HDS catalyst /BNS/14/2015
HDS Catalyst.
Hydrodesulfurization (HDS) is a catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products, such as gasoline or petrol, jet fuel, kerosene, diesel fuel, and fuel oils.
The purpose of removing the sulfur is to reduce the sulfur dioxide (SO2) emissions that result from using those fuels in automotive vehicles, aircraft, railroad locomotives, ships, gas or oil burning power plants, residential and industrial furnaces, and other forms of fuel combustion.
Another important reason for removing sulfur from the naphtha streams within a petroleum refinery is that sulfur, even in extremely low concentrations, poisons the noble metal catalysts (platinum and rhenium) in the catalytic reforming units that are subsequently used to upgrade the octane rating of the naphtha streams.
Hydrogenation of the sulfur compounds results in the formation of undesirable, toxic gaseous hydrogen sulfide. The industrial hydrodesulfurization processes include facilities for the capture and removal of the hydrogen sulfide gas. In petroleum refineries, the hydrogen sulfide gas is then subsequently converted into byproduct elemental sulfur. In fact, the vast majority of the 68,000,000 metric tons of sulfur produced worldwide in 2010 was byproduct sulfur from petroleum refining and natural gas processing plants.
The process chemistry
Hydrogenation is a class of chemical reactions that results in the addition of hydrogen. Hydrogenolysis is a type of hydrogenation that results in the cleavage of the C-X chemical bond, where C is a carbon atom and X is a sulfur, nitrogen or oxygen atom. The net result of a hydrogenolysis reaction is the formation of C-H and H-X chemical bonds. Thus, hydrodesulfurization is a hydrogenolysis reaction. Using ethanethiol (C2H5SH), a sulfur compound present in some petroleum refining streams, as an example, the hydrodesulfurization reaction can be expressed as:
Ethanethiol + Hydrogen ⇒ Ethane + Hydrogen Sulfide
C2H5SH + H2 ⇒ C2H6 + H2S
Catalysts
Many metals catalyze the HDS reaction, but it is those at the middle of the transition metal series that are most active. Ruthenium disulfide (RuS2) appears to be the single most active catalyst, but binary combinations of cobalt and molybdenum are also highly active.
In practice, most HDS units in petroleum refineries use catalysts based on cobalt-modified molybdenum disulfide (MoS2) together with smaller amounts of other metals. Aside from the MoS2 catalysts, nickel and tungsten are also used, depending on the nature of the feed. For example, nickel-wolfram (Ni-W) catalysts are more effective for the hydrodenitrification (HDN) which is also desired in many HDS units.
Metal sulfides are supported on materials with high surface areas. A typical support for HDS catalyst is alumina. The support allows the more expensive catalyst to be more widely distributed, giving rise to a larger fraction of the MoS2 that is catalytically active.
Bonyan Shimi and HDS
The Bonyan Shimi's main market for HDS was aimed at the Iranian petrol-chemical industry but since the HDS can be produced to any customers wishes Bonyan Shimi is actively approaching other market segments as well. The target group is set to the food industry as we strongly believe that we can serve that market successfully with full adaptation of the customers specifications.
Feel free and request a quotation.
Feel free to contact us for a free quotation and you will notice
that we can give you extremely competitive prices for a product which
meets international standards, we are way ahead of the Iranian based
competition. You can reach us at;
Export office :
No: 2, App 1, Shafaq Dd end, Vaezi all, Shariati str,
Hekmat, Tehran,
Islamic Republic of Iran
+98 21 22724700
+98 9 127 384 119
+98 21 22725270
export.BonyanShimi@mail.com
Head office :
No: 14, 3th floor, Golazin Blvd, Africa Blvd,
Zip: 1915713765
Tehran,
Islamic Republic of Iran
+98 21 22039141
+98 21 22039143
+98 21 22035636
BonyanShimi@mail.com
Feel free to contact us for a free quotation and you will notice that we can give you extremely competitive prices for a product which meets international standards, we are way ahead of the Iranian based competition.
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