US4070269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea adduction process for refrigeration oil manufacture
Assignee: Sunoco Inc R&M
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Filing: 1976-10-12
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Granted: 1978-01-24
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Expires: 1996-10-12
Abstract
Abstract In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of adding hot vacuum gas oil to the separated urea complex whereby the activator is flashed off and is recycled for reuse and the slurry of the urea complex in the gas oil is treated with hot water to break the adduct and separate a water-urea mixture and oil and paraffin. The improved method enables accurate and uniform temperature control and degradation of urea is suppressed.
Inventors
- 👤 Ronald W. Reynolds
- 👤 John D. Tice
- 👤 John S. Nutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:57
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of slurrying the separated urea complex with a vacuum gas oil at a temperature sufficient to vaporize said activator which is recycled for reuse, treating the activator-free urea complex with water in the presence of said gas oil to break said complex and separating a water-urea mixture and an oil and paraffin mixture.
Claim 2
Dependent Claim
81 words
In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of slurrying the separated urea complex with a vacuum gas oil at a temperature sufficient to vaporize said activator which is recycled for reuse, treating the activator-free urea complex with water in the presence of said gas oil to break said complex and separating a water-urea mixture and an oil and paraffin mixture.
Claim 3
Dependent Claim
99 words
In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of slurrying the separated urea complex with 1 to 4 volumes per volume of complex of a vacuum gas oil having at least a 450° F 10% distillation point at a temperature sufficient to vaporize said activator which is recycled for reuse, treating the activator-free urea complex with water in the presence of said gas oil to break said complex and separating a water-urea mixture and an oil and paraffin mixture.
Claim 4
Dependent Claim
99 words
In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of slurrying the separated urea complex with 1 to 4 volumes per volume of complex of a vacuum gas oil having at least a 450° F 10% distillation point at a temperature sufficient to vaporize said activator which is recycled for reuse, treating the activator-free urea complex with water in the presence of said gas oil to break said complex and separating a water-urea mixture and an oil and paraffin mixture.
Claim 5
Dependent Claim
10 words
The process of claim 2 where the activator is acetone.
Claim 6
Dependent Claim
22 words
The process of claim 3 where the slurry of gas oil and urea complex is at a temperature of about 200° F.
Claim 7
Dependent Claim
21 words
The process of claim 4 where each volume of separated urea complex is slurried with about 2 volumes of gas oil.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |