US3763018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of fouling in hydrocarbon separation
Assignee: BASF SE
•
Filing: 1972-03-23
•
Granted: 1973-10-02
•
Expires: 1992-03-23
Abstract
Abstract A process for avoiding fouling in separating hydrocarbon mixtures containing unsaturated hydrocarbons at elevated temperatures using selective solvents in the presence of antifouling agents wherein a N-substituted N-nitrosohydroxylamine of the general formula
Inventors
- 👤 P Raff
- 👤 G Ritzert
- 👤 H Weitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:16
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/20; C23; C23F; C23F14/00; C23F14/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A process as claimed in claim 1 wherein the hydrocarbon mixture used is a C4 and/or C5 hydrocarbon mixture.
Claim 2
Dependent Claim
16 words
A process as claimed in claim 1 wherein an N-alkylpyrrolidone is used as the selective solvent.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1 wherein acetonitrile, dimethylformamide, furfurol or dimethylacetamide is used as the selective solvent.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1 wherein the antifouling agent is a N-nitroso-N-cyclohexyl hydroxylamine or an alkali metal, ammonium or substituted ammonium salt thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |