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US 11,525,100 B2Granted
Biodegradable fluids
AssigneePetro-Canada Lubricants Inc.
InventorsCecelia Dai, Vittoria Lopopolo, Atieh Ghadiri, Doug Irvine
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Abstract
The incorporation of highly refined, low viscosity index base oils along with a polymeric thickener produces a final readily biodegradable fluid with a significantly high viscosity. The present invention allows the formulation of a high viscosity readily biodegradable fluid where the vast majority of the fluid is mineral oil. Previous uses of mineral oils only allowed for formulation of substantially lower viscosity readily biodegradable fluids.
Claims10
A readily biodegradable fluid, comprising:
- a mineral oil base fluid portion, wherein the mineral oil base fluid portion comprises one or more highly refined mineral oils having a ratio of paraffin content to cycloparaffin content of at least 3:2 and a viscosity index of at least 110;
- and
- a polymeric thickener portion, wherein the polymeric thickener portion comprises polymethacrylate,
- wherein the readily biodegradable fluid is readily biodegradable, and wherein a readily biodegradable fluid is readily biodegradable when at least 60% of organic carbon in the readily biodegradable fluid is converted to carbon dioxide in 28 days when exposed to freshwater microorganisms.
1 more element
A method for preparing a readily biodegradable fluid, comprising:
- preparing a mineral oil base fluid portion, wherein the mineral oil base fluid portion comprises one or more highly refined mineral oils having a ratio of paraffin content to cycloparaffin content of at least 3:2 and a viscosity index of at least 110;
- and
- mixing a polymeric thickener portion into the mineral oil base fluid portion, wherein the polymeric thickener portion comprises polymethacrylate, and wherein the mixing is carried out at a temperature of about 20° C. to about 65° C., to produce the readily biodegradable fluid,
- wherein the readily biodegradable fluid is readily biodegradable, and wherein a readily biodegradable fluid is readily biodegradable when at least 60% of organic carbon in the readily biodegradable fluid is converted to carbon dioxide in 28 days when exposed to freshwater microorganisms.
1 more element
Dependencies are inferred from the claim text.