Fuel for compression-ignition engines based on monooxymethylene dimethylether

Patent metadata

Field	Value
Publication number	US-9447355-B2
Application number	US-201414165793-A
Country	US
Kind code	B2
Filing date	Jan 28, 2014
Priority date	Jan 28, 2013
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A fuel for compression-ignition engines is described, which contains mono oxymethylene dimethyl ether and has a cetane number of ≧51. This fuel for compression-ignition engines advantageously contains oxygenates of the n-polyoxaalkane type and/or di-tert-butyl peroxide. Up to about 20% by weight of the mono oxymethylene dimethyl ether can be replaced by dimethyl ether.

First claim

The invention claimed is:

1. A fuel for compression-ignition engines, containing,
at least 80% by weight mono oxymethylene dimethylether; and
at least one oxygenate of the n-polyoxaalkane type, which is selected from the group consisting of polyoxymethylene dialkylethers of the formula
RO(—CH 2 O—) n R, wherein n=4 to 10 and R=an alkyl group, polyethylene glycol dialkylethers and/or polyethylene glycol monoalkylether formals, wherein the fuel has a cetane number of ≧48.6.

2. A fuel according to claim 1 , wherein the fuel has a cetane number of 51.

3. A fuel according to claim 1 , wherein the fuel contains up to 20% by weight of at least one oxygenate of the n-polyoxaalkane type, which is selected from the group consisting of polyoxymethylene dialkyl ethers of the formula RO(—CH 2 O—) n R wherein n=4 to 10 and R=an alkyl group, polyethylene glycol dialkylethers and/or polyethylene glycol monoalkylether formals.

4. A fuel according to claim 1 , wherein the polyoxymethylene dialkylethers are polyoxymethylene dimethylethers, the polyethylene glycol dialkylethers are polyethylene glycol dimethylethers and the polyethylene glycol monoalkyletherformals are polyethylene glycol monomethyl ether formals.

5. A fuel according to claim 4 , wherein the polyoxymethylene dimethylether has a molecular weight MG of 100 to 400 daltons.

6. A fuel according to claim 4 , wherein the polyethylene glycol dimethylether has a molecular weight MG of 400 to 1000 daltons.

7. A fuel according to claim 4 , wherein the polyethylene glycol monomethylether formal has a molecular weight MG of 400 to 1000 daltons.

8. A fuel according to claim 1 , wherein the fuel contains di-tert-butyl peroxide.

9. A fuel according to claim 8 , wherein the fuel contains up to 0.3% by weight, di-tert-butyl peroxide.

10. A fuel according to claim 8 , wherein the fuel contains up to 0.1% by weight, di-tert-butyl peroxide.

11. A fuel according to claim 1 , wherein up to 20% by weight of the monooxymethylene dimethylether is replaced by dimethyl ether.

12. A fuel according to claim 1 , wherein the fuel does not contain any hydrocarbons.

13. A fuel according to claim 1 , wherein the fuel contains up to 5% by weight of at least one oxygenate of the n-polyoxaalkane type, which is selected from the group consisting of polyoxymethylene dialkyl ethers of the formula RO(—CH 2 O—) n R wherein n=4 to 10 and R=an alkyl group, polyethylene glycol dialkylethers and/or polyethylene glycol monoalkylether formals.

14. A fuel according to claim 1 , wherein the fuel contains up to 3% by weight of at least one oxygenate of the n-polyoxaalkane type, which is selected from the group consisting of polyoxymethylene dialkyl ethers of the formula RO(—CH 2 O—) n R wherein n=4 to 10 and R=an alkyl group, polyethylene glycol dialkylethers and/or polyethylene glycol monoalkylether formals.

15. A fuel for compression-ignition engines containing:
at least 80% by weight mono oxymethylene dimethylether,
1 to 20% by weight of at least one oxygenate of the n-polyoxaalkane type, selected from the group consisting of polyoxymethylene dimethyl ether, polyethylene glycol dimethyl ether and/or polyethylene glycol monomethylether formals, and
0.01 to 0.3% by weight di-tert-butyl peroxide,
wherein the fuel has a cetane number of ≧48.6.

Assignees

• Jacob Eberhard
• Man Truck & Bus Ag

Inventors

• Jacob Eberhard

Classifications

• C10L10/12

  for improving the cetane number · CPC title

• C10L1/026 Primary

  for compression ignition · CPC title

• C10L2300/40

  Mixture of four or more components · CPC title

• C10L1/1852

  Ethers; Acetals; Ketals; Orthoesters · CPC title

• C10L2230/22

  for improving fuel economy or fuel efficiency · CPC title