Process for conversion of high acidic crude oils

Patent metadata

Field	Value
Publication number	US-2019225892-A1
Application number	US-201816206936-A
Country	US
Kind code	A1
Filing date	Nov 30, 2018
Priority date	Jan 20, 2018
Publication date	Jul 25, 2019
Grant date	—

Abstract

The present invention relates to crude oil processing, particularly related to conversion of crude oil containing high amount of naphthenic acid compounds to lighter hydrocarbon materials with minimum capital expenditure. The invented process utilizes a novel scheme for high TAN crude oils by employing thermal cracking process to maximize the residue conversion to valuable products, which require minimum modifications in unit metallurgies and corrosion inhibitor injection schemes in refineries.

First claim

1 . A method for processing of high acidic crude oil by thermal cracking process, wherein the said method comprises the steps of:
a) desalting high acidic crude oil to obtain desalted crude; b) separating the desalted crude in a pre-fractionator column into lighter hydrocarbon material and heavier boiling material, wherein the lighter hydrocarbon material does not contain acidic compounds; c) routing the heavier boiling material to the bottom section of a fractionator column and mixing with internal recycle component to obtain a secondary feed; d) heating the secondary feed obtained in step (c) to a high temperature to obtain a hot feed; e) thermally reacting the hot feed obtained in step (d) in reactors to obtain product vapors; f) routing the product vapors obtained in step (e) to the fractionator column for fractionation into product fractions.

2 . The method as claimed in claim 1 , wherein the desalting step (a) is carried out under application of electric field.

3 . The method as claimed in claim 1 , wherein the high acidic crude oil has high contents of acidic compounds with total acidic number (TAN) greater than 0.5 mg KOH/g Oil.

4 . The method as claimed in claim 1 , wherein the high acidic crude oil is a blend of low TAN and high TAN crude oils, wherein the TAN of the mixture of the crude oils is greater than 0.5 mgKOH/g oil.

5 . The method as claimed in claim 1 , wherein the lighter hydrocarbon material has boiling point lower than 200° C.

6 . The method as claimed in claim 1 , wherein the heavier boiling material has boiling point greater than 200° C.

7 . The method as claimed in claim 1 , wherein removal of the lighter hydrocarbon and heavier boiling material from the desalted crude in step (b) is carried out at pressure in the range of 1-2 Kg/cm 2 (g) and top temperature in the range of 150 to 250° C.

8 . The method as claimed in claim 1 , wherein the secondary feed is heated in step (d) at the temperature in the range of 470 to 520° C.

9 . The method as claimed in claim 1 , wherein the thermal reactions in step (e) are carried out at the desired operating temperature in the range of 470 to 520° C. and desired operating pressure in the range of 0.5 to 5 Kg/cm 2 (g).

10 . The method as claimed in claim 1 , wherein the thermal reactions in step (e) are carried out with residence time of more than 10 hours.

11 . The method as claimed in claim 1 , wherein the thermal cracking reaction in step (e) is carried out in feeding mode of operation.

12 . The method as claimed in claim 1 , wherein the product fractions obtained in step (f) comprises of offgases with naphtha, light gasoil product, heavy gasoil, and fuel oil.

13 . The method as claimed in claim 12 , wherein the offgases with naphtha is passed to a gas separation section to separate gaseous products comprising of fuel gas and LPG from naphtha product.

14 . The method as claimed in claim 12 , wherein the heavy gasoil stream is sent to a secondary processing unit to obtain products including naphtha, wherein the secondary processing unit is at least one of hydrocracker unit and fluid catalytic cracking unit.

15 . The method as claimed in claim 1 , wherein the lighter hydrocarbon material, the naphtha from the gas separation section and the naphtha from the secondary processing unit are treated to obtain desired lighter product.

16 . The method as claimed in claim 1 , wherein the thermal cracking process produces solid petroleum coke as a byproduct.

Assignees

• Indian Oil Corp Ltd

Inventors

• Pradeep Ponoly Ramachandran
• Das Satyen Kumar
• Prasad Terapalli Hari Venkata Devi
• Kottakuna Arjun Kumar
• Rajesh
• Pastagia Kashyapkumar Mahendra
• Bhattacharyya Debasis
• Mazumdar Sanjiv Kumar
• RAMAKUMAR Sankara Sri Venkata

Classifications

• C10G33/02

  with electrical or magnetic means · CPC title

• C10G9/14

  in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means · CPC title

• C10G9/005

  Coking (in order to produce liquid products mainly) · CPC title

• C10G2300/203

  Naphthenic acids, TAN · CPC title

• C10G9/34 Primary

  by direct contact with inert preheated fluids, e.g. with molten metals or salts · CPC title