effect? The presulfided catalyst used in our factory last time was already sulfided by the manufacturer; all that was needed during use was to raise the temperature. However, its performance was poor, and the catalyst’s efficiency declined rapidly. Upon inspection, it was found that the catalyst had broken down.
We’ve used it and it works very well. Whose is it that you’re using? (Send a WeChat message for a private chat!)
First, one should consider whether it is a problem with the process operation; secondly, check whether the catalyst is not strong enough
What kind of gasification process is it? Is the conversion furnace an adiabatic furnace or an isothermal furnace? Is it axial flow or radial flow? Which manufacturer makes the catalyst?
Pre-sulfiding catalysts from different manufacturers vary; some can be exposed to oxygen, and can be handled in an air-filled environment during packaging, transportation, and loading at room temperature, while others cannot be exposed to oxygen. In such cases, the effect of pre-sulfiding is much poorer.
You must be using nitrogen for protection during transportation and loading, or you’re dealing with those so-called \"pre-sulfiding catalysts\" that require additional process gases/hydrogen for further sulfidization; it’s the catalyst manufacturers who use such tactics to boost their sales figures and deceive clients. In reality, the operational life of such catalysts is reduced by at least 70%, and if it can maintain 70% of the standard strength of 130, that’s already considered quite good
Which pre-sulfiding catalyst is the original poster using? We used Qilu Keli’s pre-sulfiding catalyst a few days ago; we still don’t know how it performs. Did you also fill it under nitrogen conditions?
Disadvantages of nitrogen protection: 1. Transportation and loading are inconvenient; in particular, oxidation reactions may occur during loading, which can significantly affect the catalyst’s activity. 2. Catalysts under nitrogen protection are prone to sintering over time, leading to high pressure differences within the catalyst bed and significant sedimentation. 3. The service life of catalysts under nitrogen protection is relatively short
Indeed, the catalyst at the very bottom gets oxidized during loading, the bed temperature rises to over 40°C, and it’s also dangerous as people have to go down there to level it out
Which company’s catalyst is used for the transformation pre-vulcanization? What model? How long is the service life of a presulfided catalyst?
The presulfurized one has not been used. Ordinary sulfur-resistant catalysts have been used. The rapid decline in catalyst performance can be attributed to various factors. It’s best to do some tests. This helps to identify the main causes, facilitates communication with the manufacturers, and also helps to prevent similar situations from occurring again. It enhances the operators’ understanding of the process and avoids mistakes in operation.