Sulfur Chemistry Overview
Reactor Resuorces provides the following chemicals for catalyst sulfiding and steam cracker tube passivation:
Dimethyl Disulfide (DMDS)
Dimethyl Disulfide (DMDS) is the most commonly used chemical for the activation of hydrotreating and hydrocracking catalysts (a.k.a. sulfiding or pre-sulfiding). These catalysts contain metal oxides that must be converted to the active metal sulfide prior to use. DMDS injection begins once the reactor reaches the proper temperature level, quickly decomposing to form the H2S needed to convert the metallic oxides to catalystic sulfides.
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Dimethyl Sulfide (DMS)
Dimethyl Sulfide (DMS) is continuously injected into the steam cracking furnace section of an ethylene plant to inhibit coke formation and to control CO formation throughout the process.
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Tertiary Butyl Polysulfide (TBPS)
Tertiary Butyl Polysulfide (TBPS) is a mercaptan that can be used as a sulfiding agent to activate hydrotreating and hydrocracking catalysts. TBPS offers some advantages over DMDS for in-situ sulfiding, although more TBPS will need to be injected since it contains less sulfur than DMDS.
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