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Sophie - Merox is short for MERcaptan OXidisation. This process converts smelly mercaptan sulphur into disulphide oil so strictly speaking the sulphur molecule is converted to another form rather than being removed in this process. (Ethyl Mercaptan is the rotten egg smell that is added to LPG so you can detect a leak from your gas bottle).
Refining is very complex because of the huge number and variety of long chain molecules involved. There are only a handful of processes where stoichiometry is used to describe what's going on.
Peter.
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