A series of issues regarding hydrogen sulfide in circulating hydrogen during the hydrogenation process
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Are there any requirements or specification ranges for the hydrogen sulfide content in the recycle hydrogen during the hydrogenation process? Are there any requirements regarding hydrogen content? Now, using gas-phase detection to monitor cyclohydrogen, it is impossible to distinguish between hydrogen and C1 and C2 gases. How can the hydrogen content in circulating hydrogen be detected separately? What is the effect of hydrogen sulfide concentration on the hydrogenation reaction?
There are certain requirements regarding the hydrogen sulfide content in the recycled hydrogen during the hydrogenation process, and these requirements vary depending on the hydrogenation method used. There are requirements regarding the hydrogen content in recycled hydrogen, and hydrocracking has the highest demands on the purity of hydrogen. The amount of hydrogen sulfide affects the removal efficiency of hydrogen sulfide from the product.
It can be measured using gas chromatography with a TCD detector, an alumina chromatography column, and argon as the carrier gas
There are specific requirements regarding hydrogen sulfide in the recycled hydrogen during the hydrogenation process. Generally, hydrogenation catalysts require a hydrogen sulfide concentration of at least 300 ppm; when this concentration exceeds 0.5%, a system for removing hydrogen sulfide from the recycled hydrogen becomes necessary. The presence of hydrogen sulfide helps to maintain the activity of the hydrogenation catalyst, but beyond a certain concentration, it no longer contributes to maintaining that activity. Additionally, hydrogen sulfide affects the chemical equilibrium of the hydrodesulfurization reaction, and high concentrations of hydrogen sulfide can result in excessive sulfur content in the products. For precious metal catalysts, since hydrogen sulfide is in a non-sulfided form, its concentration is required to be no more than 50 ppm (this value is usually provided by the catalyst manufacturer).
Reply to 1# Xida Chemical: It depends on what your product is. Different products and different process conditions have varying requirements regarding hydrogen sulfide. Additionally, the usage time of the catalyst also plays a role; the demands of the catalyst with regard to hydrogen sulfide must be met. Generally, if there is an excess of hydrogen sulfide, it indicates that the raw materials contain a high amount of sulfur, or that the desulfurization and denitrification processes were very thorough