Sulfur recovery hydrogenation catalyst
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I heard that there are insulation bricks inside the reactors used for sulfur recovery hydrogenation – what is their main composition? When replacing the catalyst, cool it to room temperature (to prevent passivation), open the manhole under nitrogen protection – will watering the catalyst have any impact on the equipment?
The sulfur recovery hydrogenation reactor has a heat-resistant lining, but it is not a heat-resistant rotor; rather, it is made of cast material. Its main component is alumina. When replacing the catalyst, it is not necessary to open the manhole under nitrogen protection, nor is watering required; simply wait until it has cooled to room temperature before opening the manhole.
Reply to 2# Clauspolunit: Doesn’t it react when it comes into contact with air? The catalyst should be cobalt-molybdenum in an oxidized state, while its activity should come from cobalt-molybdenum after sulfidation. What I mean is, is it okay to just pour it in without using air passivation?
Reply to 3# Shouhou: During the shutdown of the sulfur recovery hydrogenation catalyst, if it is necessary to open the manholes for inspection or to remove the catalyst, it is essential to passivate the catalyst, that is, to convert its active sulfide form into an inactive oxide form; otherwise, the manholes cannot be opened.
Reply to 4# Clauspolunit: What I mean is whether it’s possible to avoid passivation, as time is quite tight. After all, the catalysts used in methanol synthesis have never experienced deactivation, let alone those used for sulfur recovery I want to open the manhole and add water under nitrogen protection. Does the heat-resistant lining have an impact?
If time is tight, you can remove the exhaust gases now to deactivate the hydrogenation catalyst in advance. It is definitely dangerous to remove the agent without passivation. Furthermore, adding water to the reactor as you mentioned will definitely damage the lining.
What the original poster said is not feasible, because when metal oxides are sulfided, they react with air to produce a large amount of heat; adding water will damage the lining. If the catalyst is to be removed, it must be passivated first. Active participation