Method for desalting crude oil

Details Method for desalting crude oil Method for desalting crude oil

C - Chemistry, Metallurgy

10

G

196/241

C10G 31/08 (2006.01)

Patent

CA 1248902

ABSTRACT OF THE DISCLOSURE METHOD FOR DESALTING CRUDE OIL The salt content of crude oil is reduced by washing crude oil containing residual salt water with wash water of lower salinity than the water present in the crude oil and allowing the resulting mixture to settle into a layer of crude oil of reduced salt water content and a layer of saline water. The quantity of wash water employed is greater than 7.5% by volume of the crude oil. The saline water may be recycled and a proportion removed from the recycle stream and a corresponding quantity of water of lower salinity added. Washing with relatively large quantities of water results in the formation of a less stable emulsion. Consequently, less severe conditions are required to break it to recover the desalted crude oil.

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