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US 6,172,014 B2Granted
Method of lubricating compression cylinders used in the manufacture of high-pressure polyethylene
AssigneePennzoil-Quaker State Company
InventorDouglas Meyers
Life of this patent
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Abstract
Disclosed is an improved method of reducing compressor gas leakage by providing a compression cylinder with a lubricant comprising less than about 1% of a synergistic mixture of antioxidants.
Claims16
A method of reducing compressor gas leakage comprising the step of:
- providing a compression cylinder with a lubricant comprising less than about 1 wt % of an antioxidant mixture, wherein the antioxidant mixture comprises at least one phosphite antioxidant and at least one second antioxidant.
A method of reducing compressor gas leakage from a compressor used in high pressure olefin polymerization, the method comprising:
- providing a lubricant composition to a compression cylinder of the compressor, wherein the lubricant composition comprises at least one phosphite antioxidant and at least one second antioxidant and wherein the total antioxidants present are in a range of about 0.4 to about 1.2 wt %, based on the total weight of the lubricant composition.
A composition that reduces cylinder gas leakage from a compressor used in high pressure olefin polymerization and increases time intervals between replacement of worn cylinder assemblies comprising:
- a lubricant;
- and
- antioxidants, wherein the antioxidants comprise at least one phosphite antioxidant, at least one amine antioxidant, and at least one phenolic antioxidant and wherein the total antioxidants present are in a range of about 0.4 to about 1.2 wt %, based on the total weight of the composition.
Dependencies are inferred from the claim text.