Liquid phase additive for use in thermal cracking process to improve product yields

Patent metadata

Field	Value
Publication number	US-9868903-B2
Application number	US-201514668446-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Mar 31, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

The present invention relates to a liquid phase additive comprising an alkyl nitrate; a petroleum sulphonates; an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines; a hindered phenol based compounds; a phosphate esters and an aliphatic alcohols for use in delayed coking process with decreased coke yield and increased yield of liquid and/or gaseous product and a process for preparing the liquid phase additive. The present invention also relates to a process for thermal cracking of petroleum residue producing petroleum coke and lighter hydrocarbon products by using liquid phase additive.

First claim

We claim:

1. A liquid phase additive comprising:
(i) an alkyl nitrate;
(ii) a petroleum sulphonates;
(iii) an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines;
(iv) a hindered phenol based compounds;
(v) a phosphate esters; and
(vi) an aliphatic alcohols.

2. The additive as claimed in claim 1 , wherein the alkyl nitrate is selected from 2-ethylhexyl nitrate and isopropyl nitrate.

3. The additive as claimed in claim 1 , wherein the petroleum sulphonates is selected from calcium petroleum sulphonates of less than 100 TBN.

4. The additive as claimed in claim 1 , wherein the aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines are selected from dimethyl-cyclohexylamine, dibutylamine, mono & di-ethanol amine, and benzylamine.

5. The additive as claimed in claim 1 , wherein the hindered phenol based compounds is selected from 2,6 ditertiary-butyl-4-methyl-phenol, 2,4 dimethyl-6-tertiary-butyl-phenol, and 2,6 ditertiary-butyl-phenol.

6. The additive as claimed in claim 1 , wherein the phosphate esters is selected from trialkyl, and triaryl phosphates.

7. The additive as claimed in claim 1 , wherein the aliphatic alcohols is selected from butanol, hexanol, 2-ethylhexanol and mixtures thereof.

8. The additive as claimed in claim 1 , wherein an amount of the alkyl nitrate is in the range of 30 to 90% w/w.

9. The additive as claimed in claim 1 , wherein an amount of the petroleum sulphonates is in the range of 2 to 30% w/w.

10. The additive as claimed in claim 1 , wherein an amount of the aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines is in the range of 1 to 10% w/w.

11. The additive as claimed in claim 1 , wherein an amount of the hindered phenol based compounds is in the range of 0.1-5% w/w.

12. The additive as claimed in claim 1 , wherein an amount of phosphate esters is in the range of 1-15% w/w.

13. The additive as claimed in claim 1 , wherein an amount of the aliphatic alcohols is in the range of 1-20% w/w.

14. A process for preparing a liquid phase additive, comprising
(i) providing an alkyl nitrate in a reactor and stirring the same;
(ii) adding a petroleum sulphonates; an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines; a hindered phenol based compounds; a phosphate esters; and an aliphatic alcohols, in to the reactor of step (i) while stirring;
(iii) heating the contents of step (ii) to 40-50° C. and stirring for 30 minutes; and
(iv) cooling the contents of step (iii) to ambient temperature to obtain the liquid phase additive.

15. A process for thermal cracking of petroleum residue by delayed coking, the process comprising the steps of:
(a) feeding a hydrocarbon feedstock in a delayed coker reactor unit,
(b) adding a liquid phase additive comprising an alkyl nitrate; a petroleum sulphonates; an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines; a hindered phenol based compounds; a phosphate esters; and an aliphatic alcohols, and
(c) heating the reactor at a predetermined heating rate.

16. The process as claimed in claim 15 , wherein the liquid phase additive is added in an amount of 100 to 20000 ppm.

17. The process as claimed in claim 15 , wherein the hydrocarbon feed stock has Conradson carbon residue content above 4 wt % and minimum density of 0.9 g/cc.

Assignees

• Indian Oil Corp Ltd
• Indian Oil Corp Ltd

Inventors

• Das Satyen Kumar
• Pradeep Ponoly Ramachandran
• Prasad Terapalli Hari Venkata Devi
• Dixit Jagdev Kumar
• Thapa Gautam
• Thakur Ram Mohan
• Sharma Vinod Kumar
• Bhattacharyya Debasis
• Puri Suresh Kumar
• Gupta Anurag Ateet
• Kumar Brijesh
• Das Biswapriya
• Malhotra Ravinder Kumar

Classifications

• C10G2300/1033

  Oil well production fluids · CPC title

• C10G9/00

  Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils · CPC title

• C10G2300/107

  Atmospheric residues having a boiling point of at least about 538 °C · CPC title

• C10G75/04

  by addition of antifouling agents · CPC title

• C10G9/005 Primary

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