Hydrogen production and hydrogenation reactor
Thread Content
This post was last edited by LYshihua on 2016-11-2 at 15:40. In our hydrogenation unit, the desulfurization reaction is supposed to be an exothermic reaction. However, in our reactor, the inlet temperature is high while the outlet temperature is low; it seems that there is almost no exothermic reaction such as desulfurization or olefin saturation. What I don’t understand is: isn’t there a risk that the catalyst in the hydrogenation reactor will be reduced under these conditions?
If your raw materials contain sulfur, it will not reduce the catalyst
The reactions with relatively large heat of reaction include olefin saturation, methanation, and the reaction between hydrogen and oxygen. The heat of reaction for desulfurization is not sufficient to offset the heat dissipation from the reactor; therefore, in the absence of these reactions, hydrodesulfurization results in a temperature drop, with the magnitude of this drop increasing as the load decreases. As for the reduction reaction you mentioned, it can occur in a hydrogenation reactor if certain conditions are met (high hydrogen concentration, no sulfur)
The reactions with relatively large heat of reaction include olefin saturation, methanation, and the reaction between hydrogen and oxygen. The heat of reaction for desulfurization is not sufficient to offset the heat dissipation from the reactor; therefore, in the absence of these reactions, hydrodesulfurization results in a temperature drop, with the magnitude of this drop increasing as the load decreases. As for the reduction reaction you mentioned, it can occur in a hydrogenation reactor if certain conditions are met (high hydrogen concentration, no sulfur)
Most reactors have several beds, and it seems difficult to make comparisons between these beds! To determine whether an exothermic reaction is favorable, one should look at the magnitude of the positive temperature rise in that bed layer; the larger this value, the more complete the hydrogenation reaction and the greater the amount of heat released
This post was last edited by dpclove21 on 2016-11-2 at 14:30. Since there is no sulfur or olefins in the raw materials, no reaction occurs and therefore no temperature rise takes place. Additionally, the desulfurization catalyst is zinc oxide; zinc has higher reactivity than hydrogen, so it is unlikely to be reduced
I made a mistake; what I asked was whether the hydrogenation catalyst would be reduced, not the desulfurization catalyst
I’m sorry everyone, what I meant was whether the catalyst in the hydrogenation reactor would be reduced
Are the properties of the raw materials too good?
But in terms of temperature rise, to be precise, there is no temperature rise at all, because the temperature has dropped. So I’m worried that the sulfur content in the raw materials might be extremely low, which is why I’m concerned about whether the catalyst could be reduced!
Don’t you test your raw materials at all? Is it something that is refined from something else?