US3758532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the cooking stability of soybean oil
Assignee: Hunt Wesson Foods Inc
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Filing: 1970-09-11
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Granted: 1973-09-11
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Expires: 1990-09-11
Abstract
Abstract Unhydrogenated or partially hydrogenated refined soybean oil is degassed under vacuum to remove a substantial proportion of the air dissolved in the oil; the degassed oil is gassed with carbon dioxide and heated to a temperature above 100* C. in the presence of a copper chromite catalyst, optionally in the presence of activated charcoal. After the heat treatment the oil is cooled, filtered, bleached, and deodorized to yield the finished treated oil. The finished treated oil exhibits a frying and odor stability far surpassing soybean oil treated in any other manner.
Inventors
- 👤 W Gibble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:11
CPC Classifications
A; A23; A23D; A23D9/00; A23D9/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
20 words
The process according to claim 1 wherein the mixture contains about 0.01% to about 0.2% by weight of copper chromite.
Claim 2
Dependent Claim
19 words
The process according to claim 1 wherein the mixture is heated for a period of at least one-half hour.
Claim 3
Dependent Claim
32 words
The process according to claim 1 wherein the copper chromite contains by weight from about 7% to about 65% nonelemental copper and from about 4% to about 41% by weight nonelemental chromium.
Claim 4
Dependent Claim
21 words
The process according to claim 4 wherein the copper chromite includes by weight from about 4% to about 14% nonelemental barium.
Claim 5
Dependent Claim
20 words
The process according to claim 4 wherein the copper chromite includes by weight from about 2% to about 6% zirconium.
Claim 6
Dependent Claim
17 words
The process according to claim 1 wherein the mixture further contains a predetermined amount of activated charcoal.
Claim 7
Dependent Claim
20 words
The process according to claim 7 wherein the mixture contains about 0.01% to about 0.2% by weight of activated charcoal.
Claim 8
Dependent Claim
37 words
The process according to claim 1 including the additional steps of: degassing the filtered oil to remove a substantial portion of the carbon dioxide gas contained therein; and gassing the degassed oil with nitrogen gas before deodorization.
Claim 9
Dependent Claim
102 words
In a method of improving the flavor stability at frying temperature of unhydrogenated and partially hydrogenated refined soybean oil which comprises the steps of: degassing refined, unhydrogenated or partially hydrogenated soybean oil under vacuum conditions to remove a substantial portion of the atmospheric gases from the oil; and saturating the soybean oil with carbon dioxide gas, adding a predetermined amount of copper chromite and finely powdered activated charcoal to the oil to form a mixture, and heating the mixture in a carbon dioxide gas atmosphere at a temperature from about 90*C to about 300*C for a period of at least one-half hour.
Claim 10
Dependent Claim
28 words
The process according to claim 10 wherein the copper chromite contains by weight about 7% to about 65% nonelemental copper and about 4% to about 41% nonelemental chromium.
Claim 11
Dependent Claim
18 words
The process according to claim 11 wherein a copper chromite includes about 4% to about 14% nonelemental barium.
Claim 12
Dependent Claim
18 words
The process according to claim 10 wherein the copper chromite is powdered Girdler brand copper chromite catalyst G-22.
Claim 13
Dependent Claim
21 words
The process according to claim 13 wherein the mixture is heated to a temperature of about 250*C during the heating step.
Claim 14
Dependent Claim
61 words
The process according to claim 10 including the additional steps of: cooling the heated oil mixture to a temperature below 75* C.after the heating step; filtering the cooled oil mixture to remove the solids therefrom; degassing the filtered oil under vacuum conditions to remove a substantial portion of the carbon dioxide gas therefrom; and gassing the degassed oil with nitrogen gas.
Claim 15
Dependent Claim
45 words
The process according to claim 15 including the additional steps of: bleaching the treated oil with bleaching clay at an elevated temperature in a nitrogen gas atmosphere after gassing the degassed oil with nitrogen gas; and deodorizing the bleached oil with steam under vacuum conditions.
Claim 16
Dependent Claim
33 words
The process according to claim 10 wherein the mixture contains about 0.065% to about 0.1%, by weight, of the copper chromite and with about 0.065% to about 0.1% by weight, of the charcoal.
Claim 17
Dependent Claim
21 words
The process according to claim 17 wherein the mixture is heated to a temperature of about 250*C for about 1 hour.
Claim 18
Dependent Claim
81 words
In a method of improving the stability of unhydrogenated and partially hydrogenated refined soybean oil for frying purposes which comprises: heating carbon dioxide saturated unhydrogenated or partially hydrogenated refined soybean oil with, by weight, about 0.065% to about 0.1% of a copper chromite and about 0.065% to about 0.1% of a finely powdered activated charcoal in a carbon dioxide gas atmosphere at a temperature of about 250* C. for about 1 hour, said soybean oil being substantially free of atmospheric gases.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |