Diesel fuel with improved ignition characteristics

Patent metadata

Field	Value
Publication number	US-9862905-B2
Application number	US-201514680234-A
Country	US
Kind code	B2
Filing date	Apr 7, 2015
Priority date	Apr 8, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Diheterocyclo diazene dicarboxamides have been found to effectively reduce the ignition delay and/or as effective cetane number improvers in diesel fuels and is suitable for use in modern engines.

First claim

I claim:

1. A diesel fuel composition comprising a diesel base fuel and at least one diheterocyclo diazene dicarboxamide having the formula:

wherein R 1 , R 2 , R 3 and R 4 are each the same or different groups selected from alkyl groups or hydrogen, and A and B are same or different alkylene group having 3 to 5 carbon atoms or nitrogen containing aliphatic group having 1 nitrogen atom and 2 to 4 carbon atoms.

2. The composition of claim 1 wherein the heterocyclic group of the diheterocyclo diazene dicarboxamide contains a 5 or 6 member heterocyclic group.

3. The composition of claim 1 wherein each of the carbon atoms in A and B are optionally substituted with the same or different groups

wherein R 5 and R 6 are each the same or different groups selected from alkyl groups and hydrogen.

4. The composition of claim 3 wherein each of the R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are independently hydrogen or alkyl groups having 1 to 5 carbon atoms.

5. The composition of claim 1 wherein the diheterocyclo diazene dicarboxamide has the formula:

wherein R 69 R 70 are each independently selected from hydrogen or alkyl groups having 1 to 4 carbon atoms.

6. The composition of claim 1 wherein the diheterocyclo diazene dicarboxamide is selected from the group consisting of azodicarbonyl dipiperidine, and methanone, 1,1′-(1,2-diazenediyl)bis[1-(1-pyrrolidinyl)-diimide].

7. The composition of claim 1 wherein the diheterocyclo diazene dicarboxamide has the formula:

wherein R 1 , R 2 , R 3 and R 4 are each the same or different groups selected from alkyl groups or hydrogen, and A and B are same or different alkylene group having 3 to 5 carbon atoms.

8. The composition of claim 7 wherein each of the carbon atoms in A and B are optionally substituted with the same or different groups

wherein R 5 and R 6 are each the same or different groups selected from alkyl groups and hydrogen.

9. The composition of claim 8 wherein each of the R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are independently hydrogen or alkyl groups having 1 to 5 carbon atoms.

10. The composition of claim 1 wherein the diheterocyclo diazene dicarboxamide is azodicarbonyl dipiperidine.

11. The composition of claim 1 wherein the diheterocyclo diazene dicarboxamide is present in an amount of 0.005 to 5% based on the diesel fuel composition.

12. A method for operating a compression ignition engine and/or a vehicle which is powered by such an engine, which method comprises introducing into a combustion chamber of the engine a diesel fuel composition containing at least one diheterocyclo diazene dicarboxamide and running said engine, wherein the diheterocyclo diazene dicarboxamide has the formula:

wherein R 1 , R 2 , R 3 and R 4 are each the same or different groups selected from alkyl groups or hydrogen, and A and B are same or different alkylene group having 3 to 5 carbon atoms or nitrogen containing aliphatic group having 1 nitrogen atom and 2 to 4 carbon atoms.

13. The composition of claim 12 wherein each of the carbon atoms in A and B are optionally substituted with the same or different groups

wherein R 5 and R 6 are each the same or different groups selected from alkyl groups and hydrogen.

14. The composition of claim 13 wherein each of the R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are independently hydrogen or alkyl groups having 1 to 5 carbon atoms.

15. The composition of claim 12 wherein the diheterocyclo diazene dicarboxamide is azodicarbonyl dipiperidine.

Assignees

• Shell Oil Co

Inventors

• Prakash Arjun

Classifications

• C10L2200/0446

  Diesel · CPC title

• C10L2200/0259

  Nitrogen containing compounds · CPC title

• F02B47/04

  the substances being other than water or steam only · CPC title

• C10L1/22

  containing nitrogen · CPC title

• C10L2270/026

  for diesel engines, e.g. automobiles, stationary, marine · CPC title