Crude oil recovery device

Abstract

Provided is a crude oil recovery device for recovering crude oil from an oil-containing mixture in a stable manner and at low running cost. The crude oil recovery device for extracting crude oil from an oil-containing mixture composed of crude oil and both or one of water and solid, including an extraction tank for mixing the oil-containing mixture with an extracting solvent, and an evaporation/liquefaction unit for distilling an extraction solution after extraction, wherein naphtha, which is a crude oil component of the oil-containing mixture, is reused as the extracting solvent, the naphtha being a distillate obtained by distillation of the extraction solution.

1 . A crude oil recovery device for extracting crude oil from an oil-containing mixture composed of water, solid and crude oil, comprising:
 an extraction tank for mixing the oil-containing mixture with an extracting solvent; and   an evaporation/liquefaction unit for distilling an extraction solution after extraction,   wherein naphtha, which is a crude oil component of the oil-containing mixture, is reused as the extracting solvent, the naphtha being a distillate obtained by distillation of the extraction solution.   
     
     
         2 . The crude oil recovery device according to  claim 1 ,
 wherein an aqueous phase containing solid is removed from the extraction tank after completion of the extraction, a new oil-containing mixture is introduced to the extraction tank, and an extraction operation is performed at least once using a remaining extraction solution.   
     
     
         3 . The crude oil recovery device according to  claim 1 , which is provided with a reproduced naphtha tank for storing liquefied reproduced naphtha in a downstream of a liquefaction unit. 
     
     
         4 . The crude oil recovery device according to  claim 1 , which is provided with a separation tank for separating a mixed solution into an oil phase and an aqueous phase in a downstream of the extraction tank. 
     
     
         5 . The crude oil recovery device according to  claim 1 , which is provided with a centrifugal separator for separating a mixed solution into an oil phase and an aqueous phase in a downstream of the extraction tank. 
     
     
         6 . The crude oil recovery device according to  claim 1 , further comprising a tank for storing the extraction solution containing crude oil after the extraction, and reusing a part of or all of the extraction solution as the extracting solvent. 
     
     
         7 . The crude oil recovery device according to  claim 1 , wherein evaporation temperature of the extraction solution is 80° C. or lower under normal pressure. 
     
     
         8 . The crude oil recovery device according to  claim 1 , wherein evaporation temperature of the extraction solution is 180° C. or lower under normal pressure. 
     
     
         9 . The crude oil recovery device according to  claim 3 , wherein the reproduced naphtha tank is provided with a pump or a valve for taking out the reproduced naphtha from a system.