What are the standards for hydrogen dehydrogenation in the hydrogenation unit?

The standards are unclear. It is known that hydrogenation units with a hydrogen sulfide concentration in the recycled hydrogen of several thousand parts per million or higher basically have recycled hydrogen desulfurization systems.

In my opinion, the decision of whether to use circulating hydrogen desulfurization should be based primarily on the quality of diesel products and environmental requirements

The main reason for installing a desulfurization unit is that high-sulfur feedstocks cause high hydrogen sulfide levels in the circulating hydrogen of the hydrocracking or residue hydroprocessing unit’s reaction systems, which affects the purity of the circulating hydrogen and is detrimental to the reactions; therefore, hydrogen sulfide must be removed, but its level cannot drop below 300 ppm. Whether to install a desulfurization unit depends mainly on the sulfur content of the raw material.

For the hydrogen sulfide desulfurization system, first of all your plant needs to have a solvent regeneration unit to convert the rich amine solution back into a lean amine solution. Secondly, they are usually high-sulfur crude oils, such as Saudi oil; these days, many oils are high in both sulfur and nitrogen. Furthermore, for large-scale facilities, they generally need to be over 1 million tons in scale; relying on waste hydrogen emissions is simply not feasible. Let’s talk briefly about recycled hydrogen: the lower the nitrogen content in the feed oil, the better, although it generally isn’t extremely low. The sulfur content should also be as low as possible, but it cannot be zero; it’s absolutely impossible to have no sulfur at all. It is necessary to ensure an appropriate sulfur content in the raw materials. Among them, hydrogen sulfide can maintain the activity of the catalyst in its sulfided state and prevent sulfur loss. Too high a level of hydrogen sulfide is also not acceptable; high hydrogen sulfide levels reduce the hydrogen partial pressure and thus decrease the depth of the reaction. A small device that relies on the emission of waste hydrogen, while increasing the proportion of new hydrogen added to maintain the hydrogen partial pressure. For large-scale installations, I think the emission of waste hydrogen is a waste; moreover, it’s not possible to supply new hydrogen either – two new hydrogen generators would be needed to provide it. Am I right?～～Small devices can also be used for cyclic hydrogen desulfurization! Then there’s no need for waste hydrogen emissions.

I’ve said so much, but I still haven’t mentioned what I want! What I need is a standard, a basis for design. Thank you

The landlord won’t meet the standards! It depends on the local environmental regulations; they vary from place to place! Also, it’s necessary to consider the owner’s economic equilibrium value! There are no standards in terms of design! If a standard must be found, check the environmental impact assessment! Look at the total sulfur emissions; by doing the calculations you can determine whether it’s necessary to install such a system, because without sulfur removal, the material will have to be burned regularly in a flare!