5 replies to this topic

Do any of you have expereience of dewatering light crude down to 200ppm? Is there any proven technology with previous experience?
Please refer to the attached file for a specification.

Attached Files

•  Water_Removal_Design_Basis.xls   39.5KB   145 downloads

[gvdlans]

I don't know whether they can meet the 200 ppm spec, but you may ask a vendor such as http://www.gastechen.../desalters.html whether they can do this. They should be capable to steer you into the right direction...

[Zauberberg]

From what I know, based on my Crude Unit operational experience and literature knowledge, it is not possible to achieve such high percent of crude oil dewatering and desalination in a single-stage desalter.

When operating single-stage desalter, it is possible to remove about 90% of salts and provide for water content of desalted crude between 0.1-0.2%vol.
Multistage desalting units (usually two in series) are capable to achieve salt removal efficiency of 99% - if operating parameters and chemical dozing program are at their best.

Of course, I believe it is not possible to run the desalting unit at maximum efficiency 100% of time, especially if there are frequent crude switches (different types), regardless of good instrumentation and operational excellence. I think there is no chemical vendor that can guarantee 200ppm water content in desalted crude.

[Milutin]

Why anybody need crude oil specification of 200ppm. In case of diesel I can understand but not for crude oil.

Why anybody need crude oil specification of 200ppm. In case of diesel I can understand but not for crude oil.

200 ppm water comes from the design of the downstream refinery, which was designed for a dry light crude

[smalawi]

crude units main column will run on higher water content as long as it can be taken out in the reflux vessel.

If the reflux vessel is undersized then you neet to either raise the level to increase the residance time in the vessel or to look for another design alternative (coallser / bigger vessel)