PURPOSE: To desalt efficiently a heavy hydrocarbon oil, by adding a light oil to a heavy hydrocarbon oil, adding water to the resulting oil mixture and introducing the resulting mixture through a line having no throttle mechanism into a separator, where salt-contg. water is separated.
CONSTITUTION: 1W3pts.wt. Light oil (e.g. gas oil) fed through a line 12 is mixed with 1pt.wt. heavy hydrocarbon oil (e.g. vacuum distillation residue of fuel oil) fed through 1 to form an oil mixture having a specific gravity of 0.94 or below. 15W30wt% water fed through a line 14 is added to the oil mixture. The resulting mixture is passed through a line 6 having no throttle, mechanism (which may be provided with a battle, a valve, etc., provided they causes a pressure difference of only 0.2kg/cm2 or below) into an electrical separator 21. Salt-contg. water is discharged through a line 9 and oil component is fed to a light oil recovery tower 22. The desalted heavy hydrocarbon oil is recovered through a line 10 and the recovered light oil is recycled through lines 11, 3 for reuse.
KASAI HIROAKI
YOKOMORI YUKIHIRO
HARA NAOMI
