February 2017

Special Focus: Clean Fuels

Put acid gas hydrocarbons in their place with staged regeneration

Common organic contaminants of Claus sulfur recovery unit (SRU) acid gas (AG) feed include: heavy hydrocarbons, in general; benzene, toluene, ethylbenzene and xylene (BTEX), in particular; and methanol (CH3OH).

Bela, F., WorleyParsons

Common organic contaminants of Claus sulfur recovery unit (SRU) acid gas (AG) feed include: heavy hydrocarbons, in general; benzene, toluene, ethylbenzene and xylene (BTEX), in particular; and methanol (CH3OH). These contaminants become problematic when inadequately oxidized to carbon monoxide (CO) in the reaction furnace, due to low temperatures resulting from low hydrogen sulfide (H2S) and high carbon dioxide (CO2) concentrations (i.e., “lean feed”). Incomplete destruction of heavy hydrocarbons results in solid carbon particles, or soot, which foul exchangers and catalyst and discolor product sulfur. As soot levels increase, the color of solid sulfur progressively changes from dull yellow

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