Corrosion inhibitors for fuels and lubricants

Patent metadata

Field	Value
Publication number	US-10240100-B2
Application number	US-201515115587-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Jan 29, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

First claim

The invention claimed is:

1. A method of inhibiting corrosion in a fuel system, the method comprising:
passing a fuel through a fuel system, wherein the fuel comprises:
at least one of an alkali metal, an alkaline earth metal, and zinc in an amount of at least 0.1 ppm by weight; and
a polymer having a statistical average of
at least 4 acid groups per polymer chain,
a ratio of carbon atoms per acid group of 7 to 35, and
an acid number of 80 to 320 mg KOH/g, determined by potentiographic titration with 0.5 molar aqueous hydrochloric acid after heating in 0.5 molar ethanolic potassium hydroxide solution for three hours.

2. The method according to claim 1 , wherein the fuel comprises at least one of sodium, zinc, magnesium and calcium.

3. The method according to claim 1 , wherein the acid groups are carboxyl groups.

4. The method according to claim 1 , wherein the polymer comprises up to 50 acid groups per polymer chain.

5. The method according to claim 1 , wherein the polymer comprises not more than 5 functional groups other than oxygen-containing functional groups and nitrogen-containing functional groups per polymer chain.

6. The method according to claim 1 , wherein the polymer comprises not more than 3 oxygen-containing functional groups per polymer chain other than carbonate groups, ether groups or ester groups.

7. The method according to claim 1 , wherein the polymer comprises not more than 20 ether groups per polymer chain.

8. The method according to claim 1 , wherein the polymer comprises not more than 50 carbonate groups or ester groups per polymer chain.

9. The method according to claim 1 , wherein the polymer has a weight-average molecular weight Mw of 0.5 to 20 kDa (determined by gel permeation chromatography with tetrahydrofuran and polystyrene as standard) and a polydispersity of 1 to 10.

10. The method according to claim 1 , wherein the fuel system comprises an article that comprises at least one of iron, steel, and a nonferrous metal.

11. The method according to claim 1 , wherein the fuel system comprises an article that comprises copper.

12. The method according to claim 1 , wherein the fuel is a diesel fuel or gasoline fuel.

13. The method according to claim 1 , wherein the polymer has a solubility in toluene at 20° C. of at least 0.5 g/100 mL.

14. A method of inhibiting corrosion in a diesel fuel system, the method comprising:
passing a diesel fuel through a fuel system, wherein the diesel fuel comprises:
at least one of an alkali metal, an alkaline earth metal, and zinc in an amount of at least 0.1 ppm by weight;
a polymer having a statistical average of
at least 4 acid groups per polymer chain,
a ratio of carbon atoms per acid group of 7 to 35, and
an acid number of 80 to 320 mg KOH/g, determined by potentiographic titration with 0.5 molar aqueous hydrochloric acid after heating in 0.5 molar ethanolic potassium hydroxide solution for three hours; and

at least one additive selected from the group consisting of a detergent additive, a carrier oil, a cold flow improver, a lubricity improver, a corrosion inhibitor other than the polymer, a demulsifier, a dehazer, an antifoam, a cetane number improver, a combustion improver, an antioxidant, a stabilizer, an antistat, a metallocene, a metal deactivator, a dye and a solvent.

15. A method of inhibiting corrosion in a gasoline system, the method comprising:
passing gasoline through a fuel system, wherein the gasoline comprises:
at least one of an alkali metal, an alkaline earth metal, and zinc in an amount of at least 0.1 ppm by weight;
a polymer having a statistical average of
at least 4 acid groups per polymer chain,
a ratio of carbon atoms per acid group of 7 to 35, and
an acid number of 80 to 320 mg KOH/g, determined by potentiographic titration with 0.5 molar aqueous hydrochloric acid after heating in 0.5 molar ethanolic potassium hydroxide solution for three hours; and

at least one additive selected from the group consisting of a lubricity improver, a corrosion inhibitor other than the polymer, a demulsifier, a dehazer, an antifoam, a combustion improver, an antioxidant, a stabilizer, an antistat, a metallocene, a metal deactivator, a dye, and a solvent.

Assignees

• Basf Se

Inventors

• Mezger Jochen
• Peretolchin Maxim
• Flores-Figueroa Aaron
• Hansch Markus
• Voelkel Ludwig
• Garcia Castro Ivette
• Muehlbach Klaus
• Boehnke Harald

Classifications

• C10N2060/00

  Chemical after-treatment of the constituents of the lubricating composition · CPC title

• C10N2030/04

  Detergent property or dispersant property · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title

• C10N2040/255

  Gasoline engines · CPC title

• C10N2040/253

  Small diesel engines · CPC title