What is the definition of the desulfurization rate in hydrorefining?

It is generally defined as: (sulfur content in the raw material – sulfur content in the product) / sulfur content in the raw material. Last edited by myzfs on 2009-2-26 16:36.]

Desulfurization rate = (Sulfur content in the raw material – Sulfur content in the oil produced by the reaction) / Sulfur content in the raw material

Could you all go on and explain what the role of the desulfurization rate is?

The level of desulfurization efficiency reflects the performance of the hydrogenation catalyst. With **rising environmental standards, there are increasing demands for lower sulfur content in refined petroleum products. At the same time, as crude oil prices rise and oil fields continue to be developed, refineries increasingly need to process crude oil with high sulfur content. This requires catalysts with high desulfurization efficiency to remove sulfur from the refined products in order to meet production demands.

The refined desulfurization rate should refer to the catalyst’s desulfurization efficiency under normal operating conditions; it also indicates the level of catalyst activity. Desulfurization rate = (total sulfur in the feedstock – organic sulfur in the reaction products) / total sulfur in the feedstock

The desulfurization rate reflects the activity of the catalyst, as explained above. There is another indicator for assessing the performance of a catalyst, and that is relative activity. When the desulfurization rate is very high, for example above 99%, then relative activity becomes necessary. For example, with two catalysts, or considering the activity of catalysts at different operating stages, when the sulfur content in the product is reduced to very low levels, such as 50 ppm and 30 ppm, using high-sulfur raw materials with a sulfur content of 15,000 ppm results in desulfurization rates of 99.67% and 99.8% respectively. In terms of desulfurization efficiency, the two catalysts perform similarly; however, the performance requirements for the catalysts in such cases are extremely high. In terms of relative activity, assuming that the desulfurization level is reduced to 50 ppm and the catalyst activity is 100, then it can be calculated that when sulfur is reduced to 30 ppm, the catalyst’s relative activity will reach 109. The relative activity difference is nearly 10%, which clearly indicates that the catalyst requires higher activity, a factor that cannot be reflected by the desulfurization rate.