METHOD FOR DEHYDRATION AND DESALTING OF PETROLEUM Russian patent published in 2006 - IPC C10G33/04 

FIELD: petroleum chemistry, chemical technology.

SUBSTANCE: invention relates to using anionic surface-active substances as a petroleum-soluble demulsifying agent used in processes of deep dehydration and desalting of the oil raw in it preparing to the further processing. For realization of method demulsifying additive is added to the oil emulsion by dosing pump or into pipeline directly after a hole, or in the raw feeding line to a device for petroleum preparing. As a demulsifying additive method involves using solution of anionic surface-active substance based on carboxymethylates of oxyethylated isononylphenols of the formula: C₉H₁₉-C₆H₄-O-(CH₂-CH₂O)_n-CH₂COONa wherein n = 10-12 in the presence of methanol-aldehyde fraction as a low-temperature solvent representing waste in production of butyl alcohols. The process is carried out at temperature 80°C. Method provides enhancing effectiveness of dehydration and desalting degree of crude oil.

EFFECT: improved method for dehydration and desalting.

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