Enzymatically-degummed oil and uses thereof

Patent metadata

Field	Value
Publication number	US-9997273-B2
Application number	US-201314654167-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 20, 2012
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

An electrical device containing an enzymatically-degummed vegetable oil is disclosed. Also disclosed are methods for insulating and cooling a transformer using enzymatically-degummed vegetable oils, and methods for adding an enzymatically-degummed vegetable oil to an enclosure of an electrical device. Further disclosed are processes for making dielectric fluids using enzyme-degumming of vegetable oils or using enzyme-degummed vegetable oils as the starting material for the process.

First claim

What is claimed is:

1. A process for manufacturing a dielectric fluid, the process comprising:
(a) obtaining an enzymatically-degummed vegetable oil exhibiting a dielectric breakdown of less than 35 kilovolts (kV); and
(b) filtering the enzymatically-degummed vegetable oil to produce the dielectric fluid exhibiting
an IFT of at least 20 dynes/cm at 25° C.,
a Dissipation Factor of less than 0.20% at 25° C.,
an acid value (AV) of less than 0.09 milligrams KOH/gram, and
a dielectric breakdown of at least 35 kilovolts (kV).

2. The process of claim 1 , wherein the enzymatically-degummed vegetable oil obtained for step (a) is a refined, bleached and deodorized vegetable oil.

3. The process of claim 1 , wherein dielectric fluid exhibits a Dissipation Factor of less than 0.15% at 25° C.

4. The process of claim 1 , wherein the process further includes a step (c) dewatering the enzymatically-degummed vegetable oil to reduce the water content of the dielectric fluid to 200 milligrams per kilogram of oil or less.

5. The process of claim 1 , wherein the water content of the dielectric fluid is 50 milligrams per kilogram oil or less.

6. The process of claim 1 , wherein the process further includes (d) degassing the enzymatically-degummed vegetable oil.

7. The process of claim 1 , wherein the dielectric fluid exhibits a dielectric breakdown of at least 50 kilovolts (kV).

8. The process of claim 1 , wherein the dielectric fluid exhibits an acid value (AV) of 0.06 milligrams KOH/gram or less.

9. The process of claim 1 , wherein the enzyme-degummed oil of step (a) exhibits a Dissipation Factor of greater than 0.20 percent at 25° C.

10. The process of claim 1 , wherein the vegetable oil is selected from the group consisting of at least one of a rapeseed oil, a corn oil, a mustard oil, an olive oil, a palm oil, a palm kernel oil, a peanut oil, a safflower oil, a sesame oil, a soybean oil, a nut oil, a cottonseed oil, a crambe oil, a coconut oil, a meadowfoam oil, a vernonia oil, a lesquerella oil, a jatropha oil, a jojoba oil, a grape seed oil, a sunflower oil, and mixtures thereof.

11. A process for manufacturing a dielectric fluid, the process comprising:
(a) obtaining an enzymatically-degummed vegetable oil exhibiting a dielectric breakdown of less than 35 kilovolts (kV); and
(b) filtering the enzymatically-degummed vegetable oil to produce the dielectric fluid exhibiting
an IFT of at least 20 dynes/cm at 25° C.,
a Dissipation Factor of less than 0.20% at 25° C.,
an acid value (AV) of less than 0.09 milligrams KOH/gram, and
a dielectric breakdown of at least 35 kilovolts (kV),

wherein the dielectric fluid consists essentially of the enzymatically-degummed vegetable oil.

12. The process of claim 11 , wherein the dielectric fluid comprises an additive selected from the group consisting of antioxidants, pour point depressants, antimicrobial agents, dyes, and mixtures thereof.

Assignees

• Cargill Inc

Inventors

• Aufdembrink Brent
• Rapp Kevin J
• Tanger Charles M

Classifications

• C11B3/003

  by enzymes or microorganisms, living or dead · CPC title

• H01B3/20 Primary

  liquids, e.g. oils (silicone oils H01B3/46) · CPC title

• H01F27/12

  Oil cooling · CPC title

• C11B3/10

  by adsorption · CPC title