By: Pvs Group  09-12-2011

The main function of desalters, also known as dewater process units, is to remove the salt and water from the crude oil. However, many other contaminants such as silt, rust, clay, and other debris need to be removed as well. Desalters are an integral part of any refining process or operation. They are usually the first step in the refining process.Desalting the crude oil is a major step of any oil processing. Failing to lower the salt and other contaminants from the crude oil can cause corrosion and fouling to the downstream equipment and also lower the economical value of the crude due to the high cost of production.

Desalting is a major source of wastewater production in the refining process, and therefore a water treatment option should be considered alongside the process.

The theory behind the desalting process can be summarized as follows: the desalter removes contaminants from crude oil first by emulsifying the crude oil with chemicals and then washing the oil thoroughly with water, thereby ensuring thorough contact of the water and oil.

The salts containing some of the metals that can poison catalysts are dissolved in the water phase. After the oil has been washed and mixed, resulting in an emulsion of oil and water, demulsifying chemicals are added and electrostatic fields are used to break up the emulsion.

PVSG is committed to provide desalting units capable of minimizing the salt and contaminant levels in crude oil. We can also provide clients with wastewater treatment options.

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