US4744887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid addition and withdrawal
Assignee: Lummus Technology LLC
•
Filing: 1985-12-20
•
Granted: 1988-05-17
•
Expires: 2005-12-20
Abstract
Abstract A system for adding and withdrawing solids to a high pressure reactor wherein there is provided improved control of flow and concentrations of a slurry of solids in a transport oil for introducing and withdrawing solids from the reactor. In addition, there is provided for improved heating and cooling of the solids.
Inventors
- 👤 Roger P. Van Driesen
- 👤 William R. Adams
- 👤 Mario Baldasarri
- 👤 John Caspers
- 👤 Harold Trimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:13
CPC Classifications
C; C10; C10G; C10G49/00; C10G49/10; C10G49/14; C10G49/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A process for withdrawing solids containing a reaction liquid by use of a catalyst withdrawal system, comprising: withdrawing a first stream comprising solids and a reaction liquid from a reactor; combining the first stream with a second stream comprising a transport liquid to provide a combined stream for transporting solids to a catalyst withdrawal vessel; maintaining a set flow rate for the second stream; withdrawing a mixture of reactor liquid and transport liquid from the vessel; and maintaining a rate of withdrawal of the first stream by controlling the flow rate of the mixture to maintain one of a set flow rate for the mixture or a set temperature of the combined stream or a set temperature of the mixture.
Claim 2
Dependent Claim
120 words
A process for withdrawing solids containing a reaction liquid by use of a catalyst withdrawal system, comprising: withdrawing a first stream comprising solids and a reaction liquid from a reactor; combining the first stream with a second stream comprising a transport liquid to provide a combined stream for transporting solids to a catalyst withdrawal vessel; maintaining a set flow rate for the second stream; withdrawing a mixture of reactor liquid and transport liquid from the vessel; and maintaining a rate of withdrawal of the first stream by controlling the flow rate of the mixture to maintain one of a set flow rate for the mixture or a set temperature of the combined stream or a set temperature of the mixture.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the flow rate of the mixture is controlled to maintain a set temperature for the combined stream.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the flow rate of the mixture is controlled to maintain a set temperature for the mixture.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the flow rate of the mixture is controlled to maintain a set flow rate therefor.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the solids are a hydrogenation catalyst withdrawn with reaction liquid from an expanded bed hydrogenation reactor operated at a pressure of from 500 to 4,000 psig.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the flow rate of the mixture is controlled to maintain a set temperature for the combined stream.
References Cited (Backward Citations)
US2474583A
Cited
US2605214A
Cited
US3547809A
Cited
US3849295A
Cited
US3873441A
Cited
US4018671A
Cited
US4059502A
Cited
US4576712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |