METHOD OF PROCESSING HIGH-ACID CRUDE OIL Russian patent published in 2019 - IPC C10G9/14 C10G33/02 

FIELD: oil and gas industry.

SUBSTANCE: present invention relates to processing of high-acid crude oil in process of thermal cracking, including: a) desalting high-acid crude oil to produce a desalted crude oil; b) separating the desalted crude oil in the pre-fractionation column into a lighter hydrocarbon material and a heavier high-boiling material, the lighter hydrocarbon material not containing acidic compounds; c) sending heavier high-boiling material to the lower section of the fractionating column and mixing with the inner recycle component to obtain a secondary starting material; d) heating the secondary starting material obtained at step (c) to a high temperature to obtain hot starting material; e) thermal reaction of hot starting material obtained at step (d) in reactors for producing vaporous products; f) sending the vaporous products obtained at step (e) into a fractionating column for fractionation into product fractions, wherein the product fractions contain offgas with naphtha, a light gas oil product, heavy gas oil and oil fuel; g) passing offgas with naphtha obtained at step (f) into a gas separation section to separate gaseous products, including gaseous fuel and LPG, from the naphtha product; h) passing a stream of heavy gas oil obtained at step (f) to a recycling unit to obtain products containing naphtha, wherein the recycling unit is at least one of a hydrocracking unit and a fluidised catalyst cracker; i) directing lighter hydrocarbon material obtained in step (b), naphtha separated at step (g), and naphtha obtained in step (h) to a naphtha/petrol processing section to obtain a desired lighter product, where secondary initial material obtained at step (c) contains heavier high-boiling material having a boiling point of more than 200 °C obtained at step (b) and with vaporous products obtained at step (e), condensed as internal recirculating component.

EFFECT: complete decomposition of naphthenic acid compounds to harmless compounds which do not cause corrosion of equipment and pipelines, obtaining lighter hydrocarbon materials with minimum capital expenditures for maximum processing of residues into valuable products.

11 cl, 3 ex, 7 tbl, 2 dwg