# US 9,039,945 B2 · Vegetable oil having high dielectric purity

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- Number: US 9,039,945 B2
- Document ID: US9039945B2
- Status: Granted
- Kind: B2
- Application number: 14/328,503
- Filed: 2014-07-10
- Published: 2014-10-30
- Granted: 2015-05-26
- Earliest claimed: 2011-11-16
- Assignees: Ragasa Industrias, S.A. de C.V.; Prolec Ge Internacional, S. De R.L. De C.V.
- Applicants: Ragasa Industrias, S.A. DE C.V.; Prolec-GE Internacional, S. DE R.L. DE C.V.
- Inventors: Alberto José Pulido Sanchez; Carlos Manuel Urzua Hernandez; Sergio Francisco Cazares Mendez; Jerónimo R. Villarreal Rios; José Eulalio Contreras De Leon; David Apolinar Guerra Zubiaga
- Web page: https://patentgrep.com/patent/US9039945B2

## CPC

- H01B 3/20: liquids, e.g. oils (silicone oils H01B3/46)
- C10M 101/04: Fatty oil fractions
- C10M 2207/2815: used as base material
- C10M 2207/401: used as base material
- C10N 2020/01: {Physico-chemical properties}
- C10N 2020/011: {Cloud point}
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/065: {Saturated Compounds}
- C10N 2020/067: {Unsaturated Compounds}
- C10N 2020/081: {Biodegradable compounds}
- C10N 2030/10: Inhibition of oxidation, e.g. anti-oxidants
- C10N 2030/40: {Low content or no content compositions}
- C10N 2030/62: {Food grade properties}
- C10N 2040/16: Dielectric; Insulating oil {or insulators}
- C10N 2070/00: Specific manufacturing methods for lubricant compositions
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A dielectric high purity vegetable oil—free from antioxidants and/or external additives to be used in electric equipment such as transformers, as isolating element and as cooling means and a method for obtaining the same in which the dielectric high purity vegetable oil—is obtained by means of the optimization of the bleaching steps—and deodorizing—from the Refining process—known as Modified Caustic Refining Long-Mix (RBD).

## Claims

### Claim 1

A dielectric fluid being free of synthetic additives and comprising a high purity vegetable oil, comprising:
from 17.7% to 28.5% by weight of a mono-unsaturated fatty acid;
from 49.8% to 57.1% by weight of a di-unsaturated fatty acid;
from 5.5% to 9.5% by weight of a tri-unsaturated fatty acid; and
from 12.7% to 18.7% by weight of a saturated fatty acid.

### Claim 2 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil is soybean oil.

### Claim 3 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has a dielectric strength of from 50 kV to 60 kV at separation of 2 mm.

### Claim 4 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has a dissipation factor of 0.08% to 0.15% at 25° C.

### Claim 5 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has:
a pouring point of −21° C. to −10° C.;
a kinematic viscosity less than 35 cST a 40° C. and less to 7 cST at 100° C.;
0.0 meq/kg of peroxide index;
a flammable temperature of at least 330° C.;
an ignition temperature of at least 350° C.; and
an acid number of 0.02 to 0.06 mg KOH/g.

### Claim 6 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has a pouring point of −15° C. to −10° C.

### Claim 7 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has:
less than 0.03% by weight of free fatty acids;
0 ppm of soap;
less than 8 ppm of phosphorus, calcium, magnesium, copper, iron, and sodium;
less than 5 ppb of chlorophyll “a”; and
less than 200 ppm of moisture.

### Claim 8 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has:
less than 3 ppm of phosphorus;
less than 1 ppm of calcium;
less than 1 ppm of magnesium;
less than 1 ppm of copper;
less than 1 ppm of iron; and
less than 1 ppm of sodium.

### Claim 9 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has a stability to oxidation with sludge generation between 70% to 80% as determined by ASTM D 2440.

### Claim 10 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has:
0.0 meq/kg of peroxide value;
less than 1% by weight of polar components; and
less than 0.4% by weight of conjugated dienes.

### Claim 11 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has a refraction index of 1.466 to 1.488.

### Claim 12 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil has:
a dielectric strength of 50 kV to 80 kV at a separation of 2 mm;
a dielectric constant of less than 2.6 at 25° C.; and
a dissipation factor of 0.05% to 0.2% at 25° C.

### Claim 13 (depends on 1)

The dielectric fluid of claim 1, wherein the high purity vegetable oil comprises:
from 17.7% to 28.5% by weight of oleic acid;
from 49.8% to 57.1% by weight of linoleic acid;
from 5.5% to 9.5% by weight of linolenic acid;
from 9.7% to 13.3% by weight of palmitic acid; and
from 3.0% to 5.4% by weight of stearic acid.