Sulfur Chemistry Overview

Reactor Resuorces provides the following chemicals for catalyst sulfiding and for steam cracker tube passivation:

Dimethyl Disulfide (DMDS)

Dimethyl Disulfide (DMDS) is the most commonly used chemical for sulfiding hydrotreating and hydrocracking catalysts.  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.  DMDS quickly decomposes to form the H2S needed to convert the oxides to sulfides.
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Dimethyl Sulfide (DMS)

Dimethyl Sulfide (DMS) is injected continuously into the steam cracking furnace section of ethylene plants 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 the extra cost may outweigh the benefits.
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