What is the typical desalination rate required for atmospheric and vacuum electrodesalination?

The salt content of the crude oil after dehydration is <3 mg/L, and the water content is <0.2%.

Are there standard requirements, or are they general guidelines?

Generally speaking, the salt content after desalination is more meaningful than the desalination rate, as there are currently no broad-spectrum demulsifiers available; it is only when the salt content is high that calculating the desalination rate makes sense. Here, we consider a salt content of ≤5 mg/L after desalination to be acceptable, and values around 6–7 mg/L are also fine – the requirements aren’t that strict.

This post was last edited by qugd on 2017-2-27 09:31. The desalination rate has little significance in guiding the electrodialysis process; what is crucial is the requirement regarding the salt content in the crude oil fed into the system, that is, the salt content after desalination must not exceed the limits specified for the crude oil feed. As the viscosity of the crude oil increases along with its acidity, the pressure required for desalination also rises. Conventional demulsifiers mixed with water no longer suffice to meet the requirements of electrodesalination, which necessitates greater efforts in the research of desalination processes. It is estimated that in the near future, a method of reducing the density and viscosity of crude oil by mixing it with a certain proportion of light distillates will be adopted; although this increases the load on the atmospheric distillation column, it facilitates reducing the impact of salts in downstream processing.

The desalination rate isn’t a very meaningful indicator; for refineries, what’s important are the parameters of the crude oil after desalination, ensuring that the salt content is no more than 3 mg/L and the water content is no more than 0.2%. Generally, a desalination rate of 97% is sufficient

My view is prediction, not the current process. This desalination method is used in laboratories; it is an effective sample treatment technique for determining the levels of certain metals in heavy oil and heavy crude oil. I have done this in a laboratory before. The effect is decent; at least it makes it easier to separate oil from water or polar extraction solvents.

It depends on the requirements of each company; the key factor is the type of crude oil, 90%