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Diolefin Saturation Reactor

thread798-45044

Diolefin Saturation Reactor

Diolefin Saturation Reactor

(OP)
We have and HDS unit that processes 100% coker naphtha (I don't recommend this operation to ANYONE).  It has 3 reactors.  The 1st Reactor was ment to be for diolefin saturation and it is placed before the furnace.  Sometime ago, it was decided to convert this unit to heavy coker naphtha and a depentanizer was installed before the unit.  Since then (I presume) the 1st reactor has become useless.  There is no dT, it is too cold to pick silica, ect.  I recommended that this reactor be taken out of service.  However, at least twice a year the depentanizer is down for about 7 days.  What would be the consequence of removing this reactor.  Could it be possible to plug the unit heater rapidly?

RE: Diolefin Saturation Reactor

I think you are taking a chance by not having the diolefine reactor in line. There can be diolefines carryover to the next reactor with consequent catalyst fouling and reduced catalyst life. Are you sure that your heavy coker naphtha does not contain diolefines? I would be very surprised if it is so.

Why do you wish to bypass the diolefine reactor? If it is because the feed temperature is not adequate, it would be better to provide a heat source.

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