公开(公告)号：US10883055B2

公开(公告)日：2021-01-05

申请号：US15935471

申请日：2018-03-26

Applicant: ExxonMobil Research and Engineering Company

Inventor： Aruna Mohan ,  Mohsen S. Yeganeh ,  Daniel P. Cherney ,  Anthony S. Mennito ,  Shane P. Deighton ,  Jessica L. Vreeland

IPC: C10G53/12 ,  E21B43/20 ,  C09K8/584

Abstract: A method for selective extraction of naphthenic acids from an acidic crude oil, including: providing an acidic crude oil including naphthenic acids and having a total acid number (TAN) greater than 0.4; mixing the acidic crude oil with a first aqueous solution including water and a weak base to extract a portion of naphthenic acids from the acidic crude oil thereby creating a second aqueous solution containing a mixture of the portion of naphthenic acids, the water and the weak base in an emulsion; separating the second aqueous solution from the emulsion; wherein the second aqueous solution contains an additional portion of the acidic crude oil; adding a salt to the second aqueous solution, thereby causing the additional portion of the acidic crude oil to separate from the second aqueous solution; removing the additional portion of the acidic crude oil from the second aqueous solution; and extracting the portion of the naphthenic acids from the second aqueous solution.