Engine lubricants containing a polyether

Patent metadata

Field	Value
Publication number	US-9593292-B2
Application number	US-201414773916-A
Country	US
Kind code	B2
Filing date	Feb 17, 2014
Priority date	Mar 13, 2013
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A lubricant comprising (a) an oil of lubricating viscosity; (b) a polyether of number average molecular weight 1000 to 10,000; said polyether comprising alkylene oxide monomer units, where the alkylene group contains 3 to 6 carbon atoms, and ethylene oxide monomer units; and (c) one or more anti-foam agents, where the lubricant has a sulfated ash content of less than about 0.7 percent, is useful for lubricating a stationary gas engine where the engine drives a compressor and where both the engine and the compressor are lubricated with the same lubricant.

First claim

What is claimed is:

1. A method for lubricating a sump-lubricated, internal combustion stationary gas engine that is fueled by natural gas, wherein the engine drives a compressor and wherein both the engine and the compressor are lubricated with the same lubricant, comprising supplying to said engine a lubricant comprising:
(a) an oil of lubricating viscosity;
(b) about 0.02 to about 0.08 percent by weight a polyether, a polyetheramine, or mixtures thereof, of number average molecular weight about 1000 to about 10,000; said polyether, polyetheramine, or mixtures thereof comprising alkylene oxide monomer units, where the alkylene group contains 3 to 6 carbon atoms, and ethylene oxide monomer units;
(c) about 10 to about 300 parts per million by weight of one or more anti-foam agents, provided that the amount of silicon-containing antifoam agents is less than about 70 parts per million by weight; and
(g) about 0.5 to about 5 percent by weight of a metal-containing detergent;
wherein said lubricant has a sulfated ash content of about 0.01 percent to less than about 0.7 percent; and
wherein said lubricant is also used to lubricate the compressor that is driven by the engine.

2. The method of claim 1 wherein the polyether, polyetheramine, or mixtures thereof comprises propylene oxide monomer units and about 5 to about 95 weight percent ethylene oxide units.

3. The method of claim 1 further comprising (d) about 0.05 to about 0.5 percent by weight a polyether of number average molecular weight about 300 to about 5,000; said polyether comprising propylene oxide monomer units and less than about 5 weight percent ethylene oxide units.

4. The method of claim 1 —wherein the anti-foam agent (c) comprises a non-silicon polymeric antifoam agent.

5. The method of claim 4 wherein the silicon-free polymeric antifoam agent comprises an alkyl acrylate polymer.

6. The method of claim 1 further comprising (f) about 0.5 to about 6 percent by weight of an ashless polyalkylene succinimide dispersant.

7. The method of claim 1 further comprising (h) about 0.001 to about 0.1 percent by weight of an aromatic triazole.

8. The method of claim 1 wherein the oil of lubricating viscosity comprises an API Group I oil.

9. The method of claim 1 wherein the compressor is a multiple stage compressor which includes at least one scrubber unit.

10. The method of claim 1 wherein the compressor is used to compress natural gas.

Assignees

• Lubrizol Corp

Inventors

• Carrick Virginia A
• Haas Alvin E
• Vilardo Jonathan S

Classifications

• C10M2219/022

  of hydrocarbons, e.g. olefines · CPC title

• C10M2209/107

  of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 · CPC title

• C10N2030/12

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

• C10N2030/10

  Inhibition of oxidation, e.g. anti-oxidants · CPC title

• C10M2201/087

  Boron oxides, acids or salts · CPC title