Demand for dimethyl disulfide in hydrogenation and cracking processes?
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Besides the pre-sulfurization of the catalyst, how is the amount of sulfur to be added during the reaction determined? Do all hydrogenation and cracking processes require sulfur supplementation?
I have not seen sulfurization in the hydrogenation and hydrocracking of petroleum products, but it is used in coal-to-oil processes
Under normal circumstances, sulfur supplementation is not required except for pre-vulcanization. In special situations, such as during large-scale circulation of the unit or when the desulfurization efficiency is low, sulfur needs to be added in certain amounts to prevent catalyst reduction
Generally, high-sulfur feedstocks do not require sulfur supplementation, and desulfurization units must be installed in the recycled hydrogen; hydrogen sulfide serves mainly to protect the activity of the catalysts. Raw materials are important; coal tar is generally sulfurized.
That’s what I think: the amount of hydrogen multiplied by the desired concentration gives the number of moles, and multiplying that by the molecular weight yields the mass flow rate; for cracking, it’s usually 500 ppm.
Hydrogenation shouldn’t be necessary; the sulfur content in the raw material is sufficient to cover the needs.
The sulfur content in the circulating hydrogen is low, and sulfur supplementation is required
Sulfur supplementation is required during the hydrogenation refining and cracking of coal tar, and the nitrogen content in coal tar is generally higher than its sulfur content