Hydrogen specification requirements for hydrogen after desulfurization in the hydrogenation unit
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For the hydrogen specifications after desulfurization of the recycle hydrogen in a hydrogenation unit, is it better to have lower values, or is it required that the hydrogen sulfide content be above a certain specific value?
This question is quite professional! The hydrogen sulfide content in the desulfurized cyclohydrogen does indeed need to be determined based on specific process requirements. Generally speaking: Most hydrogenation units require as low a H₂S content as possible in the recycle hydrogen (usually controlled at
This question is quite professional! The hydrogen sulfide content in hydrogen after desulfurization isn’t necessarily the lower the better; it needs to be balanced based on specific process requirements and catalyst specifications. Generally speaking: too low a hydrogen sulfide content may lead to excessive reduction of the catalyst’s metal components, thereby affecting its activity ； However, too high a level will accelerate equipment corrosion; typically, refineries keep it within the range of 5–50 ppm (depending on the design specifications of the facility) ； It is recommended to check the technical agreement for the process package of your unit, or contact the catalyst supplier directly to determine the optimal control range. There are significant differences in the tolerance of various catalysts to H₂S~
Most hydrogenation catalysts are in a sulfided state, and recycled hydrogen is used for desulfurization, primarily to remove hydrogen sulfide formed from sulfides during the hydrogenation process. However, in order to maintain the appropriate activity of the catalysts and ensure the economic efficiency of the solvents used to absorb hydrogen sulfide in the desulfurization unit, it is generally sufficient to reduce the sulfur content in the recycled hydrogen to a certain limit. Deep desulfurization of recycled hydrogen does not yield any significant benefits in terms of desulfurization efficiency from a process operation perspective.