US4411768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of high boiling hydrocarbons
Assignee: Lummus Technology LLC
•
Filing: 1982-04-21
•
Granted: 1983-10-25
•
Expires: 2002-04-21
Abstract
Abstract In a hydrogenation operation employing an ebullated catalytic bed, recycle is recovered from the hydrogenated product with at least 25%, by volume, of the recycle boiling above 950° F. The recycle is cooled to a temperature of from 350° to 600° F. to separate coke precursors, prior to recycle to the hydrogenation. Higher conversion levels can be achieved by effecting recycle in such manner.
Inventors
- 👤 Harold Unger
- 👤 Morgan C. Sze
- 👤 Roger P. Van Driesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:45
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/06; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
In a process for upgrading high boiling hydrocarbon materials to valuable lower boiling materials is a hydrogenation operation including at least one expanded bed catalytic hydrogenation zone to produce an upgraded hydrogenated product, the improvement comprising: recovering from the upgraded hydrogenation product a recycle liquid having a 5-volume percent distillation temperature of at least 450° F. with at least 25-volume percent thereof boiling above 950° F.; cooling the liquid recycle to a temperature of at least 350° F. and no greater than 700° F. to separate coke precursors from the liquid recycle; and subsequent to separation of said coke precursors providing the liquid recycle to an expanded bed catalytic hydrogenation zone.
Claim 2
Dependent Claim
111 words
In a process for upgrading high boiling hydrocarbon materials to valuable lower boiling materials is a hydrogenation operation including at least one expanded bed catalytic hydrogenation zone to produce an upgraded hydrogenated product, the improvement comprising: recovering from the upgraded hydrogenation product a recycle liquid having a 5-volume percent distillation temperature of at least 450° F. with at least 25-volume percent thereof boiling above 950° F.; cooling the liquid recycle to a temperature of at least 350° F. and no greater than 700° F. to separate coke precursors from the liquid recycle; and subsequent to separation of said coke precursors providing the liquid recycle to an expanded bed catalytic hydrogenation zone.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the cooled liquid recycle is passed through a bed of particulate solids to deposit separated coke precursors on the solids.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the recycle liquid is a 600° F. + fraction.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the recycle liquid is a 1000° F. + fraction.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the recycle is cooled to a temperature of at least 400° F.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the recycle is cooled to a temperature of no greater than 600° F.
References Cited (Backward Citations)
US2715603A
Cited
US3238118A
Cited
US3839187A
Cited
US3788973A
Cited
US3844933A
Cited
US4058449A
Cited
US4252634A
Cited
US4151073A
Cited
US4176048A
Cited
US4211634A
Cited
US4214976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |