What are the options for hydrogen desulfurization in cycles?

Solid desulfurizers are better, as they result in less pressure loss and lower energy consumption

Please send over the specific process parameters so I can take a look

The most commonly used method is methyl diethanolamine MDEA desulfurization.

In the previous cyclic hydrogen desulfurization tower, the hydrogen sulfide level could be reduced to below 500 PPM after desulfurization, achieving very good results.

The H2S content in the hydrogen used in the hydrogenation process is relatively high, exceeding 30,000. What are the options for desulfurizing this circulating hydrogen? I’d appreciate some advice from everyone. Answer: Currently, design institutes generally use the alcohol amine method (a chemical method) for the cyclic removal of hydrogen sulfide. To put it in more detail: A 25–30% N-methyldiethanolamine solution comes into countercurrent contact with recycled hydrogen; the amine solution that has absorbed hydrogen sulfide becomes an enriched solution. This enriched solution is then heated in a regeneration tower, where hydrogen sulfide and other acidic gases are released, converting it back into a depleted solution, which can be used again to absorb hydrogen sulfide. The efficiency of hydrogen sulfide removal depends on the quality of the desulfurizing agent (i.e., the N-methyldiethanolamine solution). Nowadays, composite desulfurizing agents are commonly used, enabling the removal of hydrogen sulfide from recycled hydrogen to levels of 20 ppm. If it is to be reduced to below 5 ppm, then a fixed-bed desulfurizer (zinc oxide) can be connected in series afterward; this process is well-established.

Our company is also considering using hydrogen cycling for desulfurization in hydrogenation units; could you tell us which design firms are experienced in this area?