After the catalyst in the upper part of the hydrogenation reactor is skimmed, is pre-sulfurization and initial activity stabilization carried out?

It is mainly determined by the properties of your catalyst

Our device is also ready to start the process; it should be sulfurized. Otherwise, the catalyst will have very high activity, which affects the reaction

This year, the catalyst skimmer at the top of my hydrogenation reactor will be used for skimming; the amount of catalyst to be skimmed is 3.3 tons, while the amount used for protection is around 13 tons, with the remainder being ceramic balls； The total amount of catalyst is about 73 tons. After skimming, is pre-sulfurization and initial activity stabilization carried out? I hope everyone can discuss this together. Sulfidation is necessary because the catalysts and protectants used in your system account for about 23% of the total catalyst amount. Moreover, the new catalysts supplied are in an oxidized state and thus lack reactivity; only when they are in a sulfided state does their hydrogenation activity, selectivity, and thermal stability increase, allowing the catalyst to exhibit high hydrogenation efficiency. The activity of the previous catalyst can also be compensated for. There is no need to deliberately work on stabilizing the initial operation; it is sufficient to introduce low-nitrogen oil at the start of operation and let it circulate for a while.

Yuhao Petrochemical Special Engineering Department in Pingdingshan City specializes in the loading and unloading of catalysts

Generally, sulfiding a fresh catalyst is definitely necessary. If the cracking reactor does not have a tilt mechanism, initial activity stabilization is not necessary. However, even if some of the catalyst has been replaced, it is still advisable to take action; the initial temperature is difficult to control, and this can damage the catalyst. This is something that most catalyst suppliers will require.

The palladium-on-carbon catalyst used in PTA production is not needed

Since the catalyst you have installed is in an oxidized state and requires sulfidation, I believe running it with low-nitrogen oil for 24 hours will be sufficient to ensure stable initial activity

There are too many cases where vulcanization is necessary, but there’s no need to be too dogmatic about it.

Vulcanization is necessary; otherwise, the oxidized-state protectants will not be able to provide protection. The stability of initial activity depends on the amount of scum removed – more scum requires greater stability of initial activity, while less scum does not.