Oil recovery methods and oil recovery devices

Abstract

The oil recovery method includes: a first separation step, in which oil-containing wastewater is extracted with a solvent to transfer the oil to the solvent, thereby separating the oil-containing solvent from the wastewater; a second separation step, in which gas is injected into the wastewater separated in the first separation step and gas-liquid mixing is performed to transfer the solvent remaining in the wastewater to the gas, thereby obtaining a gas containing the solvent; and a third separation step, in which the solvent-containing gas obtained in the second separation step is cooled to condense the solvent and separate it from the gas.

Images