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Low Flow in Pipes- posted in Ankur's blog

Dso

Started by khaled81, Dec 17 2005 08:45 AM

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#1 khaled81

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Posted 17 December 2005 - 08:45 AM

hi guys,
i need some help. i want to know what is the disulfide oils (DSO)
thank you

#2 mbeychok

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364 posts

Posted 17 December 2005 - 12:25 PM

Khaled:

I will assume that you are asking about the disulfide oils produced as a byproduct from a petroleum refinery Merox unit removing mercaptans from propane or butane. The reactions taking place in such a unit are:

mercaptan extraction reaction:

2RSH + 2NaOH ==> 2NaSR + 2H₂O

2 mols mercaptan + 2 mols caustic ==> 2 mols sodium mercaptide + 2 mols water

caustic regeneration reaction:

2NaSR + 0.5O₂ ==> RSSR + 2NaOH

2 mols sodium mercaptide + 0.5 mol oxygen ==> 1 mol disulfide oil + 2 mols caustic

the overall reaction:

2 RSH + 0.5O₂ ==> RSSR + H₂O

Many refineries dissolve the disulfides in a small amount of naphtha to separate and remove the disulfides from the regenerated caustic.